Mental Health Home > Side Effects of Varenicline
The most common side effects of varenicline seen in clinical trials include nausea, headache, and insomnia. Rare side effects include cataracts, migraines, and diarrhea. There are also some varenicline side effects that, while occurring infrequently, are potentially serious and should be reported to a healthcare provider immediately, including difficulty breathing, high blood pressure, and extreme nausea or vomiting.
- Extreme nausea or vomiting
- Difficulty breathing
- Suicidal behavior
- Psychotic, aggressive, or strange behavior
- Signs of a stroke, such as:
- Vision or speech changes
- Weakness or numbness in an arm or leg
- Severe headache
- Chest pain or heaviness, which may be signs of a heart attack
- High blood pressure (hypertension)
- Signs of an allergic reaction, including unexplained rash, hives, itching, and unexplained swelling.