Zyban (Bupropion)

Zyban (Bupropion) – Patient Information for Australia

Basic Product Information

Mechanism of Action

For Patients: Zyban (bupropion) is a medicine that works on the chemicals in your brain, mainly dopamine and noradrenaline. It helps to reduce cravings and withdrawal symptoms when you are trying to quit smoking.
For Specialists: Bupropion is a dual norepinephrine-dopamine reuptake inhibitor (NDRI) with minimal direct effect on serotonin reuptake. Its efficacy in smoking cessation and depression is thought to derive from central noradrenergic and dopaminergic modulation.

Pharmacokinetics

• Absorption: Well absorbed orally; peak plasma concentrations are reached within 3 hours of dosing (T_max ~2–3 h).
• Metabolism: Extensively metabolised in the liver (CYP2B6 pathway) to several active metabolites, mainly hydroxybupropion.
• Elimination: Mostly renal (urine), minor faecal route.
• Biological Half-life: Parent drug ~21 hours; active metabolites 20–37 hours.
• Duration of Action: Once-daily or twice-daily sustained-release dosing allows round-the-clock effect.

Use in Everyday Life & Best Practices

Typical Use: Zyban is most commonly used in Australia as an aid to stop smoking in adults. Treatment is usually part of a structured quit-smoking program with behavioural support. Your doctor will help set a quit date, usually one to two weeks after starting Zyban.
Dose: Start with 150 mg daily for three days, then increase to 150 mg twice daily. The tablets should be swallowed whole and never crushed or chewed, as this may increase the risk of side effects. Treatment duration is usually 7–9 weeks. Always follow your doctor’s instructions.

Dosing: Morning vs Evening

• Morning Dosing: The first dose is commonly taken in the morning to reduce risk of insomnia.
• Evening Dosing: Second daily dose (if prescribed) should be taken at least 8 hours after the first dose, ideally in the afternoon and not close to bedtime, as bupropion may cause trouble sleeping.
• Tips: Set a daily reminder, take doses at the same times each day, and avoid late evening doses.

Taking With Food or on an Empty Stomach

Zyban can be taken with or without food. However, taking it with food may help reduce stomach discomfort, which can be helpful for patients eating a typical English or Australian diet. Avoid breaking or crushing the tablet even if taken with food. Avoid high-fat or spicy foods if you are prone to stomach side effects.

Interaction Warnings

Before starting Zyban, inform your doctor about all medicines, supplements, and herbal products you are taking. Significant interactions include:

Indications

Dosing According to Clinical Indication

Safety Profile / Side Effects

• Insomnia (trouble sleeping)
• Dry mouth
• Headache
• Nausea or diarrhoea
• Dizziness
• Increased sweating
• Weight loss

• Seizures (convulsions) – risk increased in people with certain medical conditions or with excess alcohol intake
• Skin reactions (rash, hives, itching, swelling)
• Raised blood pressure
• Allergic reactions (anaphylaxis, angioedema)
• Mood changes or suicidal thoughts (uncommon; seek medical help immediately if this occurs)

• Do not use if you have epilepsy or a history of seizures
• Not recommended for anyone with an eating disorder, such as bulimia or anorexia nervosa
• Discuss any liver or kidney problems with your GP or pharmacist before starting
• Check with your doctor before using if you are pregnant, planning a pregnancy, or breastfeeding

Guidelines for Proper Use (Advice from Australian Pharmacists)

• Always take Zyban exactly as prescribed by your doctor
• Choose a consistent time each day for your doses
• Do not stop suddenly without consulting a healthcare professional
• Never take more than the prescribed dose (risk of seizures increases with higher doses)
• Store at room temperature, out of reach of children
• If you forget a dose, do not double the next one; simply take your next scheduled dose as usual
• Let your friends/family know you’re using Zyban, especially if you live alone (rare risk of severe side effects)
• Report any skin rash, mental health changes, or severe headaches to your doctor promptly
• Let your pharmacist and dentist know you are on bupropion before having surgery or dental treatment

Alternative Treatment Options (Subsidised by PBS)

* Nortriptyline is not officially approved for smoking cessation but is sometimes used off-label when other medications are not suitable.

Legal, Registration & Reimbursement Status in Australia

• Registered in Australia by the Therapeutic Goods Administration (TGA)
• Prescription only (Schedule 4)
• Zyban 150 mg tablets are listed on the PBS (Pharmaceutical Benefits Scheme) for eligible adults attempting to quit smoking, with specific restrictions
• PBS subsidy applies for one course per patient per 12-month period
• Not approved for use in children or adolescents

Latest Research & Clinical Guidance (2022–2025)

• According to the Australian National Tobacco Strategy 2022–2025 and RACGP (Royal Australian College of General Practitioners) 2023 guidelines, combination treatments (for example, NRT + bupropion) improve quit rates, especially with behavioural support (RACGP Smoking Cessation Guidelines 2023).
• A 2024 meta-analysis in The Lancet Respiratory Medicine confirms Zyban’s effectiveness is similar to varenicline, both improving quit rates compared to placebo.
• RACGP stresses the importance of assessing patient history, especially seizure and psychiatric risk, before prescribing bupropion.
• Recent studies suggest that combination with NRT is safe under specialist supervision but not routinely required.

Availability and Delivery

Check with your pharmacist for accurate prices and delivery estimates closer to your purchase date.

FAQ – Common Patient Questions

1. Is Zyban effective for quitting smoking?
   Yes, clinical trials and Australian guidelines show Zyban can nearly double the chance of quitting successfully compared to willpower alone, especially when combined with counselling or support services.
2. Can I take Zyban if I have depression?
   Bupropion is not routinely prescribed for depression in Australia. If you have a history of depression, discuss this with your doctor before starting Zyban.
3. What do I do if I miss a dose?
   Take the next dose at your usual scheduled time. Do not take two doses close together as this increases side effect risks.
4. Is it safe to use Zyban with other quit-smoking products?
   Zyban can sometimes be used with certain types of nicotine replacement therapy (such as patches), but this combination should be closely monitored by your doctor.
5. Who should NOT use Zyban?
   Zyban is not suitable for anyone with a history of seizures, certain eating disorders, or those taking specific antidepressants (MAOIs). Always consult your doctor before starting.

For further information, consult your GP, pharmacist, or the Australian Quitline (13 7848). This guide does not replace personalised medical advice.