fatigue, drowsiness, dry mouth, increased sweating (hyperhidrosis), trembling,
headache,
dizziness, sleep disturbances, insomnia, cardiac arrhythmia, hallucinations, blood pressure changes, nausea and/or vomiting, diarrhea, heightened anorgasmia in females, impotence and ejaculatory problems in males. In rare cases (around over 1% of cases), some allergic reactions, convulsions, mood swings, anxiety and confusion have been reported.