Consumer medicine information

Verapamil Mylan

Verapamil hydrochloride

BRAND INFORMATION

Brand name

Verapamil Mylan

Active ingredient

Verapamil hydrochloride

Schedule

S4

 

Consumer medicine information (CMI) leaflet

Please read this leaflet carefully before you start using Verapamil Mylan.

What is in this leaflet

This leaflet answers some common questions about Verapamil Mylan.

It does not contain all the available information. It does not take the place of talking to your doctor or pharmacist.

All medicines have benefits and risks. Your doctor has weighed the risks of you taking Verapamil Mylan against the benefits expected for you.

If you have any concerns about taking this medicine, talk to your doctor or pharmacist.

Keep this leaflet with your medicine. You may need to read it again.

What Verapamil Mylan is used for

Verapamil Mylan tablets are used to treat:

  • high blood pressure, also called hypertension
  • angina (chest pain)
  • some types of arrhythmias (irregular heartbeats).

Verapamil Mylan belongs to a group of medicines called calcium antagonists or calcium channel blockers. These medicines work by opening up blood vessels, causing blood pressure to fall and letting more blood and oxygen reach the heart. Calcium channel blockers also help control an irregular heartbeat.

Verapamil Mylan does not change the amount of calcium in your blood or bones. Calcium in your diet or in calcium supplements will not interfere with the way Verapamil Mylan works.

Ask your doctor if you have any questions about why this medicine has been prescribed for you. Your doctor may have prescribed it for another reason.

This medicine is available only with a doctor's prescription.

Before you take Verapamil Mylan

When you must not take it

Do not take Verapamil Mylan if you have an allergy to:

  • medicines containing verapamil hydrochloride
  • any of the ingredients listed at the end of this leaflet.

Some of the symptoms of an allergic reaction may include:

  • Shortness of breath
  • Wheezing or difficulty breathing
  • Swelling of the face, lips, tongue or other parts of the body
  • Rash, itching or hives on the skin

Do not take this medicine if you have:

  • low blood pressure (hypotension)
  • certain other heart conditions (such as heart failure, a very slow heart rate, some irregular heartbeats or disease of the heart muscle)
  • are taking any of the following medicines or medications containing these ingredients
    - ivabradine
    - dabigatran (in certain situations)

Do not take this medicine after the expiry date (EXP) printed on the bottle or if the bottle shows signs of tampering. If it has expired or is damaged, return it to your pharmacist for disposal.

If you are not sure whether you should start taking this medicine, talk to your doctor.

Before you start to take it

Tell your doctor if you have allergies to any other medicines, foods, dyes or preservatives.

Tell your doctor if you are pregnant or plan to become pregnant. Verapamil Mylan may harm your developing baby. Your doctor will discuss the risks and benefits of taking Verapamil Mylan during pregnancy.

Tell your doctor if you are breastfeeding or wish to breastfeed. Verapamil Mylan passes into breast milk. Your doctor will discuss the risks and benefits of taking Verapamil Mylan when breastfeeding.

Tell your doctor if you have, or have had, any of the following medical conditions:

  • any other heart problem
  • blood vessel (circulatory) disease or a stroke
  • liver problems
  • kidney problems
  • muscle conditions such as myasthenia gravis, Lambert-Eaton syndrome, and Duchenne's muscular dystrophy.

Your doctor may want to take special care if you have any of these conditions.

Tell your doctor if you plan to have surgery.

If you have not told your doctor about any of the above, tell him/her before you start taking Verapamil Mylan.

Taking other medicines

Tell your doctor or pharmacist if you are taking any other medicines, including any that you buy without a prescription from a pharmacy, supermarket or health food shop.

Some medicines and Verapamil Mylan may interfere with each other. These include:

  • beta blockers (eg. atenolol, metoprolol, propranolol)
  • ivabradine
  • fluid tablets, also called diuretics
  • any other medicines used to control an irregular heartbeat e.g. digoxin, quinidine, flecainide, amiodarone, disopyramide
  • medicines used to treat high blood pressure (especially prazosin or terazosin)
  • medicines used to lower cholesterol, such as atorvastatin or simvastatin
  • medicines used to treat psychological problems, such as imipramine, buspirone, midazolam or lithium
  • medicines used to treat epilepsy or seizures, such as phenytoin, carbamazepine and phenobarbitone
  • medicines used to treat or prevent organ transplant rejection, such as cyclosporine, everolimus, sirolimus and tacrolimus
  • medicines used to treat infections or tuberculosis, such as erythromycin, clarithromycin, telithromycin or rifampicin
  • medicines used in the treatment of Human Immunodeficiency Virus (HIV), such as ritonavir
  • medicines used to treat or prevent gout, such as colchicine or sulfinpyrazone
  • medicines used in surgical procedures such as general anaesthetics used for inducing sleep, muscle relaxants
  • theophylline, a medicine used to treat asthma
  • doxorubicin, a medicine used to treat certain cancers
  • cimetidine, a medicine commonly used to treat stomach ulcers and reflux
  • glibenclamide, a medicine used to treat diabetes
  • dabigatran, aspirin, blood thinning medicine also used for pain relief

Avoid alcohol while using Verapamil Mylan. You may experience greater blood pressure lowering effects than usual.

Avoid grapefruit juice, as this may increase the blood levels of verapamil.

These medicines may be affected by Verapamil Mylan or may affect how well it works. You may need different amounts of your medicines, or you may need to take different medicines.

Your doctor and pharmacist have more information on medicines to be careful with or avoid while taking this medicine.

How to take Verapamil Mylan

Follow all directions given to you by your doctor and pharmacist carefully. They may differ from the information contained in this leaflet.

If you do not understand the instructions on the bottle, ask your doctor or pharmacist.

How much to take

The dose varies from person to person.

Your doctor will tell you how many tablets you need to take each day and when to take them. This depends on the condition being treated and whether or not you are taking any other medicines.

People with liver problems may need smaller doses.

How to take it

Swallow the tablets with a glass of water.

Verapamil Mylan tablets can be divided in half along the breakline, if your doctor has prescribed half a tablet.

When to take it

Verapamil Mylan tablets are usually taken two or three times a day, space the tablets evenly apart throughout the day.

Taking it at the same time each day will have the best effect. It will also help you remember when to take it.

It does not matter if you take this medicine before or after food.

How long to take it

Verapamil Mylan is usually taken as long-term treatment.

Continue taking your medicine for as long as your doctor tells you to.

This medicine helps to control your condition, but does not cure it. It is important to keep taking your medicine even if you feel well.

If you forget to take it

If it is almost time for your next dose, skip the dose you missed and take your next dose when you are meant to.

Otherwise, take it as soon as you remember, and then go back to taking your medicine as you would normally.

Do not take a double dose to make up for the dose you missed. This may increase the chance of you getting an unwanted side effect.

If you are not sure what to do, ask your doctor or pharmacist.

If you have trouble remembering to take your medicine, ask your pharmacist for some hints.

If you take too much (overdose)

Immediately telephone your doctor, or the Poisons Information Centre (telephone 13 11 26) for advice, or go to Accident and Emergency at the nearest hospital, if you think you or anyone else may have taken too much Verapamil Mylan. Do this even if there are no signs of discomfort or poisoning. You may need urgent medical attention.

If you take too much Verapamil Mylan, you may develop a slow heartbeat, experience chest pain, feel very faint or collapse.

While you are taking Verapamil Mylan

Things you must do

If you become pregnant while taking Verapamil Mylan, tell your doctor immediately.

Tell your doctor if you continue to have chest pain or if it becomes more frequent while you are taking Verapamil Mylan.

Before starting any new medicine, tell your doctor or pharmacist that you are taking Verapamil Mylan.

Tell all the doctors, dentists and pharmacists who are treating you that you are taking Verapamil Mylan.

If you plan to have surgery, including dental surgery, tell your surgeon, anaesthetist or dentist that you are taking Verapamil Mylan.

Visit your doctor regularly so they can check on your progress. Your doctor may ask you to have blood tests to check your liver from time to time.

Things you must not do

Do not eat grapefruit or drink grapefruit juice while you are being treated with Verapamil Mylan. Grapefruit can affect Verapamil Mylan levels in the body. This may increase the chance of getting unwanted side effects.

Do not stop taking Verapamil Mylan, or change the dose, without checking with your doctor.

Do not let yourself run out of Verapamil Mylan over weekends or holidays.

Do not use Verapamil Mylan to treat any other conditions unless your doctor tells you to.

Do not give this medicine to anyone else, even if they have the same condition as you.

Things to be careful of

Be careful getting up from a sitting or lying position. Dizziness, lightheadedness or fainting may occur, especially when you get up quickly. Getting up slowly may help.

Make sure you know how Verapamil Mylan affects you before you drive a car, operate machinery, or do anything else that could be dangerous. Verapamil Mylan may cause tiredness, dizziness or lightheadedness in some people, especially when they first start taking the medicine or the dose is changed.

Be careful drinking alcohol while taking Verapamil Mylan. Combining alcohol with Verapamil Mylan may make you more drowsy, dizzy or lightheaded. Your doctor may suggest you avoid alcohol while you are taking Verapamil Mylan.

Lifestyle measures that help reduce heart disease risk

By following these simple measures, you can further reduce the risk from heart disease.

  • Quit smoking and avoid second-hand smoke.
  • Limit alcohol intake.
  • Enjoy healthy eating by:
    - eating plenty of vegetables and fruit;
    - reducing your saturated fat intake (eat less fatty meats, full fat dairy products, butter, coconut and palm oils, most take-away foods, commercially-baked products).
  • Be active. Progress, over time, to at least 30 minutes of moderate-intensity physical activity on 5 or more days each week. Can be accumulated in shorter bouts of 10 minutes duration. If you have been prescribed anti-angina medicine, carry it with you when being physically active.
  • Maintain a healthy weight.
  • Discuss your lifestyle and lifestyle plans with your doctor.
  • For more information and tools to improve your heart health, call Heartline, the Heart Foundation's national telephone information service, on 1300 36 27 87 (local call cost).

Know warning signs of heart attack and what to do:

  • Tightness, fullness, pressure, squeezing, heaviness or pain in your chest, neck, jaw, throat, shoulders, arms or back.
  • You may also have difficulty breathing, or have a cold sweat or feel dizzy or light headed or feel like vomiting (or actually vomit).
  • If you have heart attack warning signs that are severe, get worse or last for 10 minutes even if they are mild, call triple zero (000). Every minute counts.

Side effects

Tell your doctor or pharmacist as soon as possible if you do not feel well while you are taking Verapamil Mylan.

Verapamil Mylan helps most people and is usually well tolerated, but may have unwanted side effects in some people.

All medicines can have side effects. Sometimes they are serious, most of the time they are not. You may need medical treatment if you get some of the side effects.

If you are over 65 years of age, you may have an increased chance of getting side effects.

Do not be alarmed by this list of possible side effects. You may not experience any of them.

Ask your doctor or pharmacist to answer any questions you may have.

Tell your doctor if you notice any of the following and they worry you:

  • constipation
  • dizziness or lightheadedness
  • feeling sick (nausea)
  • upset stomach
  • headache
  • tiredness
  • flushing.

The above list includes the milder and more common side effects of Verapamil Mylan.

Tell your doctor immediately or go to Accident and Emergency at the nearest hospital if you notice any of the following:

  • chest pain, fainting, collapse
  • slow, fast, or irregular heart beat
  • shortness of breath (sometimes with tiredness, weakness and reduced ability to exercise), which may occur together with swelling of the feet or legs due to fluid build up
  • fever, upper stomach pain, feeling generally unwell
  • severe blisters, skin rash, itching or flaking skin.

The above list includes very serious side effects. You may need urgent medical attention or hospitalisation.

Tell your doctor if you notice anything that is making you feel unwell.

This is not a complete list of all possible side effects.

Other side effects not listed above may also occur in some people.

After taking Verapamil Mylan

Storage

Keep your tablets in the bottle until it is time to take them. If you take the tablets out of the bottle they may not keep well.

Keep your tablets in a cool dry place where the temperature stays below 30°C.

Do not store Verapamil Mylan or any other medicine in the bathroom or near a sink. Do not leave it on a window sill or in the car. Heat and dampness can destroy some medicines.

Keep it where children cannot reach it. A locked cupboard at least one-and-a-half metres above the ground is a good place to store medicines.

Disposal

If your doctor tells you to stop taking this medicine, or the expiry date has passed, ask your pharmacist what to do with any that are left over.

Product description

What it looks like

Verapamil Mylan is available as:

  • Verapamil Mylan 40 -yellow, round, scored, film-coated tablet marked "VL/40" on one side and "G" on the other, bottles of 100 tablets
  • Verapamil Mylan 80 - yellow-orange, round, scored, film-coated tablet marked "VL/80" on one side and "G" on the other, bottles of 100 tablets

Ingredients

The active ingredient in Verapamil Mylan is verapamil hydrochloride.

Each tablet of:

  • Verapamil Mylan 40 contains 40 mg of verapamil hydrochloride
  • Verapamil Mylan 80 contains 80 mg of verapamil hydrochloride

It also contains the following inactive ingredients:

  • lactose anhydrous
  • microcrystalline cellulose
  • pregelatinised maize starch
  • sodium starch glycollate
  • purified talc
  • magnesium stearate
  • hypromellose
  • macrogol 400
  • titanium dioxide CI77891 (E171)
  • quinoline yellow CI47005 (E104)
  • sunset yellow FCF CI15985 (E110)
  • indigo carmine CI73015 (E132).

Verapamil Mylan tablets are gluten free.

Supplier

Verapamil Mylan is supplied by:

Alphapharm Pty Limited
(ABN 93 002 359 739)
Level 1, 30 The Bond
30-34 Hickson Road
Millers Point NSW 2000
Phone: (02) 9298 3999
www.mylan.com.au

Australian registration numbers:

Verapamil Mylan 40 - AUST R 80443

Verapamil Mylan 80 - AUST R 80444

This leaflet was prepared in June 2019.

Verapamil Mylan_cmi\Jun19/00

Published by MIMS January 2020

BRAND INFORMATION

Brand name

Verapamil Mylan

Active ingredient

Verapamil hydrochloride

Schedule

S4

 

1 Name of Medicine

Verapamil hydrochloride.

6.7 Physicochemical Properties

Molecular formula: C27H38N2O4.HCl. Molecular weight: 491.1.

Chemical structure.


CAS number.

152-11-4.
Verapamil is soluble in 20 parts of water; sparingly soluble in ethanol (96%), freely soluble in chloroform and practically insoluble in ether.

2 Qualitative and Quantitative Composition

Verapamil hydrochloride is a calcium ion influx inhibitor (slow channel blocker or calcium ion antagonist).
Each tablet contains 40 mg or 80 mg of verapamil hydrochloride as the active ingredient.

Excipients with known effect.

Sugars (as lactose).
For the full list of excipients, see Section 6.1 List of Excipients.

3 Pharmaceutical Form

Verapamil hydrochloride is a white or almost white, odourless, crystalline powder.
Verapamil Mylan 40 mg is available as a pale yellow, film coated tablet, marked "VL/40" on one side, "G" on the other.
Verapamil Mylan 80 mg tablet is available as a orange/yellow, film coated tablet, marked "VL/80" on one side, "G" on the other.

5 Pharmacological Properties

5.1 Pharmacodynamic Properties

Mechanism of action.

Verapamil is a calcium ion influx inhibitor (slow channel blocker or calcium ion antagonist) which exerts its pharmacologic effects by modulating the influx of ionic calcium ions across cell membranes of the arterial smooth muscle cell as well as in conductile and contractile myocardial cells.

Hypertension.

Verapamil exerts antihypertensive effects by decreasing systemic vascular resistance, usually without orthostatic decreases in blood pressure or reflex tachycardia; bradycardia (rate less than 50 beats/min) is uncommon (1.4%). During isometric or dynamic exercise verapamil does not alter systolic cardiac function in patients with normal ventricular function.

Angina pectoris.

Verapamil dilates the main coronary arteries and coronary arterioles, both in normal and ischaemic regions and is a potent inhibitor of coronary artery spasm, whether spontaneous or ergonovine induced. This property increases myocardial oxygen delivery in patients with coronary artery spasm, and is responsible for the effectiveness of verapamil in vasospastic (Prinzmetal's or variant) as well as unstable angina at rest. Whether this effect plays any role in classical effort angina is not clear, but studies of exercise tolerance have not shown an increase in the maximum exercise rate pressure product, a widely accepted measure of oxygen utilisation. This suggests that, in general, relief of spasm or dilation of coronary arteries is not an important factor in classical angina.
Verapamil regularly reduces the total systemic resistance (afterload) against which the heart works both at rest and at a given level of exercise by dilating peripheral arterioles.
Verapamil does not alter total serum calcium levels. However, one report suggested that calcium levels above the normal range may alter the therapeutic effect of verapamil.

Other pharmacological actions.

Electrical activity through the A-V node depends, to a significant degree, upon calcium influx through the slow channel. By decreasing the influx of calcium, verapamil prolongs the effective refractory period within the A-V node and slows A-V conduction in a rate related manner. Normal sinus rhythm is usually not affected, but in patients with sick sinus syndrome, verapamil may interfere with sinus node impulse generation and may induce sinus arrest or sinoatrial block. Atrioventricular block can occur in patients without pre-existing conduction defects (see Section 4.4 Special Warnings and Precautions for Use).
Verapamil does not alter the normal atrial action potential or intraventricular conduction time, but depresses amplitude, velocity of depolarisation and conduction in depressed atrial fibres. Verapamil may shorten the antegrade effective refractory period of accessory bypass tracts. Acceleration of ventricular rate and/or ventricular fibrillation has been reported in patients with atrial flutter or atrial fibrillation and a coexisting accessory A-V pathway following administration of verapamil (see Section 4.4 Special Warnings and Precautions for Use).
Verapamil has a local anaesthetic action that is 1.6 times that of procaine on an equimolar basis. It is not known whether this action is important at the doses used in humans.

Clinical trials.

The following reactions to orally administered verapamil occurred at rates greater than 1.0% or occurred at lower rates but appeared clearly drug related in clinical trials in 4,954 patients. See Table 1.
In clinical trials related to the control of ventricular response in digitalised patients who had atrial fibrillation or flutter, ventricular rate below 50 at rest occurred in 15% of patients and asymptomatic hypotension occurred in 5% of patients. See Section 4.8 Adverse Effects (Undesirable Effects).

Hypotension.

The incidence of hypotension observed in 4954 patients enrolled in clinical trials was 2.5%. In hypertensive patients, decreases in blood pressure below normal are unusual. Tilt table testing (60 degrees) was not able to induce orthostatic hypotension. See Section 4.4 Special Warnings and Precautions for Use.

5.2 Pharmacokinetic Properties

Verapamil hydrochloride is rapidly and almost completely absorbed from the gastrointestinal tract. The overall oral bioavailability ranges from 22 to 35% due to a substantial hepatic first-pass effect. Peak plasma concentrations are reached between one and two hours after oral administration. Chronic oral administration of 120 mg of verapamil every 6 hours resulted in plasma levels of verapamil ranging from 125 to 400 nanogram/mL with higher values reported occasionally. A nonlinear correlation between the verapamil dose administered and verapamil plasma levels does exist.
In early dose titration with verapamil, a relationship exists between verapamil plasma concentrations and the prolongation of the PR interval. However, during chronic administration this relationship may disappear. The mean elimination half-life in single dose studies ranged from 2.8 to 7.4 hours. In these same studies, after repetitive dosing the half-life increased to a range from 4.5 to 12.0 hours (after less than ten consecutive doses given 6 hours apart). Half-life of verapamil may increase during titration.
Aging may affect the pharmacokinetics of verapamil. Elimination half-life may be prolonged in the elderly.
In healthy subjects, orally administered verapamil undergoes extensive metabolism in the liver. Twelve metabolites have been identified in plasma. Norverapamil can reach steady-state plasma concentrations approximately equal to those of verapamil itself. The cardiovascular activity of norverapamil appears to be approximately 20% that of verapamil. Approximately 70% of an administered dose is excreted as metabolites in the urine and 16% or more in the faeces within five days. About 3% to 4% is excreted in the urine as unchanged drug. Approximately 90% is bound to plasma proteins.
In patients with hepatic insufficiency, metabolism of immediate release verapamil is delayed and elimination half-life prolonged up to 14 to 16 hours (see Section 4.4 Special Warnings and Precautions for Use); the volume of distribution is increased and plasma clearance reduced to about 30% of normal. Verapamil clearance values suggest that patients with liver dysfunction may attain therapeutic verapamil plasma concentrations with one-third of the oral daily dose required for patients with normal liver function.
Impaired renal function has no effect on verapamil hydrochloride pharmacokinetics in patients with endstage renal failure and subjects with healthy kidneys.
After four weeks of oral dosing (120 mg four times daily), verapamil and norverapamil levels were noted in the cerebrospinal fluid. Estimated partition coefficient of 0.06 for verapamil and 0.04 for norverapamil.

Haemodynamics and myocardial metabolism.

Verapamil reduces afterload and myocardial contractility. Improved left ventricular diastolic function in patients with hypertrophic cardiomyopathy (IHSS) and those with coronary heart disease has also been observed with verapamil therapy. In most patients, including those with organic cardiac disease, the negative inotropic action of verapamil is countered by reduction of afterload and cardiac index is usually not reduced. In patients with severe left ventricular dysfunction however, (e.g. pulmonary wedge pressure above 20 mmHg or ejection fraction lower than 30%) or in patients on beta-adrenergic blocking agents or other cardiodepressant drugs, deterioration of ventricular function may occur (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).

Pulmonary function.

Verapamil does not induce bronchoconstriction and hence, does not impair ventilatory function.

5.3 Preclinical Safety Data

Genotoxicity.

Verapamil was not mutagenic in the Ames test in 5 test strains at 3 mg per plate, with or without metabolic activation.

Carcinogenicity.

An 18 month toxicity study in rats, at a low multiple (6-fold) of the maximum recommended human dose, and not the maximum tolerated dose, did not suggest a tumorigenic potential. There was no evidence of a carcinogenic potential of verapamil administered in the diet of rats for two years at doses of 10, 35 and 120 mg/kg/day or approximately 1x, 3.5x and 12x, respectively, the maximum recommended human daily dose (480 mg/day or 9.6 mg/kg/day).

Animal pharmacology and/or animal toxicology.

In chronic animal toxicology studies, verapamil caused lenticular and/or suture line changes at 30 mg/kg/day or greater and frank cataracts at 62.5 mg/kg/day or greater in the beagle dog but not the rat.
Development of cataracts due to verapamil has not been reported in humans.

4 Clinical Particulars

4.1 Therapeutic Indications

Hypertension; angina of effort; angina at rest; vasospastic angina (including Prinzmetal's variant angina); tachyarrhythmias including paroxysmal supraventricular tachycardia; atrial fibrillation and atrial flutter with rapid ventricular response.

4.3 Contraindications

Verapamil HCl is contraindicated in the following.
Severe left ventricular dysfunction (see Section 4.4 Special Warnings and Precautions for Use).
Hypotension (systolic pressure less than 90 mmHg) or cardiogenic shock.
Sick sinus syndrome (except in patients with a functioning artificial ventricular pacemaker).
Second or third degree A-V block (except in patients with a functioning artificial ventricular pacemaker).
Patients with atrial flutter or atrial fibrillation and an accessory bypass tract (e.g. Wolff-Parkinson-White, Lown-Ganong-Levine syndromes) (see Section 4.4 Special Warnings and Precautions for Use). These patients are at risk to develop ventricular tachyarrhythmia including ventricular fibrillation if verapamil hydrochloride is administered.
Heart failure with reduced ejection fraction of less than 35%, and/or pulmonary wedge pressure above 20 mmHg.
Patients concomitantly administered ivabradine (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Simultaneous initiation of treatment with dabigatran etexilate and oral verapamil (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Treatment initiation with oral verapamil in patients following major orthopaedic surgery who are already treated with dabigatran etexilate (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Patients with known hypersensitivity to verapamil hydrochloride or any of the inactive ingredients.

4.4 Special Warnings and Precautions for Use

Heart failure.

Verapamil has a negative inotropic effect which, in most patients, is compensated by its afterload reduction (decreased systemic vascular resistance) properties without a net impairment of ventricular performance. In clinical experience with 4954 patients, 87 (1.8%) developed congestive heart failure or pulmonary oedema. Verapamil should be avoided in patients with severe left ventricular dysfunction (e.g. ejection fraction less than 30%, pulmonary wedge pressure above 20 mmHg or severe symptoms of cardiac failure) and in patients with any degree of ventricular dysfunction if they are receiving a beta-adrenergic blocker (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Patients with milder ventricular dysfunction should, if possible, be controlled with optimum doses of digitalis and/or diuretics before verapamil treatment (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions, Digitalis).

Acute myocardial infarction.

Use with caution in patients with acute myocardial infarction complicated by bradycardia, marked hypotension, or left ventricular dysfunction.

Hypotension.

Occasionally, the pharmacologic action of verapamil may produce a decrease in blood pressure below normal levels, which may result in dizziness or symptomatic hypotension. See Section 5.1 Pharmacodynamic Properties, Clinical trials.

Elevated liver enzymes.

Elevations of transaminases with and without concomitant elevations in alkaline phosphatase and bilirubin have been reported. Such elevations have sometimes been transient and may disappear even with continued verapamil treatment. Several cases of hepatocellular injury related to verapamil have been proven by rechallenge. Half of these had clinical symptoms (malaise, fever, and/or right upper quadrant pain) in addition to elevations of SGOT, SGPT and alkaline phosphatase. Periodic monitoring of liver function in patients receiving verapamil is therefore prudent.

Accessory bypass tract (Wolff-Parkinson-White or Lown-Ganong-Levine).

Some patients with paroxysmal and/or chronic atrial fibrillation or atrial flutter and a coexisting accessory A-V pathway have developed increased antegrade conduction across the accessory pathway bypassing the A-V node, producing a very rapid ventricular response or ventricular fibrillation after receiving intravenous verapamil (or digitalis). Although a risk of this occurring with oral verapamil has not been established, such patients receiving oral verapamil may be at risk and its use in these patients is contraindicated (see Section 4.3 Contraindications).
Treatment is usually DC-cardioversion. Cardioversion has been used safely and effectively after oral verapamil.

Atrioventricular block.

Verapamil affects the A-V and S-A nodes and prolongs A-V conduction time. Use with caution as development of second or third degree A-V block (see Section 4.3 Contraindications) or unifascicular, bifascicular or trifascicular bundle branch block requires discontinuation in subsequent doses of verapamil hydrochloride and institution of appropriate therapy, if needed.
Verapamil hydrochloride affects the A-V and S-A nodes and may produce second or third degree A-V block, bradycardia, and, in extreme cases, asystole. This is more likely to occur in patients with a sick sinus syndrome (S-A nodal disease), which is more common in older patients.
Asystole in patients other than those with sick sinus syndrome is usually of short duration (few seconds or less), with spontaneous return to A-V nodal or normal sinus rhythm. If this does not occur promptly, appropriate treatment should be initiated immediately.
The effect of verapamil on A-V conduction and the S-A node may cause asymptomatic first degree A-V block and transient bradycardia, sometimes accompanied by nodal escape rhythms. PR interval prolongation is correlated with verapamil plasma concentrations, especially during the early titration phase of therapy. Higher degrees of A-V block, however, were infrequently (0.8%) observed. Marked first degree block or progressive development to second or third degree A-V block requires a reduction in dosage or, in rare instances, discontinuation of verapamil and institution of appropriate therapy depending upon the clinical situation.

Patients with hypertrophic cardiomyopathy (IHSS).

In 120 patients with hypertrophic cardiomyopathy (most of them refractory or intolerant to propranolol) who received therapy with verapamil at doses up to 720 mg/day, a variety of serious adverse effects were seen. Three patients died in pulmonary oedema; all had severe left ventricular outflow obstruction and a past history of left ventricular dysfunction. Eight other patients had pulmonary oedema and/or severe hypotension; abnormally high (over 20 mmHg) capillary wedge pressure and a marked left ventricular outflow obstruction were present in most of these patients.
Concomitant administration of quinidine (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions) preceded the severe hypotension in 3 of the 8 patients (2 of whom developed pulmonary oedema). Sinus bradycardia occurred in 11% of the patients, second degree A-V block in 4% and sinus arrest in 2%. It must be appreciated that this group of patients had a serious disease with a high mortality rate. Most adverse effects responded well to dose reduction and only rarely did verapamil have to be discontinued.

Use in patients with impaired neuromuscular transmission.

Verapamil should be used with caution in the presence of diseases in which neuromuscular transmission is affected (myasthenia gravis, Lambert-Eaton syndrome, advanced Duchenne muscular dystrophy).
It has been reported that verapamil decreases neuromuscular transmission in patients with Duchenne's muscular dystrophy, and that verapamil prolongs recovery from the neuromuscular blocking agent vecuronium. It may be necessary to decrease the dosage of verapamil when it is administered to patients with attenuated neuromuscular transmission.

Use in hepatic impairment.

Since verapamil is highly metabolised by the liver, it should be administered cautiously to patients with impaired hepatic function. Severe liver dysfunction prolongs the elimination half-life of verapamil to about 14 to 16 hours; hence, approximately 30% of the dose given to patients with normal liver function should be administered to these patients. Careful monitoring for abnormal prolongation of the PR interval or other signs of excessive pharmacologic effects (see Section 4.9 Overdose) should be carried out.

Use in renal impairment.

About 70% of an administered dose of verapamil is excreted as metabolites in the urine. Although impaired renal function has been shown to have no effect on verapamil pharmacokinetics in patients with endstage renal failure, verapamil should be administered cautiously and with close monitoring in patients with impaired renal function. These patients should be carefully monitored for abnormal prolongation of the PR interval or other signs of overdosage (see Section 4.9 Overdose). Verapamil is not removed by haemodialysis.

Use in the elderly.

See Section 4.2 Dose and Method of Administration; Section 5.2 Pharmacokinetic Properties.

Paediatric use.

See Section 4.2 Dose and Method of Administration.

Effects on laboratory tests.

No data available.

4.5 Interactions with Other Medicines and Other Forms of Interactions

In vitro metabolic studies indicate that verapamil hydrochloride is metabolised by cytochrome P450 CYP3A4, CYP1A2, CYP2C8, CYP2C9 and CYP2C18. Verapamil has been shown to be an inhibitor of CYP3A4 enzymes and P-glycoprotein (P-gp). Clinically significant interactions have been reported with inhibitors of CYP3A4 causing elevation of plasma levels of verapamil while inducers of CYP3A4 have caused a lowering of plasma levels of verapamil, therefore, patients should be monitored for drug interactions.

Beta-blockers.

Concomitant therapy with beta-adrenergic blockers and verapamil may result in additive negative effects on heart rate, atrioventricular conduction and/or cardiac contractility.
Asymptomatic bradycardia (36 beats/min) with a wandering atrial pacemaker has been observed in a patient receiving concomitant timolol (a beta-adrenergic blocker) eye drops and oral verapamil.
Atenolol, metoprolol and propranolol plasma levels may be increased by concomitant administration of verapamil.

Ivabradine.

Concomitant administration of verapamil and ivabradine is contraindicated. Ivabradine use in combination with verapamil is associated with increased plasma concentrations of ivabradine and additional heart rate lowering effects (see Section 4.3 Contraindications).

Digitalis.

Clinical use of verapamil in digitalised patients has shown the combination to be well tolerated if digoxin doses are properly adjusted. Chronic verapamil treatment can increase serum digoxin levels by 50 to 75% during the first week of therapy, and this can result in digitalis toxicity. In patients with hepatic cirrhosis, the influence of verapamil on digoxin kinetics is magnified. Verapamil may reduce total body clearance and extrarenal clearance of digitoxin by 27% and 29%, respectively. Maintenance digitalis doses should be reduced when verapamil is administered and the patient should be carefully monitored to avoid over or underdigitalisation. Whenever overdigitalisation is suspected, the daily dose of digitalis should be reduced or temporarily discontinued. Upon discontinuation of Verapamil Mylan, the patient should be reassessed to avoid underdigitalisation. In clinical trials related to the control of ventricular response in digitalised patients who had atrial fibrillation or atrial flutter, ventricular rates below 50/min at rest occurred in 15% of patients and asymptomatic hypotension occurred in 5% of patients.

Antihypertensive agents.

Verapamil administered concomitantly with oral antihypertensive agents (e.g. vasodilators, angiotensin converting enzyme inhibitors, diuretics, beta-blockers) will usually have an additive effect on lowering blood pressure. Patients receiving these combinations should be appropriately monitored. Concomitant use of agents that attenuate alpha-adrenergic function with verapamil may result in a reduction in blood pressure that is excessive in some patients. Such an effect was observed in one study following the concomitant administration of verapamil and prazosin.

Antiarrhythmic agents.

When combined with antiarrhythmic drugs (e.g. disopyramide, flecainide, mexiletine, amiodarone) additive (depressant) effects on myocardial contractility and A-V conduction may occur.
In a small number of patients with hypertrophic cardiomyopathy (IHSS), concomitant use of verapamil and quinidine resulted in significant hypotension. Until further data are obtained, combined therapy of verapamil and quinidine in patients with hypertrophic cardiomyopathy should probably be avoided.
The electrophysiological effects of quinidine and verapamil on A-V conduction were studied in 8 patients. Verapamil significantly counteracted the effects of quinidine on A-V conduction. There has been a report of increased quinidine levels during verapamil therapy.

Nitrates.

Verapamil has been given concomitantly with short and long acting nitrates without any undesirable drug interactions. The pharmacologic profile of both drugs and clinical experience suggest beneficial interactions.

Cimetidine.

The interaction between cimetidine and chronically administered verapamil has not been studied. Variable results on clearance have been obtained in acute studies of healthy volunteers; clearance of verapamil was either reduced or unchanged.

Lithium.

Increased sensitivity to the effects of lithium (neurotoxicity) has been reported during concomitant verapamil lithium therapy with either no change or an increase in serum lithium levels. However, the addition of verapamil has also resulted in the lowering of serum lithium levels in patients receiving chronic stable oral lithium. Patients receiving both drugs must be monitored carefully.

Prazosin, terazosin.

Additive hypotensive effect.

HIV antiviral agents.

Due to the metabolic inhibitory potential of some of the HIV antiviral agents, such as ritonavir, plasma concentrations of verapamil may increase. Caution should be used or the dose of verapamil may be decreased.

Carbamazepine.

Verapamil therapy may increase carbamazepine concentrations during combined therapy. This may produce carbamazepine side effects such as diplopia, headache, ataxia, or dizziness.

Erythromycin, clarithromycin and telithromycin.

Erythromycin, clarithromycin and telithromycin therapy may increase serum levels of verapamil.

Rifampicin.

Blood pressure lowering effect may be reduced.

Phenobarbital.

Phenobarbitone therapy may increase verapamil clearance.

Cyclosporin.

Verapamil therapy may increase serum levels of cyclosporin.

Everolimus, sirolimus and tacrolimus.

Verapamil therapy may increase serum levels of everolimus, sirolimus and tacrolimus.

Buspirone.

Verapamil therapy may increase plasma levels of buspirone.

Midazolam.

Verapamil therapy may increase plasma levels of midazolam.

Theophylline.

Verapamil therapy may inhibit the clearance and increase the plasma levels of theophylline.

Phenytoin.

Verapamil therapy may alter plasma levels of phenytoin.

Alcohol.

Verapamil therapy may inhibit metabolism of alcohol increasing its CNS depressant effects.

Inhalation anaesthetics.

Animal experiments have shown that inhalation anaesthetics depress cardiovascular activity by decreasing the inward movement of calcium ions. When used concomitantly, inhalation anaesthetics and calcium antagonists, such as verapamil, should each be titrated carefully to avoid excessive cardiovascular depression.

Neuromuscular blocking agents.

Clinical data and animal studies suggest that verapamil may potentiate the activity of neuromuscular blocking agents (curare-like and depolarising). It may be necessary to decrease the dose of verapamil and/or the dose of the neuromuscular blocking agent when the drugs are used concomitantly.

Grapefruit juice.

Grapefruit juice has been shown to increase the plasma levels of verapamil and, therefore, grapefruit and its juice should not be taken with verapamil hydrochloride.

HMG-CoA reductase inhibitors.

Treatment with HMG-CoA reductase inhibitors (e.g. simvastatin or atorvastatin) in a patient taking verapamil should be started at the lowest possible dose and titrated upwards. If verapamil treatment is to be added to patients already taking a HMG-CoA reductase inhibitor (e.g. simvastatin or atorvastatin), consider a reduction in the statin dose and retitrate against serum cholesterol concentrations.
Verapamil hydrochloride may increase the serum levels of HMG-CoA reductase inhibitors primarily metabolised by CYP3A enzymes (e.g. atorvastatin and simvastatin). An interaction in healthy subjects demonstrated a 43% increase in verapamil AUC in combination with atorvastatin. Consider using caution when these HMG-CoA reductase inhibitors and verapamil are concomitantly administered.
Fluvastatin, pravastatin and rosuvastatin are not metabolised by CYP3A4 and are less likely to interact with verapamil.

Sulfinpyrazone.

Blood pressure lowering effect may be reduced.

Aspirin.

Increased tendency to bleed.

Dabigatran.

Use of dabigatran with verapamil may increase the bioavailability of dabigatran.
Verapamil immediate release: increased dabigatran (Cmax up to 180% and AUC up to 150%).
Verapamil sustained release: increased dabigatran (Cmax up to 90% and AUC up to 70%).
When coadministered with oral verapamil, the dose of dabigatran may need to be reduced (refer to dabigatran product information for dabigatran dosing instructions) as the risk of bleeding may increase.
No meaningful interaction was observed when verapamil was given 2 hours after dabigatran etexilate (increase of Cmax by about 10% and AUC by about 20%).
Close clinical surveillance is recommended when verapamil is combined with dabigatran etexilate and particularly in the occurrence of bleeding, notably in patients having mild to moderate renal impairment.
Simultaneous initiation of treatment with dabigatran etexilate and oral verapamil is contraindicated (see Section 4.3 Contraindications).
Treatment initiation with oral verapamil in patients following major orthopaedic surgery who are already treated with dabigatran etexilate is contraindicated (see Section 4.3 Contraindications).

Doxorubicin.

Caution should be used when oral verapamil is administered in combination with doxorubicin due to the potential for increased doxorubicin levels.

Colchicine.

Colchicine is a substrate for both CYP3A and the efflux transporter, P-glycoprotein (P-gp). Verapamil is known to inhibit CYP3A and P-gp. When verapamil and colchicines are administered together, inhibition of P-gp and/or CYP3A by verapamil may lead to increased exposure to colchicine. Combined use is not recommended.

Imipramine.

Verapamil therapy may increase serum levels of imipramine.

Glibenclamide.

Verapamil therapy may increase serum levels of glibenclamide.

4.6 Fertility, Pregnancy and Lactation

Effects on fertility.

Studies in female rats at daily dietary doses up to 5.5 times (55 mg/kg/day) the maximum recommended human dose did not show impaired fertility. Effects on male fertility have not been determined.
(Category C)
Verapamil carries the potential to produce fetal hypoxia associated with maternal hypotension.
Reproduction studies have been performed in rabbits and rats at oral doses up to 1.5 (15 mg/kg/day) and 6 (60 mg/kg/day) times the human oral daily dose, respectively, and have revealed no evidence of teratogenicity. In the rat, however, this multiple of the human dose was embryocidal and retarded foetal growth and development, probably because of adverse maternal effects reflected in the reduced weight gains of the dams. This oral dose has also been shown to cause hypotension in rats. There are no adequate and well controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Verapamil crosses the placental barrier and can be detected in umbilical vein blood at delivery.
Australian categorisation of Category C. Drugs which, owing to their pharmacological effects, have caused or may be suspected of causing, harmful effects on the human foetus or neonate without causing malformations. These effects may be reversible. Accompanying texts should be consulted for further details.

Labour and delivery.

Verapamil crosses the placental barrier and can be detected in umbilical vein blood at delivery. It is not known whether the use of verapamil during labour or delivery has immediate or delayed adverse effects on the foetus or whether it prolongs the duration of labour or increases the need for forceps delivery or other obstetric intervention. Such adverse experiences have not been reported in the literature, despite a long history of use of verapamil in Europe in the treatment of cardiac side effects of beta-adrenergic agonist agents used to treat premature labour.
Verapamil is excreted in human milk. Limited human data from oral administration have shown that the estimated infant dose is low (0.01-1% of the mother's oral dose). Because of the potential for adverse reactions in breastfed infants, verapamil should only be used during lactation if it is essential for the welfare of the mother.

4.8 Adverse Effects (Undesirable Effects)

Verapamil is usually well tolerated.
Serious adverse reactions are uncommon when verapamil therapy is initiated with upward dose titration within the recommended single and total daily dose. See Section 4.4 Special Warnings and Precautions for Use for discussion of heart failure, hypotension, elevated liver enzymes, A-V block and rapid ventricular response. See Section 5.1 Pharmacodynamic Properties, Clinical trials.
The following reactions, reported in 1% or less of patients, occurred under verapamil HCl administration in general (all formulations) and most of them under conditions (open trials, marketing experience) where a causal relationship is uncertain; they are listed to alert the physician to a possible relationship.

Cardiovascular.

Angina pectoris, atrioventricular dissociations, chest pain, claudication, myocardial infarction, palpitations, purpura (vasculitis), syncope.

Digestive system.

Diarrhoea, dry mouth, gastrointestinal distress, abdominal discomfort/ pain, gingival hyperplasia.

Haemic and lymphatic.

Ecchymosis or bruising.

Nervous system.

Cerebrovascular accident, confusion, equilibrium disorders, insomnia, muscle cramps, paraesthesia, psychotic symptoms, shakiness, somnolence.

Skin.

Arthralgia and rash, exanthema, hair loss, hyperkeratosis, maculae, sweating, urticaria, Stevens-Johnson syndrome, erythema multiforme.

Special senses.

Blurred vision.

Ear and labyrinth disorders.

Vertigo, tinnitus.

Urogenital.

Gynaecomastia, increased urination, spotty menstruation, impotence.

Treatment of acute cardiovascular adverse reactions.

The frequency of cardiovascular adverse reactions which require therapy is rare; hence, experience with their treatment is limited. Whenever severe hypotension or complete A-V block occur following oral administration of verapamil, the appropriate emergency measures should be applied immediately, e.g. intravenously administered isoprenolol, noradrenaline, atropine (all in the usual doses), or calcium gluconate (10% solution). In patients with hypertrophic cardiomyopathy (IHSS), alpha-adrenergic agents (phenylephrine, metaraminol bitartrate or methoxamine) should be used to maintain blood pressure, and isoprenolol and noradrenaline should be avoided. If further support is necessary, inotropic agents (dopamine or dobutamine) may be administered.
Actual treatment and dosage should depend on the severity and the clinical situation and the judgment and experience of the treating physician.

Adverse effects from post-marketing surveillance.

There has been a single postmarketing report of paralysis (tetraparesis) associated with the combined use of verapamil and colchicine. This may have been caused by colchicine crossing the blood brain barrier due to CYP3A and P-gp inhibition by verapamil. Combined use of verapamil and colchicine is not recommended.
Other adverse effects reported from post-marketing surveillance include myalgia, vomiting, tachycardia, ileus, galactorrhoea, increased blood prolactin, extrapyramidal syndrome, hyperkalaemia, dyspnoea and renal failure.

Reporting suspected adverse effects.

Reporting suspected adverse reactions after registration of the medicinal product is important. It allows continued monitoring of the benefit-risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions at www.tga.gov.au/reporting-problems.

4.2 Dose and Method of Administration

The individual dose and frequency of dosing should be determined in accordance with the indication and individual patient response.

Adults.

The usual starting dose is one 80 mg tablet two or three times daily. The maintenance dose may be adjusted to two 80 mg tablets two or three times daily.

Usual maintenance dose.

160 mg twice daily.

Children.

Dose range 40 to 360 mg per day in two or three divided daily doses according to age and response.

Elderly, impaired renal function.

The recommended daily dosage is usually well tolerated.

Impaired hepatic function.

Caution should be exercised when initiating therapy since the pharmacological action of verapamil hydrochloride may be increased or prolonged by hepatic insufficiency.

4.7 Effects on Ability to Drive and Use Machines

Due to its antihypertensive effect, depending on the individual response, verapamil hydrochloride may affect the ability to react to the point of impairing the ability to drive a vehicle, operate machinery or work under hazardous conditions. This applies all the more at the start of treatment, when the dose is raised, when switching from another drug and in conjunction with alcohol. Verapamil may increase the blood levels of alcohol and slow its elimination. Therefore, the effects of alcohol may be exaggerated.

4.9 Overdose

Symptoms.

Bradycardia, cardiac arrest, second and third degree A-V block, hypotension and myocardial insufficiency.
Fatalities have occurred as a result of overdose.

Treatment.

Treatment of overdosage should be supportive. Beta-adrenergic stimulation or parenteral administration of calcium solutions may increase calcium ion flux across the slow channel, and have been used effectively in treatment of deliberate overdosage with verapamil. Verapamil cannot be removed by haemodialysis. Clinically significant hypotensive reactions or fixed high degree A-V block should be treated with vasopressor agents or cardiac pacing, respectively. Asystole should be handled by the usual measures including cardiopulmonary resuscitation.
For information on the management of overdose, contact the Poisons Information Centre on 13 11 26 (Australia).

7 Medicine Schedule (Poisons Standard)

S4.

6 Pharmaceutical Particulars

6.1 List of Excipients

Each Verapamil Mylan tablet contains verapamil hydrochloride 40 mg or 80 mg as the active ingredient. The tablets also contain the following inactive ingredients: lactose, microcrystalline cellulose, pregelatinised maize starch, sodium starch glycollate, purified talc and magnesium stearate. Verapamil Mylan 40 also contains Opadry Yellow OY-LS-32814 and Verapamil Mylan 80 contains Opadry Orange OY-LS-33113.

6.2 Incompatibilities

See Section 4.5 Interactions with Other Medicines and Other Forms of Interactions.

6.3 Shelf Life

In Australia, information on the shelf life can be found on the public summary of the Australian Register of Therapeutic Goods (ARTG). The expiry date can be found on the packaging.

6.4 Special Precautions for Storage

Store below 30°C.
This medicinal product does not require any special storage conditions.

6.5 Nature and Contents of Container

Container type: HDPE Bottle with child-resistant PP cap.
Pack sizes: available in packs of 100's bottles* of 30's, 90's and 100's*.
*Marketed in Australia.

6.6 Special Precautions for Disposal

In Australia, any unused medicine or waste material should be disposed of by taking it to your local pharmacy.

Summary Table of Changes