Skip to Content

UK Edition. Click here for US version.



PDF options:  View Fullscreen   Download PDF

PDF Transcript

Package Leaflet: Information for the User

Zyban 150 mg prolonged release film-coated tablets
(bupropion hydrochloride)
Read all of this leaflet carefully before you start using this
medicine because it contains important information for you.
Your medicine is called Zyban 150 mg prolonged release film-coated
tablets but throughout this leaflet will be referred to as Zyban.


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 yours.
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

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
 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 section 4).
Children and adolescents
Zyban is not recommended for people under 18 years.
Fits (seizures)
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:
 Stop 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 prescription.
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 cause sleepiness
 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 orphenadrine)
 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
 some beta blockers (such as metoprolol), mainly used to treat
high blood pressure
 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 smoking
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
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
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
Week 1
Days 1 to 6
Take one tablet (150 mg),
once a day
Ideally keep
Day 7
Increase your dose to one
smoking while
tablet, twice a day, at least
taking Zyban
8 hours apart, and not near
to bedtime
Week 2
Carry on taking one tablet, twice a day.
Stop smoking this week, on your Target Stop
Smoking Day.
Weeks 3 to 9
Carry on taking one tablet, twice a day for
up to 9 weeks.
If you have not been able to stop smoking
after 7 weeks, your doctor will advise you to
stop taking Zyban.
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 day.
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 side effects.
 Don’t delay. Contact your doctor or your nearest hospital
emergency department immediately.
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
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 or pharmacist.
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not
everyone gets them.
Fits (seizures)
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.
Allergic reactions
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
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)
 headache
 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
reaction), itching.
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)
 palpitations
 fainting, feeling faint when you stand up suddenly, because your
blood pressure falls
 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
suspiciousness (paranoia).
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
 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
 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, pharmacist or nurse.
This includes any possible side effects not listed in this leaflet.
You can also report side effects directly via the Yellow Card Scheme
By reporting side effects, you can help provide more information on the
safety of this medicine.
5. How to store Zyban
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the
pack. The expiry date refers to the last day of that month.
Do not store this medicine above 25°C.
Store it in the original package.
Do not throw away medicines via wastewater or household waste. Ask
your pharmacist how to throw away medicines you no longer use.
These measures will help to protect the environment.
If your tablets become discoloured or show any signs of deterioration,
return to your pharmacist who will advise you.
6. Contents of the pack and other information
What Zyban contains
Each tablet contains 150 mg bupropion hydrochloride.
The other ingredients are:
microcrystalline cellulose, hypromellose, cysteine hydrochloride
monohydrate, magnesium stearate, titanium dioxide (E171),
macrogol 400, carnauba wax, black ink, (purified water, iron oxide
black (E172), isopropyl alcohol, propylene glycol (E1520),
hypromellose (2910 6cP (E464)).
What Zyban looks like and contents of the pack
Zyban 150 mg tablets are white, film-coated, biconvex, round tablets
imprinted with ‘GX CH7’ in black ink on one side and plain on the
They are available in cartons of 30 and 60 tablets.
Manufacturer: GlaxoSmithKline Pharmaceuticals S.A.,
Grunwaldzka, Poznan, Poland.
Procured within the EU.
Product Licence holder: Ecosse Pharmaceuticals Limited,
3 Young Place, East Kilbride G75 0TD.
Re-packaged by: Munro Wholesale Medical Supplies Limited,
3 Young Place, East Kilbride G75 0TD.
PL 19065/0486


This leaflet was approved 12/10/2016
Useful contacts
A number of organisations exist that can offer support now that you
have decided to stop smoking. Contact details of some of these
organisations are given below:
NHS Stop Smoking Service -
Action on Smoking and Health (ASH)

Zyban® is a registered trade mark of GSK Group of companies

+ Expand Transcript

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.