Duloxetine (Cymbalta) for major depression

Published in Medicine Update

Date published: About this date

Health and medicines information in this article may have changed since the date published. This information does not replace advice from a health professional.

This Medicine Update is for people who are taking duloxetine or are thinking about starting it.

Summary

Duloxetine is a new antidepressant which we believe to be as effective as, but no better than, any other antidepressant. Its side effects are not fully known. It may be useful for some people.

The choice of which antidepressant to use depends on many factors, including:

  • the type of depression you have
  • your general health and medical condition
  • your current medications
  • how important different side effects may be to you.

While antidepressants are a helpful part of treatment for many people, psychological treatments and other non-drug elements (e.g. exercise, sleep) play an important role in managing depression, whether or not medicines are used.

Contents


What duloxetine is

The active ingredient is duloxetine, pronounced due-LOKS-e-teen. The brand name is Cymbalta, pronounced sim-BAL-tah.


What duloxetine treats

Duloxetine treats major depressive disorder, or major depression. Major depressive disorder is not simply a case of the blues. It is a serious illness which involves some or all of the following symptoms most of the time:

  • feeling down
  • sleeping badly
  • losing interest in things you normally enjoy
  • losing or gaining weight
  • having difficulty moving
  • being very tired
  • feeling guilty
  • finding it hard to concentrate
  • having thoughts of death.

Not all major depressions are the same — there are different types. People with a particular type of major depression may be more likely to benefit from one type of antidepressant than another. But there are no hard and fast rules.

For some people, getting on the right antidepressant is a matter of using one, giving it 6 weeks, and changing it if it does not help. All this requires close medical supervision — do not start, change or stop antidepressants without medical advice.


How duloxetine works

Duloxetine is thought to work by affecting the balance of different chemicals in the brain.

Like all antidepressants, duloxetine takes time to work. It may take 2–3 weeks to have its full effect. It works best if used for 6 months or longer.

Like all antidepressants, duloxetine works in about half the people who use it. For the rest, it will have no benefit.

It may take time to find the best antidepressant for you.


Who can use duloxetine

You can use this medicine if you have been diagnosed with depression and are prescribed it by a doctor.

Do not use duloxetine if you are under 18 years. Do not use anybody else’s duloxetine, and do not give yours to anybody else.


Other medicines available for this condition

Many other medicines are available to treat major depression. They all work by affecting the balance of chemicals in the brain, which are believed to contribute to the physical and psychological symptoms of depression.

These antidepressants are all about as effective as each other. But some people will benefit from one antidepressant and not another. It is difficult to predict who may benefit from which medicine.

Antidepressants can be grouped as follows.

Selective serotonin reuptake inhibitors (SSRIs)

SSRIs have been available for more than 20 years. They are the most commonly used antidepressants. They are no more effective than others, but usually cause fewer side effects. They include:

  • citalopram (e.g. Celapram)
  • escitalopram (e.g. Lexapro)
  • fluoxetine (e.g. Prozac)
  • fluvoxamine (e.g. Luvox)
  • paroxetine (e.g. Aropax)
  • sertraline (e.g. Zoloft).

Serotonin and noradrenaline reuptake inhibitors (SNRIs), which includes duloxetine

SNRIs are a slightly newer class of medicines. The first one available was venlafaxine (Efexor).  Duloxetine is an SNRI like venlafaxine.

Tricyclic antidepressants

Tricyclic antidepressants have been available for more than 40 years. They include:

  • amitriptyline (e.g. Endep)
  • clomipramine (e.g. Anafranil)
  • dothiepin (e.g. Prothiaden)
  • doxepin (e.g. Sinequan)
  • imipramine (e.g. Tofranil)
  • nortriptyline (e.g. Allegron)
  • trimipramine (e.g. Surmontil).

Tricyclic antidepressants are just as effective as SSRIs and SNRIs, but they usually cause more side effects.

Other antidepressants

Other antidepressants include:

  • mianserin (Tolvon)
  • mirtazapine (e.g. Avanza)
  • moclobemide (e.g. Aurorix)
  • reboxetine (e.g. Edronax)
  • phenelzine (Nardil)
  • tranylcypromine (Parnate).

The treatment options for major depression include not just medication, but also lifestyle changes, counselling and electroconvulsive therapy (for very severe depression). See Other ways to help this condition for details.


How well duloxetine works compared with other medicines

Clinical trials indicate that duloxetine is as effective as some other antidepressants in reducing  depression. There is no evidence to say duloxetine is better than other antidepressants.

It may be worth trying duloxetine if your symptoms have not improved with other antidepressant medicines. However, there is no reason to believe it will be more effective than other medicines whose benefits and side effects are better known.

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Important side effects of duloxetine to consider

Ask your health professional about the possible side effects of this medicine before you take it. Always tell them about any changes to your condition if you're taking a new medicine.

To report possible side effects call the NPS Adverse Medicine Events (AME) Line on 1300 134 237 from anywhere in Australia (Monday–Friday, 9am–5pm AEST).

People with questions about their medicines or seeking general information about side effects can call the NPS Medicines Line on 1300 633 424 (Monday–Friday, 9am–5pm AEST).

Duloxetine is a new medicine to Australia, but has been available in the US and the UK for several years.

The side effects that have most commonly shown up in clinical trials of duloxetine include:

  • nausea (especially when starting to use the medicine)
  • constipation
  • trouble sleeping
  • dizziness.

Other side effects to be aware of include headaches and loss of sex drive. Duloxetine may increase blood pressure slightly.

Some people may have no side effects.

For a more complete list of possible side effects for Cymbalta (duloxetine), see the consumer medicine information (CMI) leaflet available on our Medicines Finder page.

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How the side effects of duloxetine compare with other medicines

Remember that benefits and side effects differ between medicines and from person to person.

All antidepressants have some significant and potentially serious side effects and others that are less serious.

These side effects differ between antidepressants and between people — some people get very few side effects. You need to discuss your health and any other conditions with your doctor when considering antidepressants. Discuss with your doctor the benefits and risks of taking (and not taking) antidepressants.

Side effects will be considered in the groups described in Other medicines available for this condition.

Selective serotonin reuptake inhibitors (SSRIs)

SSRIs commonly cause:

  • nausea
  • agitation
  • trouble sleeping
  • drowsiness
  • sexual difficulties.

Serotonin and noradrenaline reuptake inhibitors (SNRIs)

Venlafaxine has similar side effects to duloxetine:

  • nausea (especially when starting to use the medicine)
  • constipation
  • trouble sleeping
  • dizziness.

Both medicines may also increase blood pressure slightly.

Tricyclic antidepressants

Tricyclic antidepressants commonly cause:

  • sleepiness
  • a dry mouth
  • blurred vision
  • constipation
  • weight gain.

Others

Phenelzine (Nardil) and tranylcypromine (Parnate) may cause:

  • low blood pressure
  • sleeping problems
  • headaches
  • drowsiness.

They should be avoided, if possible, by people with heart disease or who have had a stroke.

A special diet (avoiding, for example, cheese and red wine) must be adhered to.

Side effects with most or all antidepressants

For all people taking antidepressants, there is also the risk of suicidal thoughts. These occur more often than usual in the period soon after people start taking antidepressants, partly because people starting to use antidepressants are at a very low point.

If suicidal thoughts do get worse, then seek help urgently from your GP, psychiatrist, local hospital or Lifeline (call 13 11 14).

Is it the medicine or is it the depression?

This difficult question exists for many side effects. Trouble sleeping — is that the depression or the medicine? Loss of sexual function — depression or medication? Sometimes it can be difficult to tell, but you should discuss any problems that worry you with your GP or psychiatrist.

Most antidepressants interact with other medications — you need to discuss with your doctor all the medicines you use, including herbal and natural medicines.

If you are pregnant, breastfeeding or thinking about becoming pregnant, side effects become even more important. You should ask for specialist advice about medicines, either directly or through your GP or antenatal clinic.

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How to reduce your risk of side effects from duloxetine

There are a number of ways to reduce your risk of side effects when taking duloxetine. Your doctor or pharmacist should be able with advice on how to reduce the risk of side effects.

If you get an upset stomach, try taking duloxetine with food. Avoid alcohol or minimise the amount you drink — alcohol and duloxetine don’t mix well.

Many people find nausea and some other side effects are worse when starting the medicine. The nausea usually settles down within the first week. These side effects can be reduced by taking a smaller dose for the first week. However, a lower dose for the first week may delay the medicine becoming fully effective.

It is important to see your doctor 6 weeks after starting duloxetine, and discuss stopping it if it isn’t working.

Stopping duloxetine suddenly can also cause side effects. Do not stop duloxetine suddenly — the dose should be reduced gradually over a period of weeks.

Even when coming off the medicine gradually, some people will find they have trouble sleeping and may feel dizzy, nauseous or anxious. These effects will usually pass within a week or two.

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What else you should know about duloxetine

Please note that changing antidepressants requires careful medical supervision. Different antidepressants can interact with each other, and sometimes there needs to be a gap of 2–3 weeks after taking one medicine before starting another.

If you are considering changing antidepressants, you should do so only under medical supervision.

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What does duloxetine cost?

If you are prescribed duloxetine through the Pharmaceutical Benefits Scheme (PBS), you pay only the cost of a normal prescription, and the Australian Government pays the rest.

The full cost to the Australian Government of each duloxetine 60 mg prescription is $49.99, which is slightly higher than most other antidepressants.

At the time of publication, the cost of a normal prescription through the PBS was:

  • $31.30 for people without a concession card
  • $5.00 for concession card holders.

Each prescription lasts 28 days, and you can get up to 5 repeats of duloxetine 60 mg.

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Other ways to help this condition

There are many ways to help deal with major depression. They can contribute towards easing the depression, and may help reduce the amount of medicine required. These involve:

  • sleep
  • exercise
  • healthy eating
  • avoiding alcohol and other drugs
  • counselling or other psychological treatments.

Sleep is very important. Poor sleep can be a sign of depression, and getting a decent night’s rest can be part of the road to recovery. Sleep can improve with:

  • getting to bed at about the same time each night
  • getting up at about the same time each day
  • avoiding caffeine after lunch
  • having a good relaxing night-time routine, which may involve reading and relaxation before bed.

Many people who feel depressed also feel very tired. Exercise can help break the cycle. Regular exercise, even a 30 minute walk most days, can help people feel more energetic, and help improve sleep.

Healthy eating will not bring about an instant fix, but it is part of establishing the healthy lifestyle that will contribute towards a recovery from depression.

If you have depression, then drinking alcohol will probably make it worse. If you are more than a light drinker, you should not use duloxetine.

Some illicit drugs can cause serious side effects if used with duloxetine. Ask your GP, psychiatrist, pharmacist or psychologist for more information about the specific risks with particular drugs.

Many forms of counselling or psychological treatment are effective for people with depression. For people with mild depression, they can be effective on their own. For people with moderate to severe major depression, they are usually used in addition to medication, and may improve the effectiveness of antidepressants. Treatment may be available through Medicare.

Electroconvulsive therapy, or ECT, is a useful treatment for people with very severe depression, and is sometimes lifesaving. It has a poor reputation based on the way it was used some decades ago. But ECT is now recommended as an effective option for people with very severe depression who are at risk of dying from suicide or through not eating or drinking.

For more information contact:

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How new medicines are tested and approved for use in Australia

Prescription medicines go through many tests and clinical trials before they can be prescribed in Australia. All medicines go through four types of tests to assess their effectiveness, side effects and safety:

  • laboratory tests (not involving people)
  • phase 1 clinical trials, typically with 20–80 healthy volunteers, to test the safety and dosage in people with normal physical health
  • phase 2 clinical trials, typically with 100–500 volunteers with the condition, to test the effectiveness and safety
  • phase 3 clinical trials, typically with 1000–3000 volunteers with the condition, to confirm the medicine’s effectiveness and find out more about its side effects.

Sometimes, less common side effects do not become obvious until large numbers of people have used the medicine.

The Therapeutic Goods Administration (Australia’s regulatory agency for medicines) checks clinical trial results before it approves the registration of the medicine for use in Australia.

Medicines are made available on the Pharmaceutical Benefits Scheme (PBS)if they are shown to be as good as or better than other available medicines for the same condition.

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Where to find more information about duloxetine

You can find more information in the consumer medicine information (CMI). This will tell you:

  • who should not use the medicine
  • which other medicines should be avoided
  • how to take the medicine
  • most of the possible side effects
  • the ingredients.

You can get the CMI leaflet for Cymbalta from:

Information over the phone

NPS works with healthdirect Australia to provide the NPS Medicines Line phone service for consumers.

To get more information about any medicine call 1300 MEDICINE (1300 633 424). This service is available from anywhere in Australia, Monday to Friday, 9am to 5pm AEST excluding NSW public holidays.

To report a side effect

Call the NPS Adverse Medicine Events (AME) Line on 1300 134 237, Monday to Friday, 9am to 5pm AEST excluding public holidays.

The AME Line is a service where you can report possible side effects of your medicine and contribute to national medicine safety efforts. Information on medicine-related side effects is passed on to the Therapeutic Goods Administration (TGA) for assessment, but your personal details will remain confidential and your privacy maintained.

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