CONTACT YOUR DOCTOR IMMEDIATELY if you experience anxiety; blood in the urine; blurred vision; chest pain; confusion; decreased coordination; fainting; falling asleep during the daytime or normal daily activities (eg, conversations, eating); fast, slow, or irregular heartbeat; hallucinations; impotence; joint stiffness or pain; nightmares; numbness or tingling of the skin; severe or persistent headache or dizziness; shortness of breath; swelling of the arms or legs; uncontrolled muscle movements; or unusual skin growths or change in the appearance of a mole.