Selegiline is used in the treatment of Parkinson's disease.
Selegiline works by increasing the amount of dopamine, a chemical messenger essential for controlling movement in the brain.
Common side effects of Selegiline include joint pain, insomnia (difficulty sleeping), vomiting, dizziness, constipation, diarrhea, confusion, hallucinations, movement disorders, headache, vertigo, hypotension (low blood pressure), slow heart rate, muscle cramps, fatigue, breathlessness, rash, pharyngitis, sinus inflammation, mouth ulcers, and increased liver enzymes.