Key Takeaways: Using Varenicline Safely

Start with a low dose: 0.5 mg once daily for first 3 days, then 0.5 mg twice daily for next 4 days, then 1 mg twice daily.
Set a quit date: Ideally between day 8 and 14, or quit by end of week 12 if gradual reduction.
Swallow tablets whole with water; can be taken with or without food.
Do not use if allergic to varenicline or any ingredients; avoid in pregnancy/breastfeeding unless benefit outweighs risk.
Kidney problems? Dose adjustment needed for severe impairment; consult your doctor.

Varenicline is a prescription medicine that helps you quit smoking by reducing cravings and blocking the rewarding effects of nicotine. Proper use – including the correct titration and timing – is essential for the best chance of success.

Important Safety Information

Stop varenicline and seek immediate medical help if you experience: swelling of face, lips, tongue or throat (allergic reaction); severe skin rash or blistering; agitation, depressed mood, suicidal thoughts; chest pain or shortness of breath; seizures. Do not drive if you feel dizzy or sleepy.

How to Take: Step-by-Step Usage Guide

Follow these steps exactly as your doctor prescribes. The typical course lasts 12 weeks, with an optional additional 12 weeks to prevent relapse.

Choose your quit date: Most people set a date between day 8 and day 14 of treatment. Alternatively, you can reduce smoking gradually and aim to quit by the end of week 12.
Start the starter pack: The pack contains two blisters: 11 × 0.5 mg white tablets (for days 1–7) and 14 × 1 mg light blue tablets (from day 8 onward).
Days 1–3: Take one 0.5 mg tablet once daily (morning) with water.
Days 4–7: Take one 0.5 mg tablet twice daily – morning and evening, at about the same times.
Day 8 onwards: Take one 1 mg tablet twice daily (morning and evening). Continue for the rest of the 12 weeks.
If you've quit at week 12: Your doctor may prescribe an additional 12 weeks of 1 mg twice daily to help you stay smoke‑free.

🗒️ Tip: Write your quit date on the pack as a reminder. Tell friends and family you're quitting – support improves success.

Dosage Guide (Titration Schedule)

The dose is gradually increased to help your body adjust and reduce side effects like nausea.

Days	Dose	Tablet colour/strength
1–3	0.5 mg once daily	White (0.5 mg)
4–7	0.5 mg twice daily	White (0.5 mg)
8–end of treatment	1 mg twice daily	Light blue (1 mg)

Renal impairment: If you have severe kidney disease (eGFR <30 mL/min), your doctor may start with 0.5 mg once daily and increase to 0.5 mg twice daily if needed. Avoid varenicline if you have end‑stage kidney disease unless specialist supervision.

Who Should Use Varenicline

Varenicline is suitable for most adults (18 years and over) who are motivated to quit smoking. It is particularly helpful if:

You have tried nicotine replacement therapy (patches/gum) without success.
You smoke 10 or more cigarettes per day.
You have a history of failed quit attempts and need extra support.
You are willing to commit to a 12‑week treatment course.

Studies show varenicline more than doubles your chances of quitting compared to willpower alone.

Who Should Not Use Varenicline

Do not take varenicline if:

You are allergic to varenicline or any of the tablet ingredients (see PIL).
You are under 18 years (safety not established).
You are pregnant or breastfeeding – unless your doctor decides the benefit clearly outweighs the risk.
You have end‑stage kidney disease and are not on dialysis (dose cannot be safely adjusted).
You have a history of seizures? – caution required, discuss with doctor.

Also use with caution if you have a history of depression or suicidal thoughts, as varenicline may rarely worsen these conditions. Your doctor will assess your individual risk.

Taking with Food and Without Food

Varenicline can be taken either with or without food. Food does not affect how much medicine is absorbed. However, if you experience nausea (a common side effect), taking the tablet with a meal or a glass of milk may help settle your stomach.

Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet – it is film‑coated for a reason.

Special Conditions: Pregnancy, Breastfeeding & Renal Impairment

Pregnancy

Varenicline is not recommended during pregnancy. If you are pregnant or planning to become pregnant, discuss non‑pharmacological methods or nicotine replacement therapy (under medical advice) first. The risks of smoking to the unborn baby are well known, but the safety of varenicline in pregnancy has not been established.

Breastfeeding

It is not known whether varenicline passes into breast milk. Therefore, a decision should be made whether to discontinue breastfeeding or to discontinue varenicline, considering the importance of the medicine to the mother. Consult your doctor.

Renal impairment

As mentioned in the dosage guide, patients with severe kidney problems require dose adjustment. Mild to moderate impairment usually needs no change, but inform your doctor about any kidney issues before starting.

Elderly

No special dose adjustment is needed for older adults, provided kidney function is adequate.

Varenicline Usage FAQs

What should I do if I miss a dose?

If you miss a dose, take it as soon as you remember. If it is within 3‑4 hours of your next dose, skip the missed dose and continue normally. Do not take two doses at once.

Can I drink alcohol while taking varenicline?

Some people report increased intoxicating effects of alcohol. It is wise to limit alcohol until you know how varenicline affects you.

What if I smoke a cigarette while on varenicline?

Try not to be discouraged. Varenicline will make smoking less satisfying, so any slip‑ups may actually reinforce your motivation. Keep taking the tablets and stay focused on your quit date.

Can I use varenicline with other quit‑smoking aids?

Combining varenicline with nicotine replacement therapy (patches/gum) is not generally recommended, as it may increase side effects. Always consult your doctor before combining treatments.

How long do I need to take varenicline?

The standard course is 12 weeks. If you have successfully quit at that point, your doctor may recommend another 12 weeks to reduce the risk of relapse.

Ready to Quit Smoking with Varenicline?

If you're motivated to stop, varenicline can significantly improve your chances. A UK‑registered doctor can assess your suitability and provide a prescription.