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More common side effects may include:
Nausea, dizziness, drowsiness, trouble sleeping, constipation, unusual weakness, stomach upset and pain, headache or dry mouth may occur. If these effects persist or worsen, notify your doctor promptly. To relieve dry mouth, suck on (sugarless) hard candy or ice chips, chew (sugarless) gum, drink water or use saliva substitute. Report promptly: hallucinations, difficulty moving or walking, difficulty breathing. Unlikely but report promptly: confusion, restlessness, leg or foot swelling, fainting, twitching, chest pain, unusually fast or slow heartbeat. Very unlikely but report promptly: muscle pain, vision problems, fever, severe muscle stiffness, sudden irresistible urge to sleep. If you notice other effects not listed above, contact your doctor or pharmacist.