Nausea, headache, vomiting, drowsiness, gas, constipation, trouble sleeping, unusual dreams, or changes in taste may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

In a small number of people, varenicline may cause mental/mood changes, even after stopping the medication. Quitting smoking itself may also cause similar mental/mood changes. Tell your doctor or pharmacist immediately if you have symptoms such as depression/suicidal thoughts, aggressive or other highly unusual behavior.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

• rash

• itching

• swelling

• severe dizziness

• trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

Serious side effects are more likely if you continue to smoke while using this product. Do not smoke while you are using this medication.

Stop using this medication and tell your doctor immediately if any of these unlikely but serious side effects occur:

• severe dizziness

• mental/mood changes (e.g., irritability, trouble sleeping, vivid dreams)

• numbness/tingling in hands/feet

• swelling hands/ankles/feet

Stop using this medication and seek immediate medical attention if any of these rare but very serious side effects occur:

• chest pain

• confusion

• severe headache

• fast/irregular/pounding heartbeat

• slurred speech

• weakness on one side of the body

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist

 

Stop using this medication and tell your doctor immediately if any of these unlikely but serious side effects occur:

• severe dizziness

• mental/mood changes (e.g., irritability, trouble sleeping, vivid dreams)

• numbness/tingling in hands/feet

• swelling hands/ankles/feet

Stop using this medication and seek immediate medical attention if any of these rare but very serious side effects occur:

• chest pain

• confusion

• severe headache

• fast/irregular/pounding heartbeat

• slurred speech

• weakness on one side of the body

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

• rash

• itching

• swelling

• trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

 

Stop using this medication and tell your doctor immediately if any of these unlikely but serious side effects occur:

• mental/mood changes (e.g., irritability, trouble sleeping, vivid dreams)

• numbness/tingling in hands/feet

• swelling hands/ankles/feet

Stop using this medication and seek immediate medical attention if any of these rare but very serious side effects occur:

• chest pain

• confusion

• severe headache

• fast/irregular/pounding heartbeat

• slurred speech

• weakness on one side of the body

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

• rash

• itching

• swelling

• severe dizziness

• trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.