-dizziness, feeling light-headed,
fainting, fast or pounding heartbeat;
-fever, stiff muscles, confusion, sweating, fast or uneven heartbeats;
-tremor (uncontrolled shaking), restless muscle movements in your eyes, tongue, jaw, or neck;
-agitation, hostility, confusion;
-increased thirst or urination, weakness, extreme hunger; or
-penis erection that is painful or lasts 4 hours or longer.