Consumer medicine information

Rizatriptan ODT-WGR

Rizatriptan

BRAND INFORMATION

Brand name

Rizatriptan ODT-WGR

Active ingredient

Rizatriptan

Schedule

S4

 

Consumer medicine information (CMI) leaflet

Please read this leaflet carefully before you start using Rizatriptan ODT-WGR.

SUMMARY CMI

RIZATRIPTAN ODT-WGR

Consumer Medicine Information (CMI) summary

The full CMI on the next page has more details. If you are worried about using this medicine, speak to your doctor or pharmacist.

1. Why am I using RIZATRIPTAN ODT-WGR?

RIZATRIPTAN ODT-WGR contains the active ingredient rizatriptan benzoate. RIZATRIPTAN ODT-WGR is used to relieve the headache pain and other symptoms of migraine attacks.

For more information, see Section 1. Why am I using RIZATRIPTAN ODT-WGR? in the full CMI.

2. What should I know before I use RIZATRIPTAN ODT-WGR?

Do not use if you have ever had an allergic reaction to RIZATRIPTAN ODT-WGR or any of the ingredients listed at the end of the CMI.

Talk to your doctor if you have any other medical conditions, take any other medicines, or are pregnant or plan to become pregnant or are breastfeeding.

For more information, see Section 2. What should I know before I use RIZATRIPTAN ODT-WGR? in the full CMI.

3. What if I am taking other medicines?

Some medicines may interfere with RIZATRIPTAN ODT-WGR and affect how it works.

A list of these medicines is in Section 3. What if I am taking other medicines? in the full CMI.

4. How do I use RIZATRIPTAN ODT-WGR?

  • Take Rizatriptan ODT-WGR only when prescribed by your doctor
  • The usual dose to treat a migraine is one 10 mg orally disintegrating tablet
  • If the first RIZATRIPTAN ODT-WGR orally disintegrating tablet does help your migraine, but it comes back later, you may take another orally disintegrating tablet. Take the second orally disintegrating tablet at least 2 hours after the first.

More instructions can be found in Section 4. How do I use RIZATRIPTAN ODT-WGR? in the full CMI.

5. What should I know while using RIZATRIPTAN ODT-WGR?

Things you should do
  • Remind any doctor, dentist or pharmacist you visit that you are using RIZATRIPTAN ODT-WGR.
  • If your headache is more severe than your 'usual' migraine or it behaves differently, tell your doctor
  • If you become pregnant while taking RIZATRIPTAN ODT-WGR, tell your doctor immediately
Things you should not do
  • Do not give RIZATRIPTAN ODT-WGR to anyone else, even if they have the same condition as you
Driving or using machines
  • Before you drive a car, operate machinery or do anything else that could be dangerous if you are sleepy or dizzy, be careful as RIZATRIPTAN ODT-WGR may cause sleepiness or dizziness in some people
Drinking alcohol
  • If you drink alcohol, sleepiness or dizziness may be worse
Looking after your medicine
  • Store in a cool dry place where the temperature stays below 30°C

For more information, see Section 5. What should I know while using RIZATRIPTAN ODT-WGR? in the full CMI.

6. Are there any side effects?

There are a number of side effects associated with this medicine. It is important to be aware of them so that you can identify any symptoms if they occur (see the full CMI for more details). The most common side effects include dizziness, somnolence and weakness/fatigue. If you experience swelling of the face, lips, mouth, tongue or throat which may cause difficulty in swallowing or breathing, tell your doctor immediately or go to accident and emergency at your nearest hospital.

For more information, including what to do if you have any side effects, see Section 6. Are there any side effects? in the full CMI.



FULL CMI

RIZATRIPTAN ODT-WGR

Active ingredient: rizatriptan (as benzoate)

Consumer Medicine Information (CMI)

This leaflet provides important information about using RIZATRIPTAN ODT-WGR. You should also speak to your doctor or pharmacist if you would like further information or if you have any concerns or questions about using RIZATRIPTAN ODT-WGR.

Where to find information in this leaflet:

1. Why am I using RIZATRIPTAN ODT-WGR?
2. What should I know before I use RIZATRIPTAN ODT-WGR?
3. What if I am taking other medicines?
4. How do I use RIZATRIPTAN ODT-WGR?
5. What should I know while using RIZATRIPTAN ODT-WGR?
6. Are there any side effects?
7. Product details

1. Why am I using RIZATRIPTAN ODT-WGR?

RIZATRIPTAN ODT-WGR contains the active ingredient rizatriptan. Rizatriptan is a serotonergic agonist. During a migraine attack, blood vessels in the brain dilate, or widen, resulting in a throbbing pain. Rizatriptan decreases this widening, returning the blood vessels to their normal size, and therefore helps to relieve the pain. It also blocks the release of certain chemicals from nerve endings that cause more pain and other symptoms of migraine.

RIZATRIPTAN ODT-WGR is used to relieve the headache pain and other symptoms of migraine attacks. RIZATRIPTAN ODT-WGR does not work for other types of headaches.

There is no single cause of migraine. It tends to run in families. Certain things, singly or in combination, can trigger migraine attacks in some people. If you understand what triggers your attacks, you may be able to prevent migraine attacks or reduce their frequency.

Keeping a headache diary will help you identify and monitor all of the possible migraine triggers you encounter. Once the triggers are identified, you and your doctor can modify your treatment and lifestyle appropriately.

2. What should I know before I use RIZATRIPTAN ODT-WGR?

Warnings

Do not use RIZATRIPTAN ODT-WGR if:

  • you are allergic to rizatriptan, or any of the ingredients listed at the end of this leaflet. Always check the ingredients to make sure you can use this medicine.
  • you have high blood pressure that is not being treated
  • you have heart disease (including angina or a previous heart attack)
  • you have or have had a stroke or transient ischaemic attack (TIA)
  • you have blood vessel problems, including ischaemic bowel disease
  • you are currently taking monoamine oxidase inhibitors (MAOIs) for depression or have taken them within the last two weeks
  • the packaging is torn or shows signs of tampering
  • the expiry date on the pack has passed

Do not give RIZATRIPTAN ODT-WGR to children under 18 years of age.

Check with your doctor if you:

  • have, or have had, any other medical conditions
  • take any medicines for any other condition
  • you have any risks factors for heart or blood vessel disease, including high blood pressure, diabetes, smoking, a high cholesterol level and/or a family history of heart or blood vessel disease
  • you are not sure whether you should start taking RIZATRIPTAN ODT-WGR
  • your headache is more severe than your 'usual' migraine, and/or it behaves differently
  • you have a condition called phenylketonuria as the tablets contain phenylamine (a component of aspartame)
  • you have any allergies to any other medicines or any other substances, such as foods, preservatives or dyes

If you have not told your doctor about any of the above, tell them before you take any RIZATRIPTAN ODT-WGR.

During treatment, you may be at risk of developing certain side effects. It is important you understand these risks and how to monitor for them. See additional information under Section 6. Are there any side effects?

Pregnancy and breastfeeding

Check with your doctor if you are pregnant or intend to become pregnant.

Like most medicines, RIZATRIPTAN ODT-WGR is not recommended for use during pregnancy. If there is a need to consider RIZATRIPTAN ODT-WGR during pregnancy, your doctor will discuss with you the risks and benefits of taking them during pregnancy.

Talk to your doctor if you are breastfeeding or intend to breastfeed.

It is not known whether RIZATRIPTAN ODT-WGR passes into breast milk. Your doctor will discuss with you the risks and benefits of taking them while breast-feeding.

3. What if I am taking other medicines?

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

Some medicines should not be taken with RIZATRIPTAN ODT-WGR. These include:

  • monoamine oxidase inhibitors (MAOIs) used to treat depression, including moclobemide, tranylcypromine, phenelzine, pargyline
  • sumatriptan, another similar medicine used to treat migraine

Ask your doctor for instructions about taking RIZATRIPTAN ODT-WGR if you are also taking:

  • selective serotonin reuptake inhibitors (SSRIs) such as sertraline, escitalopram oxalate or fluoxetine
  • serotonin norepinephrine reuptake inhibitors (SNRIs) such as venlafaxine and duloxetine for depression

Some medicines, herbal products or dietary supplements, and RIZATRIPTAN ODT-WGR may interfere with each other. These include:

  • propranolol (a medicine used to treat high blood pressure)
  • ergotamine, dihydroergotamine or other medicines used to treat migraine
  • methysergide (a medicine used to prevent migraine)
  • St. John's Wort (Hypericum perforatum), a herbal product sold as a dietary supplement or products containing St. John's Wort

Check with your doctor or pharmacist if you are not sure about what medicines, vitamins or supplements you are taking and if these affect RIZATRIPTAN ODT-WGR.

4. How do I use RIZATRIPTAN ODT-WGR?

How much to take / use

  • Take only when prescribed by your doctor
  • The usual dose to treat a migraine is one 10 mg orally disintegrating tablet

Do not remove the orally disintegrating tablet from the blister until just prior to dosing. With dry hands push the orally disintegrating tablet through the foil and place the orally disintegrating tablet on your tongue.

The orally disintegrating tablet will dissolve rapidly and be swallowed with your saliva. No water is needed for taking the orally disintegrating tablet.

It does not matter if you take RIZATRIPTAN ODT-WGR before or after food.

Follow the instructions provided and use RIZATRIPTAN ODT-WGR until your doctor tells you to stop.

When to take / use RIZATRIPTAN ODT-WGR

  • RIZATRIPTAN ODT-WGR should be used when you suffer a migraine attack
  • If the first RIZATRIPTAN ODT-WGR orally disintegrating tablet does help your migraine, but it comes back later, you may take another orally disintegrating tablet
  • Take the second orally disintegrating tablet at least 2 hours after the first. Do not take more than 30 mg (three 10 mg orally disintegrating tablets) in a 24 hour period.
  • If the first RIZATRIPTAN ODT-WGR orally disintegrating tablet does not help your migraine, do not take another orally disintegrating tablet for the same attack as it is unlikely to help. It is still likely, however, that you will respond to RIZATRIPTAN ODT-WGR during your next attack.

If you forget to use RIZATRIPTAN ODT-WGR

  • RIZATRIPTAN ODT-WGR should be used when you suffer a migraine attack
  • If required only take a second tablet at least two hours after taking the first tablet

If you use too much RIZATRIPTAN ODT-WGR

If you think that you have used too much RIZATRIPTAN ODT-WGR, you may need urgent medical attention.

You should immediately:

  • phone the Poisons Information Centre
    (by calling 13 11 26), or
  • contact your doctor, or
  • go to the Emergency Department at your nearest hospital.

You should do this even if there are no signs of discomfort or poisoning.

5. What should I know while using RIZATRIPTAN ODT-WGR?

Things you should do

If your headache is more severe than your 'usual' migraine or it behaves differently, tell your doctor.

If you are about to be started on any new medicine, tell your doctor and pharmacist that you take RIZATRIPTAN ODT-WGR for migraines.

If you become pregnant while taking RIZATRIPTAN ODT-WGR, tell your doctor immediately.

Call your doctor straight away if you:

  • do not feel well while you are taking RIZATRIPTAN ODT-WGR

Remind any doctor, dentist or pharmacist you visit that you are using RIZATRIPTAN ODT-WGR.

Things you should not do

  • Do not give RIZATRIPTAN ODT-WGR to anyone else, even if they have the same condition as you

Driving or using machines

Be careful before you drive or use any machines or tools until you know how RIZATRIPTAN ODT-WGR affects you.

RIZATRIPTAN ODT-WGR may cause sleepiness or dizziness in some people. Make sure you know how you react to RIZATRIPTAN ODT-WGR before you drive a car, operate machinery, or do anything else that could be dangerous if you are sleepy or dizzy.

Drinking alcohol

Tell your doctor if you drink alcohol.

Alcohol may cause sleepiness or dizziness to be worse.

Looking after your medicine

  • Keep RIZATRIPTAN ODT-WGR in a cool dry place where the temperature stays below 30°C

Follow the instructions on the carton on how to take care of your medicine properly.

Store it in a cool dry place away from moisture, heat or sunlight; for example, do not store it:

  • in the bathroom or near a sink, or
  • in the car or on window sills.

Keep it where young children cannot reach it.

Getting rid of any unwanted medicine

If you no longer need to use this medicine or it is out of date, take it to any pharmacy for safe disposal.

Do not use this medicine after the expiry date.

6. Are there any side effects?

All medicines can have side effects. If you do experience any side effects, most of them are minor and temporary. However, some side effects may need medical attention.

See the information in the table and, if you need to, ask your doctor or pharmacist if you have any further questions about side effects.

Dizziness, sleepiness and tiredness are the most common side effects of RIZATRIPTAN ODT-WGR. For the most part, these have been mild.

Less serious side effects

Less serious side effectsWhat to do
  1. Difficulty thinking or working because of:
  • sleepiness, tiredness
  • dizziness
  • inability to sleep
  • decreased mental sharpness
  • nervousness / agitation
  • seeing/ feeling/ hearing things that are not there
  • headache not relieved by RIZATRIPTAN ODT-WGR
  1. Stomach or bowel problems
  • feeling sick (nausea), vomiting
  • stomach upset or pain
  • diarrhoea
  1. Changes in your sight or taste such as:
  • blurred vision
  • dry mouth
  • thirst
  • bad taste
  • throat discomfort
  • tongue swelling
  1. Skin problems:
  • skin rash, itching
  • redness or flushing of the face
  • hot flushes, sweating
  1. Changes in the way your body feels, such as:
  • feelings of heaviness or tightness on parts of the body
  • muscle weakness
  • muscle pain
  • tingling or numbness of the hands or feet
  • tremor, unsteadiness when walking
  • spinning sensation, also called vertigo
  • very high temperature
  • unusually increased reflexes or lack of coordination
  1. Fast, slow or irregular heart beats, palpitations
  2. Neck pain or facial pain
Speak to your doctor if you have any of these less serious side effects and they worry you.

Abnormalities of the electrocardiogram (a test that records the electrical activity of your heart) have also been reported.

If you take RIZATRIPTAN ODT-WGR too often, you may get chronic headaches. Contact your doctor as you may have to stop taking RIZATRIPTAN ODT-WGR.

Serious side effects

Serious side effectsWhat to do
  • fainting, coma
  • pinkish, itchy swellings on the skin, also called hives or nettle rash
  • swelling of the face, lips, mouth, tongue or throat which may cause difficulty in swallowing or breathing
  • shortness of breath, wheezing
  • pain or tightness in chest (which may be symptoms of heart attack or angina)
  • collapse, numbness or weakness of the arms or legs, headache, dizziness and confusion, visual disturbance, difficulty swallowing, slurred speech and loss of speech (which may be symptoms of stroke)
  • severe skin reaction which starts with painful red areas, then large blisters and ends with peeling of layers of skin. This is accompanied by fever and chills, aching muscles and generally feeling unwell.
  • seizures, fits or convulsions
  • persistent purple discolouration, and/or pain in the fingers, toes, ears, nose or jaw
  • pain or spasms in the lower stomach, bloody diarrhoea and fever
Call your doctor straight away, or go straight to the Emergency Department at your nearest hospital if you notice any of these serious side effects.

As with other medicines in the same class as RIZATRIPTAN ODT-WGR, heart attack, angina and stroke have been reported very rarely and generally occurred in people with risk factors for heart or blood vessel disease (including high blood pressure, diabetes, smoking, family history of heart or blood vessel disease such as stroke).

Tell your doctor or pharmacist if you notice anything else that may be making you feel unwell.

Other side effects not listed here may occur in some people.

Reporting side effects

After you have received medical advice for any side effects you experience, you can report side effects to the Therapeutic Goods Administration online at www.tga.gov.au/reporting-problems. By reporting side effects, you can help provide more information on the safety of this medicine.

Always make sure you speak to your doctor or pharmacist before you decide to stop taking any of your medicines.

7. Product details

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

What RIZATRIPTAN ODT-WGR contains

Active ingredient
(main ingredient)		Rizatriptan (as benzoate)
Other ingredients
(inactive ingredients)		mannitol
microcrystalline cellulose
calcium silicate
crospovidone
aspartame
silica colloidal anhydrous
peppermint flavour
magnesium stearate
Potential allergensaspartame

Do not take this medicine if you are allergic to any of these ingredients.

What RIZATRIPTAN ODT-WGR looks like

RIZATRIPTAN ODT-WGR (AUST R 432350) is a white, round, flat, bevel-edged tablet embossed with “IZ 10” on one side and plain on the other side.

A pack contains 2 orally disintegrating tablets.

Who distributes RIZATRIPTAN ODT-WGR

Wagner Pharmaceuticals Pty Ltd
6 Albert Street, Preston
VIC 3072
Tel: 1800 936 140

This leaflet was prepared in December 2024.

Published by MIMS March 2025

BRAND INFORMATION

Brand name

Rizatriptan ODT-WGR

Active ingredient

Rizatriptan

Schedule

S4

 

1 Name of Medicine

Rizatriptan benzoate.

2 Qualitative and Quantitative Composition

Each orally disintegrating tablet contains 14.53 mg of rizatriptan benzoate (corresponding or 10 mg of rizatriptan, respectively).
Also contains aspartame.
For the full list of excipients, see Section 6.1 List of Excipients.

3 Pharmaceutical Form

Each orally disintegrating tablet contains 10 mg of rizatriptan - white, round, flat, bevel-edged tablet embossed with "IZ 10" on one side and plain on the other side.

4 Clinical Particulars

4.1 Therapeutic Indications

Rizatriptan ODT-WGR is indicated for the acute treatment of migraine attacks with or without aura.

4.2 Dose and Method of Administration

The recommended dose is 10 mg. Clinical experience has shown that this dose provides the optimal clinical benefit.
Onset of relief (i.e. reduction of headache pain to mild or none) can occur within 30 minutes after dosing.

Re-dosing.

Doses should be separated by at least 2 hours; no more than 30 mg should be taken in any 24-hour period.

For headache recurrence within 24 hours.

If headache returns after relief of the initial attack, further doses may be taken. The above dosing limits should be observed.

After non-response.

The effectiveness of a second dose for treatment of the same attack, when an initial dose is ineffective, has not been examined in controlled trials.
Clinical studies have shown that patients who do not respond to treatment of an attack are still likely to respond to treatment for subsequent attacks.

Patients receiving propranolol.

Plasma concentrations of rizatriptan may be increased by concomitant administration of propranolol (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions). The 10 mg dose is not appropriate for these patients. The physician should consider alternative therapies for these patients, for example, other 5-HT1B/1D agonists that do not have this drug interaction.
Rizatriptan ODT-WGR orally disintegrating tablets are rapidly dissolving tablets. Administration with liquid is not necessary.
Patients should be instructed not to remove the orally disintegrating tablet from the blister until just prior to dosing. The orally disintegrating tablet should then be pushed through the foil with dry hands and placed on the tongue.

4.3 Contraindications

Rizatriptan ODT-WGR is contraindicated in patients with:
hypersensitivity to rizatriptan or any of the ingredients;
concurrent administration of monoamine oxidase (MAO) inhibitors, or use within 2 weeks of discontinuation of MAO inhibitor therapy (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Based on the mechanism of action of this class of compounds, Rizatriptan ODT-WGR is also contraindicated in patients with:
uncontrolled hypertension;
established coronary artery disease, including ischemic heart disease (angina pectoris, history of myocardial infarction, or documented silent ischemia), signs and symptoms of ischemic heart disease, or Prinzmetal's angina;
history of stroke or transient ischemic attack (TIA);
peripheral vascular disease, including (but not limited to) ischemic bowel disease.

4.4 Special Warnings and Precautions for Use

Rizatriptan should only be administered to patients in whom a clear diagnosis of migraine has been established. Rizatriptan should not be administered to patients with basilar or hemiplegic migraine.
Rizatriptan should not be used to treat "atypical" headaches, i.e. those that might be associated with potentially serious medical conditions (e.g. stroke, ruptured aneurysm) in which cerebrovascular vasoconstriction could be harmful.
There have been rare reports of serious coronary events with this class of drugs including rizatriptan (see Section 4.8 Adverse Effects (Undesirable Effects)). Prior to prescribing this drug, cardiovascular assessment should be considered in patients at risk for coronary artery disease (CAD) [e.g. patients with hypertension, diabetics, smokers, and those with strong family history for CAD]. Those in whom CAD is established should not be given rizatriptan (see Section 4.3 Contraindications).
Other 5-HT1B/1D agonists (e.g. sumatriptan) should not be used concomitantly with rizatriptan.
Administration of ergotamine-type medications (e.g. ergotamine, dihydro-ergotamine or methysergide) and rizatriptan within 6 hours of each other is not recommended. Although additive vasospastic effects were not observed in a clinical pharmacology study in which 16 healthy males received oral rizatriptan and parenteral ergotamine, such additive effects are theoretically possible.
Cases of life-threatening serotonin syndrome have been reported during combined use of selective serotonin reuptake inhibitors (SSRIs)/serotonin norepinephrine reuptake inhibitors (SNRIs) and triptans. If concomitant treatment with rizatriptan and an SSRI (e.g. sertraline, escitalopram oxalate, and fluoxetine) or SNRI (e.g. venlafaxine, duloxetine) is clinically warranted, careful observation of the patient is advised, particularly during treatment initiation and dose increases. Serotonin syndrome symptoms may include mental status changes (e.g. agitation, hallucinations, coma), autonomic instability (e.g. tachycardia, labile blood pressure, hyperthermia), neuromuscular aberrations (e.g. hyperreflexia, incoordination) and/or gastrointestinal symptoms (e.g. nausea, vomiting, diarrhoea) (see Section 4.5 Interactions with Other Medicines and Other Forms of Interactions).
Overuse of acute migraine drugs may lead to exacerbation of headache (medication overuse headache). Medication overuse headache may present as migraine-like daily headaches or as a marked increase in frequency of migraine attacks. Detoxification of patients, including withdrawal of the overused drugs, and treatment of withdrawal symptoms (which often includes a transient worsening of headache) may be necessary.

Use by gender or in individuals of various ethnic origins.

There is no evidence that gender or ethnic origin has any influence on the efficacy or adverse effects of rizatriptan. In controlled trials, there were no apparent differences in overall adverse experience rates or efficacy of treatment between males and females, or between various ethnic groups.

Phenylketonurics.

Phenylketonuric patients should be informed that Rizatriptan ODT-WGR contain phenylalanine (a component of aspartame). Each 10 mg tablet contains 8.8 mg phenylalanine.

Lactose intolerance.

The quantity of lactose in each tablet (60.50 mg in the 10 mg tablet) is probably not sufficient to induce specific symptoms of lactose intolerance.

Use in the elderly.

The pharmacokinetics of rizatriptan were similar in elderly (aged ≥ 65 years) and in younger adults. Because migraine occurs infrequently in the elderly, clinical experience with rizatriptan is limited in such patients. In clinical trials, there were no apparent differences in efficacy or in overall adverse experience rates between patients under 65 years of age and those 65 and above (n=17).

Paediatric use.

Children (under 12 years of age).

There are no data available on the use of rizatriptan in children under 12 years of age. Therefore, its use in this age group is not recommended.

Adolescents (12-17 years of age).

In placebo-controlled study, the efficacy of rizatriptan tablets was not established. Adverse events observed in this clinical trial were similar in nature to those reported in clinical trials in adults. The use of rizatriptan in patients under 18 years of age is not recommended.

Effects on laboratory tests.

In long-term controlled clinical trials, there were no clinically relevant, drug-related changes in laboratory parameters.

4.5 Interactions with Other Medicines and Other Forms of Interactions

Pharmacokinetic interactions.

Pharmacokinetic interaction studies were carried out with the MAO-A inhibitor, moclobemide; the selective serotonin reuptake inhibitor (SSRI), paroxetine; propranolol and two other beta-blockers, nadolol and metoprolol; and oral contraceptives. Significant interactions were seen with the MAO-A inhibitor and propranolol.

Cytochrome P450 isoforms.

Rizatriptan is not an inhibitor of the activities of human liver cytochrome P450 isoforms 3A4/5, 2C9, 2C19, or 2E1; however, rizatriptan is a competitive inhibitor (Ki =1400 nanoM) of cytochrome P450 2D6, (Cmax after a 10 mg dose was 74 nanoM). The activity of CYP1A2 was slightly inhibited by very high (10 microM) concentrations of rizatriptan.

Monoamine oxidase inhibitors.

Rizatriptan is principally metabolised via monoamine oxidase, 'A' subtype (MAO-A). Plasma concentrations of rizatriptan and its active N-monodesmethyl metabolite were increased by concomitant administration of a selective, reversible MAO-A inhibitor. Similar or greater effects are expected with nonselective, irreversible MAO inhibitors. Administration of rizatriptan to patients taking inhibitors of MAO is contraindicated (see Section 4.3 Contraindications).

Beta-blockers.

Plasma concentrations of rizatriptan may be increased by concomitant administration of propranolol. This increase is most probably due to first-pass metabolic interaction between the two drugs, since MAO-A plays a role in the metabolism of both rizatriptan and propranolol. In patients receiving propranolol, alternative therapy should be considered (see Section 4.2 Dose and Method of Administration). No pharmacokinetic interaction was observed between rizatriptan and the beta-blockers nadolol or metoprolol. Based on in vitro data, no pharmacokinetic interaction is expected with timolol or atenolol.

Selective serotonin reuptake inhibitors/ serotonin norepinephrine reuptake inhibitors and serotonin syndrome.

Cases of life-threatening serotonin syndrome have been reported during combined use of selective serotonin reuptake inhibitors (SSRIs) or serotonin norepinephrine reuptake inhibitors (SNRIs) and triptans (see Section 4.4 Special Warnings and Precautions for Use).

Paroxetine.

In a study of concurrent administration of the selective serotonin reuptake inhibitor (SSRI) paroxetine 20 mg/day for two weeks, with a single dose of rizatriptan 10 mg, neither the plasma concentrations of rizatriptan nor its safety profile were affected by paroxetine.

Oral contraceptives.

In a study of concurrent administration of an oral contraceptive during 6 days of administration of rizatriptan (10-30 mg/day), rizatriptan did not affect plasma concentrations of ethinyl estradiol or norethindrone. In clinical trials, the efficacy and incidences of adverse experiences were comparable in patients taking and those not taking oral contraceptives.

Experience in migraine patients.

In clinical trials, concomitant administration of medications commonly used for migraine prophylaxis did not alter the efficacy or incidences of adverse effects of rizatriptan. The overall adverse experience rates were comparable for patients on rizatriptan 10 mg who were receiving the following concomitant drugs: calcium channel blockers (n=72); tricyclic antidepressants (n=112); SSRIs (n=90); propranolol (n=108); other beta-blockers (n=175); valproic acid (n=20); opiate analgesics (n=572); oral contraceptives/estrogen replacement (n=304) as compared to those who did not receive such medications.

St. John's wort (Hypericum perforatum).

St John's wort may have pharmacodynamic interactions with medicines which effect serotonin, including 5-HT1B/1D agonists such as rizatriptan, used to treat migraines. These interactions may result in a variety of symptoms such as mental state change, autonomic dysfunction, and motor effects consistent with increased CNS serotonin. Therefore, rizatriptan should be used with caution when taking St. John's wort.

4.6 Fertility, Pregnancy and Lactation

Effects on fertility.

In a fertility study in rats, altered oestrus cyclicity and delays in time to mating were observed in females treated orally with 100 mg/kg/day rizatriptan. Plasma drug exposure (AUC) at this dose was approximately 215 times the exposure in humans receiving the maximum recommended daily dose (MRDD) of 30 mg. The no-effect dose was 10 mg/kg/day (approximately 15 times the human exposure at the MRDD). There were no other fertility related effects in the female rats. There was no impairment of fertility or reproductive performance in male rats treated with up to 250 mg/kg/day (approximately 530 times the human exposure at the MRDD).
(Category B1)

B1.

Medicines which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human foetus having been observed. Studies in animals have not shown evidence of an increased occurrence of foetal damage.
There are no adequate and well controlled studies in pregnant women.
Rat pup birth weight was reduced when maternal animals were treated orally throughout gestation with rizatriptan at approximately 10 times the MRDD based on AUC.
In developmental studies, no teratogenic effects were observed when pregnant rats and rabbits were administered doses achieving maternal exposure approximately 215 and 115 times human exposure at the maximum recommended daily dose (MRDD), respectively, during organogenesis. Foetal weights were decreased in conjunction with decreased maternal weight gain at the highest doses. The developmental no-effect dose in these studies was at maternal exposures approximately 15 times human exposure at the MRDD in both rats and rabbits. Kinetic studies demonstrated placental transfer in both species.
Rizatriptan should be used during pregnancy only if clearly needed.
 Two hours after oral administration of rizatriptan to lactating rats, the rizatriptan concentration in milk was 6 times higher than in maternal plasma. When rizatriptan was administered to lactating rats at 10 mg/kg PO (approx. 10 times anticipated maximum clinical exposure based on AUC), there was a significant reduction in pup body weight gain during lactation. It is not known whether rizatriptan is excreted in human milk. However, caution should be exercised when rizatriptan is administered to women who are breast-feeding.

4.7 Effects on Ability to Drive and Use Machines

Migraine or treatment with rizatriptan may cause somnolence in some patients. Dizziness has also been reported in some patients receiving rizatriptan. Patients should, therefore, evaluate their ability to perform complex tasks during migraine attacks and after administration of rizatriptan.

4.8 Adverse Effects (Undesirable Effects)

Adverse experiences were assessed in controlled clinical trials in which over 3,600 patients received single or multiple doses of rizatriptan. More than 1,500 patients were treated in long-term extension studies for up to one year.
In clinical trials, rizatriptan was generally well-tolerated. Adverse experiences were typically mild in intensity and transient. The most common drug-related adverse experiences were dizziness, somnolence, and asthenia/fatigue. Table 1 lists drug-related adverse experiences in acute Phase III trials in outpatients with migraine.
Additional drug-related adverse experiences in patients taking 1 or more doses of rizatriptan 10 mg during acute (incidence ≥ 1% and greater than placebo) or long-term (incidence ≥ 1%) clinical trials were, by body system:

Body as a whole.

Abdominal pain.

Cardiovascular.

Palpitation, tachycardia.

Digestive.

Diarrhoea, dyspepsia, thirst.

Musculoskeletal.

Neck pain, stiffness, regional tightness, muscle weakness.

Nervous system.

Decreased mental acuity, insomnia, hypoaesthesia, tremor, ataxia, nervousness, vertigo, disorientation.

Respiratory.

Dyspnoea.

Skin.

Pruritus, sweating.

Special senses.

Blurred vision.

Urogenital.

Hot flashes.
Syncope and hypertension each occurred in ≤ 0.1% of patients.
The incidences of adverse experiences were not affected by age, gender, or race (Caucasian vs. non-Caucasian).
The frequencies of adverse experiences in clinical trials did not increase over time or with concomitant use of drugs commonly taken for migraine prophylaxis (including propranolol), oral contraceptives, or analgesics.
The adverse experience profile seen with rizatriptan wafers was similar to that seen with rizatriptan tablets.

Post-marketing experience.

The following additional adverse reactions have been reported very rarely and most have been reported in patients with risk factors predictive of CAD: myocardial ischaemia or infarction, cerebrovascular accident.
The following adverse reactions have also been reported:

Hypersensitivity.

Hypersensitivity reaction, anaphylaxis/anaphylactoid reaction, angioedema (e.g. facial oedema, tongue swelling, pharyngeal oedema), wheezing, urticaria, rash, toxic epidermal necrolysis.

Musculoskeletal.

Facial pain, myalgia.

Special senses.

Dysgeusia.

Nervous system.

Serotonin syndrome, seizure.

Vascular disorders.

Peripheral vascular ischaemia.

Cardiac disorders.

Arrhythmia, bradycardia.

Gastrointestinal disorders.

Ischaemic colitis.

Investigations.

ECG abnormalities.

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.

4.9 Overdose

No overdoses of rizatriptan were reported during clinical trials.
Rizatriptan 40 mg (administered as either a single dose or as two doses with a 2-hour inter-dose interval) was generally well tolerated in over 300 patients; dizziness and somnolence were the most common drug-related adverse effects.
In a clinical pharmacology study in which 12 subjects received rizatriptan, at total cumulative doses of 80 mg (given within four hours), two subjects experienced syncope and/or bradycardia. One subject, a female aged 29 years, developed vomiting, bradycardia, and dizziness beginning three hours after receiving a total of 80 mg rizatriptan (administered over two hours). A third degree AV block, responsive to atropine, was observed an hour after the onset of the other symptoms. The second subject, a 25 year old male, experienced transient dizziness, syncope, incontinence, and a 5 second systolic pause (on ECG monitor) immediately after a painful venipuncture. The venipuncture occurred two hours after the subject had received a total of 80 mg rizatriptan (administered over four hours).
In addition, based on the pharmacology of rizatriptan, hypertension or other more serious cardiovascular symptoms could occur after overdosage. Gastrointestinal decontamination (e.g. gastric lavage followed by activated charcoal) should be considered in patients suspected of an overdose with rizatriptan. Clinical and electrocardiographic monitoring should be continued for at least 12 hours, even if clinical symptoms are not observed.
The effects of haemo- or peritoneal dialysis on serum concentrations of rizatriptan are unknown.
For information on the management of overdose, contact the Poisons Information Centre on 13 11 26 (Australia).

5 Pharmacological Properties

5.1 Pharmacodynamic Properties

Mechanism of action.

Rizatriptan is a potent, orally active serotonergic agonist that has been shown in radioligand binding assays and functional pharmacological bioassays to act selectively at 5-HT1B/1D receptors. Rizatriptan has no clinically significant activity at 5-HT2 or 5-HT3 receptor subtypes, nor at alpha- and beta-adrenergic, dopaminergic, histaminergic, muscarinic or benzodiazepine receptors.
Rizatriptan acts at craniovascular 5-HT1B receptors to cause selective constriction of the extracerebral, intracranial arteries that are thought to be dilated during a migraine attack. Vasodilatation of these arteries and stimulation of trigeminal sensory nervous pain pathways have been postulated to be the most important underlying mechanisms in migraine pathogenesis. In anaesthetised dogs, rizatriptan reduces carotid artery blood flow selectively and has much lesser effects on blood flow in the coronary and pulmonary artery vasculature.
Rizatriptan also inhibits cranial sensory pathways, possibly by acting at peripheral and central inhibitory 5-HT1D receptors that are present in animals and humans on trigeminal nerves. When stimulated, these trigeminal nerves release peptides (e.g. substance P, calcitonin gene related peptide and neurokinin A) that can produce vasodilation and inflammation around blood vessels in sensitive tissues, and which relay nociceptive information into the central nervous system. In animals, activation of trigeminal 5-HT1D receptors prevents the release of these peptides, leading to decreased dilation of sensitive blood vessels, decreased inflammation in the dura mater and reduced central pain transmission. These actions may also contribute to the clinical efficacy of rizatriptan in the relief of migraine.
Rizatriptan has only weak partial agonist constrictor effects on human isolated coronary artery segments in vitro. This finding is consistent with its lack of activity at 5-HT2A receptors, which are known to mediate contraction in these blood vessels.

Pharmacodynamics.

In healthy young male and female subjects who received maximal doses of rizatriptan (10 mg every 2 hours for three doses), slight increases in blood pressure (approximately 2-3 mmHg) were observed. These small, transient increases in blood pressure were not clinically significant. During long-term monitoring of migraine patients in controlled studies, no consistent effects on blood pressure or heart rate were observed.
At an oral dose of 40 mg, rizatriptan did not alter regional cerebral blood flow or middle cerebral artery blood velocity in healthy male subjects.
In a study in healthy male subjects, rizatriptan 10 mg produced slight, transient peripheral vasoconstriction (measured as a 5.1 mmHg increase in toe-arm systolic blood pressure gradient). In contrast, intravenous ergotamine (0.25 mg) produced a 14.6 mmHg increase in toe-arm systolic blood pressure gradient. When ergotamine and rizatriptan were given together, the increase in toe-arm systolic blood pressure gradient was similar to that when ergotamine was given alone.
Electrocardiographic effects of two 10 mg doses of rizatriptan, separated by 2 hours, were studied in 157 migraine patients (age range 18 to 72 years) during a migraine attack. No evidence of myocardial ischaemia was observed, as defined by standard ECG criteria. No clinically relevant ECG effects were observed.
In a study in healthy male subjects, the effects of rizatriptan, 10 and 15 mg, in a battery of tests of sympathetic reflexes were investigated in comparison to placebo and the sympatholytic drug, clonidine. No effects of rizatriptan on sympathetic reflexes were demonstrated.

Clinical trials.

Rizatriptan tablets.

The efficacy of rizatriptan tablets was established in four multicentre, randomised, placebo-controlled trials. Patients enrolled in these studies were primarily female (84%) and Caucasian (88%), with a mean age of 40 years (range of 18 to 71). Patients were instructed to treat a moderate to severe headache. Headache response, defined as a reduction of moderate or severe headache pain to no or mild headache pain, was assessed for up to 2 hours (Study 1) or up to 4 hours after dosing (Studies 2, 3 and 4). Associated symptoms of nausea, photophobia, and phonophobia and maintenance of response up to 24 hours post-dose were evaluated. A second dose of rizatriptan tablets was allowed 2 to 24 hours after dosing for treatment of recurrent headache in Studies 1 and 2. Additional analgesics and/or antiemetics were allowed 2 hours after initial treatment for rescue in all four studies.
In all studies, the percentage of patients achieving headache response 2 hours after treatment was significantly greater in patients who received either rizatriptan 10 mg compared to those who received placebo. In a separate study, doses of 2.5 mg were not different from placebo. Doses greater than 10 mg were associated with an increased incidence of adverse effects. The results from the 4 controlled studies using the marketed formulation are summarised in Table 2.
Comparisons of drug performance based upon results obtained in different clinical trials are never reliable. Because studies are conducted at different times, with different samples of patients, by different investigators, employing different criteria and/or different interpretations of the same criteria, under different conditions (dose, dosing regimen, etc.), quantitative estimates of treatment response and the timing of response may be expected to vary considerably from study to study.
The estimated probability of achieving an initial headache response within 2 hours following treatment is depicted in Figure 1.
For patients with migraine-associated photophobia, phonophobia, and nausea at baseline, there was a decreased incidence of these symptoms following administration of rizatriptan compared to placebo.
Two to 24 hours following the initial dose of study treatment, patients were allowed to use additional treatment for pain response in the form of a second dose of study treatment or other medication. The estimated probability of patients taking a second dose or other medication for migraine over the 24 hours following the initial dose of study treatment is summarised in Figure 2.
Efficacy was unaffected by the presence of aura; by the gender, or age of the patient; or by concomitant use of common migraine prophylactic drugs (e.g. beta-blockers, calcium channel blockers, tricyclic antidepressants) or oral contraceptives. There were insufficient data to assess the impact of race on efficacy.

Rizatriptan wafers.

The efficacy of rizatriptan wafer 10 mg was demonstrated in a randomised, placebo-controlled trial that was similar in design to the trials of rizatriptan tablets. Patients were instructed to treat a moderate to severe headache. Of the 312 patients treated in the study, 88% were female and 91% were Caucasian, with a mean age of 40 years (range 18-65).
By 2 hours post-dosing, response rates in patients treated with rizatriptan wafer were approximately 66% in either the 10 mg wafer groups, compared to 47% in the placebo group. This difference was statistically significant.
The estimated probability of achieving an initial headache response by 2 hours following treatment with rizatriptan wafer is depicted in Figure 3.
For patients with migraine-associated photophobia and phonophobia at baseline, there was a decreased incidence of these symptoms following administration of rizatriptan wafer as compared to placebo.
Two to 24 hours following the initial dose of study treatment, patients were allowed to use additional treatment for pain response in the form of a second dose of study treatment or other medication. The estimated probability of patients taking a second dose or other medication for migraine over the 24 hours following the initial dose of study treatment is summarised in Figure 4.

5.2 Pharmacokinetic Properties

Absorption.

Rizatriptan is rapidly and completely absorbed following oral administration. The mean oral bioavailability of the tablet is approximately 40 - 45%, and mean peak plasma concentrations (Cmax) are reached in approximately 1-1.5 hours (Tmax).
Administration of a 40 mg dose with a high-fat breakfast increased the extent of absorption of rizatriptan (approx. 19%), but delayed the absorption by approx. 1 hour. In clinical trials rizatriptan was administered without regard to food with no apparent effect on efficacy.
The bioavailability and Cmax of rizatriptan wafers (orally disintegrating tablets) are similar to that following tablet administration. The apparent rate of absorption is somewhat slower, with Tmax averaging 1.6-2.5 hours. Tmax for Rizatriptan ODT-WGR was measured at 1.9 hours.

Distribution.

Rizatriptan is minimally bound (14%) to plasma proteins. The volume of distribution is approximately 140 litres in male subjects, and 110 litres in female subjects.
Studies in rats indicate that rizatriptan crosses the blood-brain barrier to a limited extent.

Metabolism.

The primary route of rizatriptan metabolism is via oxidative deamination by monoamine oxidase-A (MAO-A) to the indole acetic acid metabolite, which is not pharmacologically active. N-monodesmethyl-rizatriptan, a metabolite with activity similar to that of parent compound at the 5HT1D receptor, is formed to a minor degree, but does not contribute significantly to the pharmacodynamic activity of rizatriptan. Plasma concentrations of N-monodesmethyl-rizatriptan are approximately 14% of those of parent compound, and it is eliminated at a similar rate. Other minor metabolites include the N-oxide, the 6-hydroxy compound, and the sulfate conjugate of the 6-hydroxy metabolite. None of these minor metabolites is pharmacologically active. Following oral administration of 14C-labelled rizatriptan, rizatriptan accounts for about 17% of circulating plasma radioactivity.

Excretion.

The plasma half-life of rizatriptan in males and females averages 2-3 hours. The pharmacokinetics of rizatriptan are linear in males and nearly linear in females following intravenous doses ≤ 60 microgram/kg. The plasma clearance of rizatriptan averages about 1000-1500 mL/min in males and about 900-1100 mL/min in females; about 20-30% of this is renal clearance. Following an oral dose of 14C-labelled rizatriptan, about 80% of the radioactivity is excreted in urine, and about 10% of the dose is excreted in faeces. This shows that the metabolites are excreted primarily via the kidneys.
After oral doses of 2.5 to 10 mg, the pharmacokinetics of rizatriptan are nearly linear. Consistent with its first pass metabolism, approximately 14% of an oral dose is excreted in urine as unchanged rizatriptan while 51% is excreted as indole acetic acid metabolite.
When rizatriptan 10 mg was administered every 2 hours for three doses on four consecutive days, the plasma concentrations of rizatriptan increased within each day, consistent with its t½, but no plasma accumulation of the drug occurred from day to day.

Characteristics in patients.

Gender.

The AUC of rizatriptan (10 mg orally) was about 25% lower in males as compared to females; Cmax was 11% lower, and Tmax occurred at approximately the same time. This apparent pharmacokinetic difference was of no clinical significance.

Elderly.

The plasma concentrations of rizatriptan observed in elderly subjects (age range 65 to 77 years) were similar to those observed in the young.

Hepatic impairment.

Following oral administration in patients with hepatic impairment caused by mild to moderate alcoholic cirrhosis of the liver, plasma concentrations of rizatriptan were similar to those seen in young male and female subjects.

Renal impairment.

In patients with renal impairment (creatinine clearance 10 - 60 mL/min/1.73 m2), the AUC of rizatriptan was not significantly different from that in healthy subjects. In haemodialysis patients, the AUC for rizatriptan was approximately 44% greater than that in patients with normal renal function. The maximal plasma concentration of rizatriptan in patients with all degrees of renal impairment was similar to that in healthy subjects.

5.3 Preclinical Safety Data

Genotoxicity.

Rizatriptan, with and without metabolic activation, was neither genotoxic, mutagenic, nor clastogenic in all in vitro and in vivo genetic toxicity studies, including: microbial mutagenesis, in vitro chromosome aberration assays, in vitro V-79 mammalian cell mutagenesis assays, an in vitro alkaline elution/rat hepatocyte assay, and an in vivo chromosome aberration assay in mouse bone marrow.

Carcinogenicity.

The carcinogenic potential of rizatriptan was evaluated in a 106 week study in rats and a 100 week study in mice at oral doses of up to 125 mg/kg/day. Exposure data were not obtained in those studies, but plasma AUC's of the parent drug were measured in other studies and indicate that exposures to the parent drug at the highest dose level would have been approximately 150 times (mice) and 240 times (rats) average AUC's measured in humans after three 10 mg doses, the maximum recommended daily dose. There was no evidence of an increase in tumour incidence related to rizatriptan in either species.

6 Pharmaceutical Particulars

6.1 List of Excipients

Mannitol, microcrystalline cellulose, calcium silicate, crospovidone, aspartame, colloidal anhydrous silica, silarom tropical flavour 1219410193 (peppermint flavour with ARTG No 109323) and magnesium stearate.

6.2 Incompatibilities

Incompatibilities were either not assessed or not identified as part of the registration of this medicine.

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. Store in original packaging.

6.5 Nature and Contents of Container

10 mg.

Supplied in PVC-OPA-Aluminium/Aluminium blister packs of 2, 3# or 6# tablets.
#Presentation not currently marketed.

6.6 Special Precautions for Disposal

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

6.7 Physicochemical Properties

Rizatriptan benzoate is a white to off-white, crystalline solid. The molecular weight of the benzoate salt is 391.47; the molecular weight of the free base is 269.4. Rizatriptan benzoate is soluble in water at about 42 mg per mL (expressed as free base) at 25°C.

Chemical structure.

N,N-dimethyl-5-(1H-1,2,4-triazol-1-ylmethyl)-1H-indole-3-ethanamine monobenzoate. Its empirical formula is C15H19N5.C7H6O2 and its structural formula is:

CAS number.

145202-66-0.

7 Medicine Schedule (Poisons Standard)

Prescription only medicine (S4).

Summary Table of Changes