All medicines may cause side effects, but many people have no, or minor, side effects.
Check with your doctor if any of these most common side effects persist or become bothersome:
Constipation; decreased sexual ability; diarrhea; dizziness; drowsiness; dry mouth; gas; headache; increased sweating; loss of appetite; nausea; nervousness; sore throat; stomach upset; trouble sleeping; vomiting; weakness.
Seek medical attention right away if any of these severe side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bizarre behavior; black or bloody stools; chest pain; confusion; decreased concentration; decreased coordination; exaggerated reflexes; fainting; fast or irregular heartbeat; fever; hallucinations; memory loss; new or worsening agitation, anxiety, depression, panic attacks, aggressiveness, impulsiveness, irritability, hostility, exaggerated feeling of well-being, restlessness, or inability to sit still; painful menstrual periods; persistent, painful erection; red, swollen, blistered, or peeling skin; seizures; severe or persistent headache or trouble sleeping; stiff muscles; stomach pain; suicidal thoughts or attempts; tremor; unusual bruising or bleeding; unusual or severe mental or mood changes; unusual swelling; unusual weakness; vision changes.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider.