Answer
Mood, behaviour or thinking changes have been reported, although nicotine withdrawal can cause similar symptoms. Stop treatment and obtain prompt clinical assessment for serious changes or suicidal thoughts.
Sources for this answer
- Varenicline 1mg film coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.