UK Edition. Click here for US version.
ZYBAN 150MG PROLONGED RELEASE TABLETS
Active substance(s): BUPROPION HYDROCHLORIDE
PATIENT INFORMATION LEAFLET
Read all of this leaflet carefully before you start using this medicine
because it contains important information for you.
- Keep this leaflet. You may need to read it again.
- If you have any further questions, ask your doctor or pharmacist.
- This medicine has been prescribed for you only. Do not pass it on to
others. It may harm them, even if their signs of illness are the same as
- If you get any side effects, talk to your doctor or pharmacist. This includes
any possible side effects not listed in this leaflet. See section 4
Your medicine is available using the above name but will be referred to as
Zyban throughout the leaflet.
What is in this leaflet
1. What Zyban is and what it is used for
2. What you need to know before you take Zyban
3. How to take Zyban
4. Possible side effects
5. How to store Zyban
6. Contents of the pack and other information
1. WHAT ZYBAN IS AND WHAT IT IS USED FOR
Zyban is a medicine prescribed to help you stop smoking, when you also
have motivational support such as taking part in a ‘stop smoking’
Zyban will be most effective if you are fully committed to giving up
smoking. Ask your doctor or pharmacist for advice on treatments and other
support to help you stop.
2. WHAT YOU NEED TO KNOW BEFORE YOU TAKE ZYBAN
Don’t take Zyban:
- if you are allergic to bupropion or any of the other ingredients of this
medicine (listed in section 6)
- if you are taking any other medicines which contain bupropion
- if you have a condition that causes fits (seizures), such as epilepsy,
or if you have a history of fits
- if you have an eating disorder or had one in the past (for example,
bulimia or anorexia nervosa)
- if you have severe liver problems, such as cirrhosis
- if you have a brain tumour
- if you are usually a heavy drinker and you have just stopped drinking
alcohol, or are going to stop while you’re taking Zyban
- if you have recently stopped taking sedatives or medicines to treat
anxiety (especially benzodiazepines or similar medicines), or if you are
going to stop them while you’re taking Zyban
- if you have a bipolar disorder (extreme mood swings) as Zyban could
bring on an episode of this illness
- if you are taking medicines for depression or Parkinson’s disease
called monoamine oxidase inhibitors (MAOIs), or have taken them in the
last 14 days. The timing may be shorter for some types of MAOIs, your
doctor will advise you.
If any of these applies to you, talk to your doctor straight away, and
don’t take Zyban.
Warnings and Precautions
Talk to your doctor or pharmacist before taking Zyban. This is because
some conditions make it more likely that you will have side effects (see also
Children and adolescents
Zyban is not recommended for people under 18 years.
Zyban has been shown to cause fits (seizures) in about 1 in 1,000 people.
(See also Other medicines and Zyban later in this section and section 4
Possible side effects, for more information).
Fits are more likely:
- if you regularly drink a lot of alcohol
- if you have diabetes for which you use insulin or tablets
- if you have had a serious head injury or a history of head trauma
If any of these applies to you, don’t take Zyban unless you have agreed
with your doctor that there is a strong reason for doing so.
If you have a fit (seizure) during treatment:
taking Zyban and don’t take any more. See your doctor.
You may have more risk of side effects:
- if you have kidney or liver problems
- if you are aged over 65.
You will need to take a lower dose (see section 3) and be checked closely
while you are taking Zyban.
If you have had any mental health problems…
Some people taking Zyban have had hallucinations or delusions (seeing,
hearing or believing things that are not there), disordered thoughts or
extreme mood swings. These effects are more likely in people who have
had mental health problems before.
If you feel depressed or suicidal…
Some people become depressed when they try to stop smoking; very
occasionally, they may think about committing suicide, or try to do so.
These symptoms have affected people taking Zyban, most often in the first
few weeks of treatment.
If you feel depressed or think about suicide:
Contact your doctor or go to a hospital straight away.
High blood pressure and Zyban…
Some people taking Zyban have developed high blood pressure which
needs treatment. If you already have high blood pressure, it can become
worse. This is more likely if you are also using nicotine patches to help
you stop smoking.
You will have your blood pressure checked before you take Zyban
and while you are taking it, especially if you already have high blood
pressure. If you are also using nicotine patches, your blood pressure
needs to be checked every week. If your blood pressure increases, you
may need to stop taking Zyban.
Other medicines and Zyban
Tell your doctor or pharmacist if you are taking, have recently taken or
might take any other medicines, including medicines you bought without a
There may be a higher than usual risk of fits if you take:
- medicines for depression or other mental health problems (see also
Don’t take Zyban at the beginning of section 2)
- theophylline for asthma or lung disease
- tramadol, a strong painkiller
- medicines against malaria
- stimulants or other medicines to control your weight or appetite
- steroids (except creams and lotions for eye and skin conditions)
- antibiotics called quinolones
- some types of anti-histamines mainly used to treat allergies, that can
- medicines for diabetes.
If you take any medicines in this list, talk to your doctor straight
away, before you take Zyban (see section 3 under Some people need to
take a lower dose).
Some medicines can affect how Zyban works, or make it more likely
that you’ll have side effects. These include:
- medicines for depression (such as desipramine, imipramine, paroxetine)
or other mental health problems (such as risperidone, thioridazine)
- medicines for Parkinson’s disease (such as levodopa, amantadine or
- carbamazepine, phenytoin or valproate, to treat epilepsy or some
mental health problems
- some medicines used to treat cancer (such as cyclophosphamide,
- ticlopidine or clopidogrel, mainly used to treat heart disease or stroke
- some beta blockers (such as metoprolol), mainly used to treat high
- some medicines for irregular heart rhythm (such as propafanone,
- ritonavir or efavirenz, for treatment of HIV infection.
If you take any medicines on this list, check with your doctor. Your
doctor will weigh up the benefits and risks to you of taking Zyban, or may
decide to change the dose of the other medicine you are taking.
Zyban may make other medicines less effective:
- If you take tamoxifen used to treat breast cancer
If this applies to you, tell your doctor. It may be necessary to change to
another treatment for smoking cessation.
- If you take digoxin for your heart
If this applies to you, tell your doctor. Your doctor may consider adjusting
the dose of digoxin.
The dose of some medicines may need to be reduced when you stop
When you smoke, the chemicals absorbed into your body can cause some
medicines to be less effective. When you stop smoking, your dose of these
medicines may need to be reduced; otherwise, you may get side effects.
If you are taking any other medicines, check with your doctor if you notice
any new symptoms that you think may be side effects.
Zyban with alcohol
Some people find they are more sensitive to alcohol while taking Zyban.
Your doctor may suggest you do not drink alcohol while you’re taking
Zyban, or try to drink as little as possible. If you do drink a lot now, don’t
just stop suddenly, because that may put you at risk of having a fit.
Effect on urine tests
Zyban may interfere with some urine tests to detect other drugs. If you
require a urine test, tell your doctor or hospital that you are taking Zyban.
Pregnancy and breast-feeding
Don’t take Zyban if you are pregnant, think you may be pregnant or
are planning to have a baby. Ask your doctor or pharmacist for advice
before taking this medicine.
Some, but not all studies have reported an increase in the risk of birth
defects, particularly heart defects, in babies whose mothers were taking
Zyban. It is not known if these are due to the use of Zyban.
The ingredients of Zyban can pass into breast milk. You should ask your
doctor or pharmacist for advice before taking Zyban.
Driving and using machines
Some of the side effects of Zyban, such as feeling dizzy or light-headed,
may affect your concentration and judgement.
If you are affected, don’t drive or operate machinery.
3. HOW TO TAKE ZYBAN
Always take this medicine exactly as your doctor or pharmacist has
told you. Check with your doctor or pharmacist if you are not sure.
When to start and how much to take
- Start taking Zyban while you are still smoking.
- Set a Target Stop Smoking Day ideally during the second week
you’re taking it
Take one tablet (150 mg),
once a day
Increase your dose to one
tablet, twice a day, at least
8 hours apart, and not near
Days 1 to 6
Carry on taking one tablet, twice a day.
Stop smoking this week, on your Target Stop
Weeks 3 to 9
Carry on taking one tablet, twice a day for up to
If you have not been able to stop smoking after 7
weeks, your doctor will advise you to stop taking
You may be advised to stop taking Zyban
gradually, after 7–9 weeks.
Some people need to take a lower dose
as they may be more likely to get side effects.
- if you are aged over 65
- if you have liver or kidney disease
- if you have a higher risk of fits (see Warnings and Precautions and Other
medicines and Zyban in section 2)
the maximum recommended dose for you is one 150 mg tablet once a
How to take your tablets
Take your Zyban tablets at least 8 hours apart. Don’t take Zyban near
to bedtime - it may cause difficulty in sleeping.
You can take Zyban with or without food.
Swallow your Zyban tablets whole. Don’t chew
them, crush them or split them - if you do, the
medicine will be released into your body too
quickly. This will make you more likely to have
side effects, including fits.
If you take more Zyban than you should
If you take too many tablets, you may be more likely to have a fit or other
Don’t delay. Contact your doctor or your nearest hospital emergency
If you forget to take Zyban
If you miss a dose, wait and take your next tablet at the usual time.
Do not take a double dose to make up for a forgotten dose.
If you stop taking Zyban
You may need to take Zyban for as long as 7 weeks to have its full effect.
Don’t stop taking Zyban without talking to your doctor first. You may
need to reduce your dose gradually.
If you have any further questions about using this medicine, ask your doctor
4. POSSIBLE SIDE EFFECTS
Like all medicines, this medicine can cause side effects, although not
everyone gets them.
Approximately 1 in every 1,000 people taking Zyban is at risk of having a fit.
Symptoms of a fit include convulsions and usually loss of consciousness.
Someone who has had a fit may be confused afterwards and may not
remember what has happened.
Fits are more likely if you take too much, if you take some other medicines
or if you are at higher than usual risk of fits (see section 2).
If you have a fit, tell your doctor when you have recovered. Don’t take
any more Zyban.
Rarely (up to 1 in 1,000) people may have potentially serious allergic
reactions to Zyban. Signs of allergic reactions include:
- skin rash (including itchy, bumpy rash). Some skin rashes may need
hospital treatment, especially if you also have a sore mouth or sore eyes
- unusual wheezing, or difficulty in breathing
- swollen eyelids, lips or tongue
- pains in muscles or joints
- collapse or blackout.
If you have any signs of an allergic reaction, contact a doctor at
once. Don’t take any more tablets.
Very common side effects
These may affect more than one in 10 people:
- difficulty in sleeping (make sure you don’t take Zyban near to bedtime).
Common side effects
These may affect up to one in 10 people:
- feeling depressed (see also Warnings and Precautions in section 2)
- feeling anxious or agitated
- difficulty concentrating
- feeling shaky (tremor)
- feeling sick (nausea), being sick (vomiting)
- stomach pain or other upsets (such as constipation), changes in the taste
of food, dry mouth
- fever, dizziness, sweating, skin rash (sometimes due to an allergic
Uncommon side effects
These may affect up to one in 100 people:
- ringing in the ears, visual disturbances
- increase in blood pressure (sometimes severe), flushing
- loss of appetite (anorexia)
- feeling weak
- chest pain
- feeling confused
- rapid heartbeat.
Rare side effects
These may affect up to one in 1,000 people:
- fits (see the beginning of this section)
- twitching, muscle stiffness, uncontrolled movements, problems with
walking or coordination (ataxia)
- fainting, feeling faint when you stand up suddenly, because your blood
- feeling irritable or hostile; strange dreams (including nightmares)
- loss of memory
- tingling or numbness
- severe allergic reactions; rash together with joint and muscle pains (see
the beginning of this section)
- urinating (passing water) more or less than usual
- severe skin rashes that may affect the mouth and other parts of the body
and can be life-threatening
- worsening of psoriasis (thickened patches of red skin)
- your skin or the whites of your eyes turning yellow (jaundice), increase in
liver enzymes, hepatitis
- changes in blood sugar levels
- feeling unreal or strange (depersonalisation); seeing or hearing things
that are not there (hallucinations).
Very rare side effects
These may affect up to one in 10,000 people:
- feeling restless, aggressive
- sensing or believing things that are not true (delusions); severe
Other side effects
Other side effects have occurred in a small number of people but their
exact frequency is unknown:
- thoughts of harming or killing themselves while taking Zyban or soon after
stopping treatment (see section 2, What you need to know before you
take Zyban). If you have these thoughts, contact your doctor or go to a
hospital straight away
- loss of contact with reality and unable to think or judge clearly
(psychosis); other symptoms may include hallucinations and/or delusions.
- reduced number of red blood cells (anaemia), reduced number of white
blood cells (leucopenia) and reduced number of platelets
Effects of giving up smoking
People who stop smoking are often affected by nicotine withdrawal. This
can also affect people taking Zyban. Signs of nicotine withdrawal include:
- difficulty in sleeping
- tremor or sweating
- feeling anxious, agitated or depressed, sometimes with thoughts of
Talk to your doctor if you have any concerns about how you feel.
Reporting of side effects
If you get any side effects, talk to your doctor or pharmacist. This includes
any side effects not listed in this leaflet. You can also report side effects
directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard. By
reporting side effects you can help provide more information on the safety
of this medicine.
5. HOW TO STORE ZYBAN
- As with all medicines, it is important to keep Zyban out of the sight and
reach of children.
- Do not store Zyban above 25oC. Store in the original pack.
- Do not use Zyban after the expiry date printed on the carton or the foil
- If you have any Zyban tablets left after completing your course of
treatment, please return them to your pharmacist who will get rid of them
If the tablets become discoloured or show any other signs of deterioration,
seek the advice of a pharmacist
6. CONTENTS OF THE PACK AND OTHER INFORMATION
What Zyban contains
Each tablet contains 150 mg of the active substance, bupropion
Zyban also contains the following inactive ingredients: microcrystalline
cellulose, hypromellose, cysteine hydrochloride monohydrate, magnesium
stearate, macrogol 400, titanium dioxide (E171), carnauba wax and black
What Zyban looks like and contents of the pack
Zyban tablets are available as white, film-coated, biconvex, round tablet
printed on one side with GX CH7 and plain on the other side and comes in
blister strips, each containing 10 tablets in a pack of 30 or 60 tablets.
Manufacturer and Product licence holder
Zyban is manufactured by GlaxoSmithKline Pharmaceuticals S.A., UL.
Grunwaldzka 189, Poznan, 60-322 Poland. Procured from within the EU by
Product Licence holder: Star Pharmaceuticals Ltd, 5 Sandridge Close,
Harrow, Middlesex HA1 1XD. Repackaged by Servipharm Ltd.
Leaflet revision and issue date (Ref.) 04.11.16
Zyban and the Zyban logo are registered trademarks of the
GlaxoSmithKline group of companies.
Source: Medicines and Healthcare Products Regulatory Agency
Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.