available over the counter: no

uses: to treat hypertension, heart attack, and to prevent migraine headaches

mechanism of action: blocks nerve impulses; relaxes blood vessels in the brain

side effects
• common: dizziness, light headedness, decreased sexual ability, fatigue, weakness, drowsiness
• less common: anxiety, irritability, constipation, diarrhea, dry eyes, itching, nightmares
• serious: shortness of breath, wheezing, chest pain, swelling of ankles

concerns: do not discontinue drug suddenly; must be tapered; be cautious during exercise or hot weather to avoid fainting