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SIDE EFFECTS: Drowsiness, dizziness, lightheadedness, facial flushing, nausea, vomiting, or constipation may occur. If any of these effects persist or worsen, tell 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: mental/mood changes (e.g., confusion, hallucinations), fast/irregular heartbeat, slow/shallow breathing, trouble urinating.Seek immediate medical attention if this rare but very serious side effect occurs: seizure.A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: 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 side 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.

PRECAUTIONS: Before taking this medication, tell your doctor or pharmacist if you are allergic to any of its ingredients; or to narcotic pain relievers (e.g., morphine); or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: abdominal problems (e.g., chronic constipation, ileus, pancreatitis), adrenal gland problem (e.g., Addison's disease), brain disorders (e.g., seizures, head injury, tumor, increased intracranial pressure), breathing problems (e.g., asthma, emphysema), heart problems (e.g., irregular heartbeat), kidney disease, liver disease, mental/mood disorders (e.g., depression, psychosis), a certain spinal problem (kyphoscoliosis), underactive thyroid (hypothyroidism), trouble urinating (e.g., due to enlarged prostate or urethral stricture), use/abuse of drugs/alcohol.This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit the use of alcohol and certain other medications that cause drowsiness. (See also Drug Interactions.)To reduce dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.Liquid forms of this medication may contain sugar, alcohol, or aspartame. Caution is advised if you have diabetes, alcohol dependence, liver disease, phenylketonuria (PKU), or any other condition that requires you to monitor/avoid these substances in your diet. Consult your doctor or pharmacist about using this medication safely.The elderly may be more sensitive to the effects of this drug, especially dizziness and drowsiness.Caution is advised when using this drug in children because they may be more sensitive to the effects of this medicine, especially slow/shallow breathing and drowsiness.During pregnancy, this medication should be used only if clearly needed. It is not recommended for use in high doses or for long periods during the last 3 months of pregnancy due to increased risk for serious side effects in a newborn baby (e.g., withdrawal symptoms such as irritability, abnormal/persistent crying, diarrhea, seizures). Tell the doctor immediately if you notice any of these symptoms in your newborn. Discuss the risks and benefits with your doctor.This medication passes into breast milk and could have undesirable effects on a nursing infant. Therefore, breast-feeding is not recommended while using this drug. Consult your doctor before breast-feeding.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.