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Zyban

Stop Smoking|Active ingredient(s): Bupropion|Manufacturer: GSK

A close-up of a woman snapping a cigarette in half.

Quit smoking for good: crush cravings with clinically proven treatment

  • Targets cravings and makes smoking less pleasurable
  • 1 in 5 quit a year post-treatment
  • 7-9 week treatment course
  • No risk of weight gain

How to take

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Dosage schedule

Start by taking one Zyban tablet once daily for 6 days. On the 7th day, you increase to one tablet twice daily.

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Pick a quit date

You should pick a Target Stop Smoking Day in week 2 of your treatment. Try and stick to it - you got this!

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When to take

You should allow 8 hours between each dose. Do not take doses too close to bedtime, as this can cause side effects.

What others say about Zyban

Trustpilot review
9 reviews with score 4.8

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Zyban

What is Zyban?

Zyban is an effective treatment that helps you quit smoking. It was the first non-nicotine-based therapy to be launched in the EU. Since receiving approval in 2000, it has helped many quit smoking for good.

Zyban is available as prolonged-release tablets. This means the medicine releases more gradually into the body, reducing the risk and severity of potential side effects.

How does Zyban work?

When you smoke, the nicotine causes your brain to release dopamine, which is informally known as the “happy hormone”. This is one factor that makes smoking addictive and difficult to quit by yourself.

The Zyban pill contains Bupropion, which works by targeting this addictive cycle. It prevents your nerve cells from absorbing dopamine and another neurotransmitter, norepinephrine. This means more of these neurotransmitters are released into the brain. This helps to reduce the positive feeling you get from smoking. This helps to reduce cravings and makes it easier to stop smoking.

Zyban also blocks receptors in your brain that are activated when you smoke (nicotinic acetylcholine receptors), which also helps to block the rewarding feeling of smoking.

How effective is it?

Clinical trials have shown that Zyban tablet is an effective treatment for quitting smoking, especially when combined with behavioural counselling.

Research has found that 1 in 5 smokers successfully quit and remain non-smoking after one year on Zyban. Similar success rates have been seen in patients with cardiovascular disease and COPD.

How long does it take Zyban to work?

You should start to feel the effects of Zyban within 2 weeks of taking it. You should experience fewer smoking cravings and, if you do smoke, it should start to feel less enjoyable. However, more significant, long-term effects will develop after 7-9 weeks.

Who can use Zyban?

Most adults aged 18 and over can use Zyban. However, if you have a specific medical condition or are taking certain medications, you should consult your doctor to determine if it's safe for you to use.

You should not take Zyban tablets if you:

  • are going through alcohol withdrawal
  • are going through benzodiazepine withdrawal
  • have bipolar disorder
  • have a tumour on your spine or brain (CNS tumour)
  • have an eating disorder
  • have a history of seizures
  • have severe liver disease

Consult your doctor if you are unsure whether any of these conditions apply to you. Our doctors review every consultation to make sure it’s suitable for you.

How do I take Zyban?

Zyban is available as 150 mg prolonged-release tablets. The starting dose is one 150 mg tablet once a day, but you will increase the dose after 1 week to one tablet twice daily.

You should choose a Target Stop Smoking day in week 2 of your treatment.

Zyban dosage schedule
Week 1 Days 1 -6
  • Take one tablet once a day
Day 7
  • Increase the dose to one tablet twice daily.
Week 2
  • Continue taking one tablet twice daily.
  • Stop smoking this week on your Target Stop Smoking Day
Week 3 - Week 9
  • Continue taking one tablet twice daily.
  • Start to reduce the dose after 7-9 weeks if your doctor advises you to.

Allow 8 hours between each dose. Do not take Zyban too close to your bedtime. This will prevent any sleep disruption.

Are there any side effects?

Like all prescription medicines, the Zyban pill may cause side effects. The most common side effects should go away on their own once your body gets used to the medicine.

Common side effects (up to 1 in 10 people):

  • stomach pain
  • anxiety
  • reduced concentration
  • constipation
  • dizziness
  • dry mouth
  • fever
  • headache
  • excessive sweating (hyperhidrosis)
  • difficulty sleeping (insomnia)
  • tremor (shaking)
  • vomiting

Speak to your doctor as soon as possible if you experience any persistent or serious side effects. If you experience any rare side effects such as seizures or an allergic reaction, please seek emergency medical attention.

For a full list of side effects, please refer to the patient information leaflet (PIL) which comes in the box with your medicine.

Can I get Zyban without a prescription?

No, Zyban is not available without a prescription. Our doctors will only prescribe treatment if you meet the criteria in your online consultation.

A prescription from a trusted healthcare provider like 121doc ensures:

  • safety during treatment
  • effective results
  • monitoring of side effects

Are Zyban and Wellbutrin the same?

No, Zyban is a treatment for smoking cessation, while Wellbutrin is an antidepressant. They contain the same ingredient, Bupropion. However, they are licensed for different conditions.

Does Zyban cause weight gain?

Weight gain can be a common problem when you quit smoking. This is because nicotine suppresses your appetite. So, stopping smoking increases your appetite and can lead to weight gain.

However, clinical trials have shown that Zyban is very unlikely to cause weight gain.

Can you drink alcohol on Zyban?

Some people are more sensitive to the effects of alcohol while on Zyban. So, you should avoid drinking excessive amounts of alcohol on Zyban. If you drink a lot of alcohol, do not stop suddenly, as it may increase the risk of having a fit (seizure).

Can I use Zyban with nicotine replacement therapy?

Yes, you can take Zyban with nicotine replacement therapy methods such as gum, patches or lozenges. Some evidence suggests it can help to promote success in staying smoke-free after a year on Zyban. However, you should always ask your doctor to make sure it’s safe for you to take both together.

Medical review byDr. Caroline FontanaLast review 05 December 2025
Dr. Caroline Fontana

Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.

Zyban Overview

Type of medicine: Norepinephrine–dopamine reuptake inhibitor (NDRI)
Used for: Quitting smoking
Active ingredient: Bupropion
Works by: Boost dopamine production to reduce the pleasurable effect of smoking.
Effective within: 2 weeks
Available as: Prolonged-release tablets
Available dosages: 150 mg
Usage instructions: One tablet once daily for 6 days, then increase to one tablet twice daily.
Packaging: Cardboard carton containing foil blister packs of tablets
Manufacturer Glaxosmithkline
Generic available No

FAQs

What is included in the online consultation?
Will a doctor review my consultation?
What happens after I submit my order?
What services are included with my order?
Is the price all-inclusive?
What are my delivery options?
Is it safe to buy prescription medication online?
Is this service discreet?
What is included in the online consultation?

Our online consultations are in the format of short medical questionnaires. You will be asked general questions about your health and medical history, as well as specific medical questions relevant to the treatment you have chosen. We will also ask you for your payment and delivery details to complete the order.

Online consultations take no longer than 5 minutes to complete. All questions are necessary when issuing prescription medicines. It means that our doctors can make sure the treatment is safe and right for you.

Will a doctor review my consultation?

Yes, it is a legal requirement that all online consultations are reviewed by a registered doctor. This is to make sure the chosen treatment is safe and right for you to take. All personal information is stored securely and confidentially.

Please note, all orders are subject to doctor approval, and we cannot guarantee that your order will be approved.

What happens after I submit my order?

Your online consultation will be sent directly to our medical team, where it will be reviewed by on of our in-house doctors.

If a doctor approves you for treatment, they will issue a prescription. Your prescription will then be forwarded to our pharmacist, where you medication will be dispensed and dispatched for delivery.

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As soon as you place the order, one of our doctors will review your consultation. On working days, this usually takes around one hour.

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If the doctor has any additional questions, you will receive a phone call and an email. We understand you might be at work or busy. Our customer service representatives are always discreet and can call back at a more convenient time if necessary.

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Once our pharmacy receives your prescription, you will get a second email with your package tracking code.

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