Blurred vision; dizziness; drowsiness; dry mouth; fatigue; headaches; incoordination; short-term memory loss; weakness.Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); anxiety; chest pain; difficulty breathing; difficulty sleeping; difficulty speaking; hallucinations; inability to control urination; increased muscle spasms; interrupted breathing; involuntary eye movement; sleep disturbances; stimulation; sudden rage; yellowing of the skin or eyes.Diarrhea; dizziness; flushing; fun; headache; heartburn; mild, temporary vision changes (eg, blurred vision, sensitivity to light, blue/green color tint to vision); stuffy nose; upset stomach.Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; fainting; fast or irregular heartbeat; memory loss; painful or prolonged erection; ringing in the ears; seizure; severe or persistent dizziness; severe or persistent vision changes; sudden decrease or loss of vision in one or both eyes; sudden hearing loss.