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Mirtazapine 30 mg and 45 mg tablets
Consumer Medicine Information
This leaflet answers some common questions about Mirtazon. It does not contain all the available information. It does not take the place of talking to your doctor or pharmacist.
All medicines have risks and benefits. Your doctor has weighed the risks of you taking Mirtazon against the benefits they expect it will have for you.
If you have any concerns about taking this medicine, ask your doctor or pharmacist.
Keep this leaflet with the medicine. You may need to read it again.
Mirtazon is used in the treatment of depression including relapse prevention.
Depression is longer lasting or more severe than "low moods" everyone has from time to time due to the stress of everyday life. It is thought to be caused by a chemical imbalance in parts of the brain. This affects your whole body and can cause emotional and physical symptoms such as feeling low in spirit, loss of interest in activities, unable to enjoy life, poor appetite or overeating, disturbed sleep, often waking up early, loss of sex drive, lack of energy and feeling guilty over nothing.
This medicine corrects this chemical imbalance and may help relieve the symptoms of depression.
Your doctor, however, may prescribe it for another purpose.
Ask your doctor if you have any questions about why this medicine has been prescribed for you. This medicine is only available with a doctor's prescription.
Mirtazon is not addictive.
Do not take Mirtazon:
Some of the symptoms of an allergic reaction may include skin rash, itching or hives, swelling of the face, lips, mouth, throat or other parts of the body, shortness of breath, wheezing or trouble breathing.
Do not take Mirtazon if you are taking another medicine for depression called a monoamine oxidase inhibitor (MAOI) or have been taking an MAOI within the last 14 days. If you stop taking Mirtazon, do not take MAOI during the next two weeks either. Taking Mirtazon with an MAOI may cause a serious reaction with a sudden increase in body temperature, extremely high blood pressure and severe convulsions.
Examples of this type of medicine include phenelzine, tranylcypromine and selegiline.
Ask your doctor or pharmacist if you are not sure if you are or if you have been taking a MAOI medicine.
Do not take Mirtazon if the packaging is torn or shows signs of tampering.
Do not take Mirtazon if the expiry date printed on the pack has passed.
If you are not sure whether you should start taking this medicine, talk to your doctor.
Do not give Mirtazon to a child or adolescent. The safety of Mirtazon in patients under 18 years has not been established.
Tell your doctor if:
If you have not told your doctor about any of the above, tell them before you take Mirtazon.
Tell your doctor if you react badly to lactose or milk before you start taking Mirtazon. Mirtazon tablets contain lactose.
Tell your doctor or pharmacist if you are taking any other medicines, including any that you buy without a prescription from your pharmacy, supermarket or health food shop.
Some medicines may be affected by Mirtazon or may affect how well it works. These include:
Your doctor will tell you what to do if you are taking any of these medicines.
Your doctor and pharmacist may have more information on medicines to be careful with or avoid while taking Mirtazon
If you are not sure whether you are taking any of these medicines, check with your doctor or pharmacist.
Follow all directions given to you by your doctor or pharmacist. They may differ from the information contained in this leaflet.
Your doctor will tell you how much Mirtazon to take each day. Take exactly the amount your doctor tells you. The usual starting dose is 15mg per day. Your doctor may slowly increase this dose depending on how you respond to Mirtazon. The effective dose for most people is usually between 30 mg and 45 mg per day.
Your doctor may have prescribed a different dose.
If you do not understand the instructions on the box, ask your doctor or pharmacist for help.
Take Mirtazon at about the same time each day. Your doctor will tell you when to take your tablets.
The tablet(s) should be taken at the same time each day, preferably as a single night-time dose before going to bed; if recommended by your doctor, Mirtazon may be taken in sub-doses equally divided over the day (once in the morning and once at night-time before going to bed).
Swallow the tablet(s), without chewing, together with some water or other fluid.
Keep taking Mirtazon until your doctor tells you to stop. For depression, the length of treatment will depend on how quickly your symptoms improve. Most antidepressants take time to work, so do not be discouraged if you don't feel better right away. Some of your symptoms may improve in 1 to 2 weeks but it can take up to 2 - 4 weeks to feel the full benefit of the medicine.
Even when you feel well, you will usually have to take Mirtazon for 4 to 6 months or even longer to make sure the benefits will last.
ONCE DAILY DOSING
If you forget to take the tablet before you go to bed, do not take the missed dose next morning. It may cause drowsiness or sleepiness during the day. Continue treatment in the evening with your normal dose.
TWICE DAILY DOSING
If you have trouble remembering to take your medicine, ask your pharmacist for some hints.
Immediately telephone your doctor or the Poisons Information Centre (telephone 13 11 26) for advice, or go to Accident and Emergency at your nearest hospital if you think you or anyone else may have taken too much Mirtazon. Do this even if there are no signs of discomfort or poisoning. You may need urgent medical attention.
If you take too many Mirtazon tablets, you may feel drowsy, dizzy, confused, and agitated.
You may also have changes to your heart rhythm (fast, irregular heartbeat) and/or fainting which could be symptoms of a life-threatening condition known as Torsade de Pointes.
Tell your doctor immediately if you develop fever, chills, sore throat or mouth ulcers or other signs of frequent infections. In rare cases Mirtazon can cause a shortage of white blood cells, resulting in lowering body resistance to infection. These symptoms may appear after 2 - 6 weeks of treatment.
Tell your doctor immediately or go to the nearest hospital for treatment if you have any suicidal thoughts or other mental/mood changes. Occasionally, the symptoms of depression or other psychiatric conditions may include thoughts of harming yourself or committing suicide. Until the full antidepressant effect of your medicine becomes apparent, it is possible these symptoms may increase in the first few weeks of treatment.
Information from clinical trials have shown an increased risk of suicidal behaviour in young adults aged less than 25 years with psychiatric conditions who were treated with an antidepressant.
If you or someone you know is showing warning signs of suicide-related behaviour while taking Mirtazon, contact your doctor or a mental health professional right away or go to the nearest hospital for treatment. These signs include:
All mentions of suicide or violence must be taken seriously.
You may find it helpful to tell a relative or close friend that you are depressed, and ask them to read this leaflet. You might ask them to tell you if they think your depression is getting worse, or if they are worried about changes in your behaviour.
Tell your doctor if you become pregnant while taking this medicine. Do not stop taking your tablets until you have spoken to your doctor.
If you use Mirtazon until, or shortly before birth, your baby should be supervised for possible adverse effects.
Ask your doctor whether you can breast-feed, while taking Mirtazon.
Tell your doctor if for any reason you have not taken your medicine exactly as prescribed. Otherwise your doctor may think that it was not effective and change your treatment unnecessarily.
Tell your doctor if you feel the tablets are not helping your condition.
Be sure to keep all of your appointments with your doctor so that your progress can be checked. You may need to have blood tests from time to time.
Before starting any new medicine, tell your doctor or pharmacist that you are taking Mirtazon.
Tell all doctors, dentists and pharmacists who are treating you that you are taking Mirtazon.
Do not drive or operate machinery until you know how Mirtazon affects you. Mirtazon may cause drowsiness, dizziness or sleepiness in some people and affect alertness and concentration. If any of these occur, do not drive, operate machinery or do anything else that could be dangerous.
Do not suddenly stop taking Mirtazon, or lower the dose, without first checking with your doctor.
Do not let yourself run out of medicine over the weekend or on holidays.
Do not stop taking Mirtazon, even if you feel better, unless advised by your doctor. Suddenly stopping Mirtazon may cause nausea, headache, dizziness, anxiety, agitation.
Your doctor may want to gradually reduce the amount of Mirtazon you are taking before stopping completely.
Do not use Mirtazon to treat any other conditions unless your doctor tells you to.
Do not give this medicine to anyone else, even if their symptoms seem similar to yours or if they have the same condition as you.
You are advised not to drink any alcohol taking Mirtazon. Combining Mirtazon and alcohol can make you sleepy and less alert. Your doctor may suggest you avoid alcohol while being treated with this medicine.
Tell your doctor or pharmacist as soon as possible if you do not feel well while you are taking Mirtazon. Mirtazon helps most people with depression, but it may have unwanted side effects in a few 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.
Ask your doctor or pharmacist any questions you may have.
Do not be alarmed by this list of possible side effects. You may not experience any of them.
Tell your doctor if you notice any of the following and they bother you:
*May be symptoms of depression
Tell your doctor immediately, or go to the Accident and Emergency at your nearest hospital if you notice any of the following:
Other side effects not listed above may also occur in some patients. Tell your doctor if you notice anything else that is making you feel unwell.
Ask your doctor or pharmacist if you don't understand anything in this list.
Keep your tablets in their blister pack until it is time to take them. The tablets may not keep as well if you take them out of the blister pack.
Store below 30°C in a dark, dry place.
Do not store Mirtazon, or any other medicine, in a bathroom or near a sink. Do not leave it in the car or on window sills. Heat and dampness can destroy some medicines.
Keep this medicine where young children cannot reach it. A locked cupboard at least one-and-a half metres above the ground is a good place to store medicines.
Return any unused medicine to your pharmacist.
Medicines should not be disposed of via waste water or household waste.
Mirtazon is available in two strengths: 30 mg and 45 mg.
The medicine is packed in child-resistant blisters.
Pack size: blister packs of 30 tablets.
Merck Sharp & Dohme (Australia) Pty Limited
54-68 Ferndell Street,
South Granville, NSW 2142
Aspen Pharma Pty Ltd
34-36 Chandos Street
St Leonards NSW 2065 Australia
Australian Registration Numbers
AUST R 82941 (30 mg)
AUST R 121869 (45 mg)
This leaflet was updated in December, 2013.
RA 106CCPPI 8 (ref 10.0)
Published by MIMS/myDr March 2014
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