Drowsiness, dizziness, loss of coordination, headache, nausea, blurred vision, change in sexual interest/ability, hair loss, constipation, heartburn, or change in appetite may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor immediately if any of these unlikely but serious side effects occur: memory loss, shaking, difficult/slurred speech, vision changes, mental/mood changes (e.g., depression, including rare thoughts of suicide), trouble breathing (especially during sleep), stomach/abdominal pain, yellowing of skin/eyes, dark urine, seizures, easy bruising/bleeding, signs of infection (e.g., fever, persistent sore throat), unusual weakness, low body temperature. A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.