Varenicline (Varenicline Tartrate) — Patient Guide (UK)

Varenicline tartrate is a medicine used to help people stop smoking. It works by targeting nicotine receptors in the brain, reducing both cravings and the rewarding effects of smoking. This page explains how varenicline works, how it’s usually taken, common safety considerations, and practical tips to improve your chances of success.

In the United Kingdom, varenicline is available through routine pharmacy channels and is used alongside behavioural support where available. Always read the package leaflet provided with your specific product.

Quick overview

• Medicine name: Varenicline (as varenicline tartrate)
• What it’s for: Smoking cessation (stopping smoking)
• How it works: Partial activation of nicotine receptors (reduces cravings, blocks nicotine reward)
• Typical duration: Commonly 12 weeks, with the option to continue to help prevent relapse
• Available form (typical): Oral tablets taken by mouth

Indications (what varenicline is used for)

Varenicline is indicated for smoking cessation in adults. It may be used as part of a quit attempt to:

• Reduce nicotine cravings
• Reduce withdrawal symptoms when stopping
• Reduce the pleasure/effect you may get if you smoke (by blocking nicotine receptors)
• Support stopping on a planned quit date and remain abstinent

Your prescriber or pharmacist may also advise on an individual plan—especially if you have tried quitting before or have certain medical conditions.

How varenicline works (mechanism of action)

Nicotine dependence involves changes in the brain’s nicotinic acetylcholine receptors, which are activated by nicotine from cigarettes and other products.

Varenicline is a partial agonist at the α4β2 nicotinic receptor:

• Partial agonist activity: provides mild receptor stimulation, which can reduce withdrawal and cravings.
• Antagonist activity (blocking nicotine effects): competes with nicotine for the same receptor, which can reduce the rewarding effects if you smoke while taking it.

Overall, varenicline helps you quit by addressing both sides of nicotine dependence: the discomfort of withdrawal and the reinforcing reward from smoking.

Pharmacokinetics (how the body handles it)

Pharmacokinetics describes what the body does to a medicine—absorption, distribution, metabolism, and excretion.

• Absorption: Varenicline is absorbed after oral dosing.
• Distribution: It distributes through the body; it can cross into the brain where nicotine receptors are present.
• Metabolism: Varenicline is not extensively metabolised and does not rely heavily on liver enzyme pathways.
• Elimination: It is mainly cleared by the kidneys through urine.
• Implication: If you have kidney problems, your dose may need adjustment.

If you have renal impairment or are unsure about your kidney function, discuss dose suitability with a healthcare professional.

Typical use and timing

Common treatment course

Many quit plans use a 12-week course:

• Weeks 1–12: Build up and maintain therapeutic dosing
• After Week 12 (for some people): A further period may be considered to help prevent relapse

Quit date guidance

The traditional approach is to set a quit date during the first week or as advised by your clinician. Some people may start varenicline and then stop smoking fully once the medicine is established.

• Plan your quit date: Choose a day you can prepare for (remove cigarettes, lighters, ashtrays).
• Be ready for withdrawal: Cravings can feel strongest early on; varenicline is intended to help.

Dosing (usual adult schedule)

Dosing can vary by country, product strength, and individual factors such as kidney function. Use the regimen given by your clinician or on the pack. Below is a typical adult titration schedule.

Missed dose: If you miss a dose, take it when you remember unless it is close to the time for your next dose. Do not take a double dose to make up for a missed tablet.

Kidney impairment: Because varenicline is eliminated mainly via the kidneys, your healthcare professional may prescribe a lower dose and/or a different schedule if you have reduced kidney function.

Food interactions and taking with meals

Varenicline can generally be taken with or without food.

• If you experience nausea, taking it after food may help some people.
• Staying hydrated and eating regular meals may also reduce stomach discomfort.

Avoid making major changes to your routine without checking with your pharmacist if you are also taking other medicines for nausea or stomach problems.

Alcohol and medicine interactions

Alcohol

Moderate alcohol intake is not specifically known to have a direct pharmacological interaction with varenicline. However, quitting smoking can change habits and mood, and both alcohol and smoking cravings may trigger each other for some people.

• If you drink alcohol, consider keeping to low/moderate amounts while you establish your quit plan.
• Be alert to increased effects like dizziness or sleepiness, especially if you also use other substances that affect the central nervous system.

Interactions with other medicines

Varenicline has a relatively straightforward metabolism profile, so it tends to have fewer interactions than some other smoking cessation options. Nonetheless, interactions can occur and your overall medication list matters.

• Medicines affecting the kidneys: because varenicline is cleared by the kidneys, medicines that influence kidney function may require review.
• Other nicotine-containing products: using nicotine replacement (e.g., patches, gum, lozenges) at the same time may alter the experience of cravings and side effects. If you want to combine treatments, ask a clinician/pharmacist for a safe plan.
• Antidepressants and mental health medicines: most can be used, but your symptoms should be monitored carefully. Seek advice if you have any change in mood or behaviour.

Always provide your pharmacist with your full list of medicines and supplements, including over-the-counter products.

Safety profile and side effects

Like all medicines, varenicline can cause side effects. Not everyone gets them, and many are mild and improve as your body adjusts.

Common side effects

• Nausea (one of the most common). Often improves over time.
• Sleep disturbance or changes in sleep (including insomnia or vivid dreams).
• Headache.
• Constipation or indigestion.
• Vomiting or stomach discomfort (less common).

Less common but important to watch

• Mood changes, agitation, or unusual behaviour (particularly if you have a history of mental health conditions).
• Serious allergic reaction (swelling of face/lips, rash/hives, difficulty breathing).
• Seizures have been reported rarely; risk factors should be discussed.

When to seek urgent help

Stop taking varenicline and get urgent medical help if you develop signs of a serious allergic reaction or severe symptoms such as breathing difficulty, severe rash, or other serious medical emergencies.

If you experience significant or distressing changes in mood, behaviour, or suicidal thoughts, contact urgent support immediately (NHS 111 or emergency services, depending on severity) and seek prompt medical advice.

Practical use tips to improve success

Medicines work best when combined with a plan. Consider the tips below to support your quit attempt.

• Set up your environment: remove cigarettes, lighters, and ashtrays; clean clothes and car interiors if needed.
• Plan for cravings: create a “craving script”—drink water, chew sugar-free gum, take a brief walk, or do breathing exercises.
• Be consistent with dosing: take tablets at regular times to maintain steadier levels.
• Manage nausea: try taking after food; small, bland snacks may help. If nausea persists, speak to a pharmacist.
• Sleep support: if dreams or insomnia occur, take the evening dose earlier when possible (while still following your schedule guidance).
• Avoid “slips becoming relapse”: if you smoke one cigarette, restart your quit plan—do not abandon treatment. Seek advice promptly.

Behavioural support (for example, counselling, quit-line services, or NHS stop smoking support) can meaningfully increase the chances of long-term success.

Alternative options for smoking cessation in the UK

If varenicline is not suitable or you prefer another approach, there are alternatives. The “best” option depends on your health, preferences, and prior experience.

• Nicotine replacement therapy (NRT): patches, gum, lozenges, inhalators, and sprays. Useful for managing withdrawal by supplying controlled nicotine.
• Bupropion: an antidepressant that can help some smokers quit; suitability depends on medical history.
• Behavioural support alone: can be very effective, especially if paired with structured plans and follow-up.
• Combination strategies: some people benefit from pairing medication with NRT under supervision.

Discuss options with your pharmacist or local NHS stop smoking service. They can help tailor an approach to your needs and reduce side effects.

Recent guidance and UK context

In the United Kingdom, smoking cessation support is widely promoted by public health agencies and the NHS. Guidance generally focuses on:

• Using evidence-based treatments (including medicines where appropriate)
• Combining medication with behavioural support
• Monitoring safety, particularly mental health symptoms and tolerability
• Preventing relapse with follow-up and continued support beyond the initial quit attempt

Treatment recommendations may evolve as new evidence emerges. Your pharmacist can advise what is currently recommended based on your situation and any updates from relevant UK health bodies.

Delivery and availability in the UK

Availability can vary by product brand, strength, and local pharmacy arrangements. Many UK pharmacies provide online ordering with delivery options depending on stock and delivery region.

• Check stock availability: some products may require longer lead times.
• Packaging: tablets should arrive in original, properly labelled packaging.
• Storage: store at room temperature, protect from moisture, and keep out of reach of children (follow pack instructions).

Always confirm delivery estimates at checkout and ensure you receive the correct product strength (varenicline tablets are commonly titrated across doses).

Safety considerations (who should get extra advice)

Before starting varenicline, seek tailored advice if you:

• Have kidney disease or reduced kidney function
• Have a history of fits/seizures
• Have a history of mental health conditions and are concerned about mood changes
• Are pregnant, planning pregnancy, or breastfeeding
• Have a severe allergy history to medications

If you are unsure whether any of the above applies to you, speak to a pharmacist before using varenicline.

FAQ

How long does it take for varenicline to start working?

Many people notice reduced cravings and withdrawal symptoms within the first days of treatment. The full benefit often develops during the dose-titration phase and after the quit attempt begins. Results vary from person to person.

Should I stop smoking immediately when I start varenicline?

For many people, a quit date is set early in treatment. Some plans encourage stopping on a specific day within the first week. Follow the quit strategy you’re given and aim for complete abstinence when possible.

What if I smoke while taking varenicline?

Varenicline may reduce the rewarding effect of nicotine, but smoking can still occur. If you smoke, do not assume the treatment has “failed”—restart your quit plan as soon as possible and speak to a healthcare professional about adjusting your approach.

Can I use nicotine patches or gum with varenicline?

Combining varenicline with NRT may be considered for some people, but it should be planned with a pharmacist or clinician to reduce the risk of side effects and ensure the approach is right for you.

Will varenicline help with cravings even if I feel “fine” at first?

Nicotine cravings can fluctuate. Varenicline’s mechanism targets receptors linked to both cravings and nicotine reward, so it can help even if early days feel manageable. Staying consistent with dosing supports long-term success.

What should I do if I get nausea?

Nausea is common, especially early on. Tips include taking tablets after food, eating small bland meals, and keeping hydrated. If nausea is severe or persistent, seek pharmacist advice—they may guide supportive steps or review your dosing schedule.

Does varenicline affect sleep or dreams?

Some people experience vivid dreams, insomnia, or sleep changes. If this happens, discuss with a pharmacist. Small timing adjustments may help in some cases, but follow guidance from your dosing plan.

Can I drink alcohol while on varenicline?

There is no universally required alcohol restriction specifically due to varenicline. However, cravings and mood can be affected by alcohol, and individual reactions vary. It’s wise to keep intake moderate and consider avoiding alcohol triggers during your quit period.

Is varenicline safe for everyone?

Varenicline may not be suitable for every person, especially those with certain kidney problems or a history of seizures or significant mental health conditions. Always check suitability with a healthcare professional.

What happens if I stop treatment early?

Stopping early can reduce the likelihood of staying quit, particularly if you stop during the period when cravings and withdrawal peak. If you are struggling with side effects, speak to a pharmacist rather than stopping abruptly.

Important: This information is intended as a patient-friendly guide. For advice tailored to you, speak to a pharmacist or another healthcare professional and read the patient information leaflet supplied with your medicine.