available over the counter: no

uses: to treat angina, hypertension, irregular heartbeat, tremors, migraine headache

mechanism of action: blocks nerve impulses

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