PRECAUTIONS: Before using this drug, tell your doctor your medical history, including: allergies (especially drug allergies), heart problems, kidney problems, liver problems, intestinal problems, lung or breathing problems, enlarged prostate, low blood pressure, low thyroid function, serious head injury, brain disorders, history of drug or alcohol dependency. Alcohol may add to the side effects of this drug, causing drowsiness or dizziness. Ask your doctor or pharmacist about the use of alcohol. Use caution if performing tasks requiring alertness since this medication can cause dizziness and drowsiness. To avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. Fentanyl passes into breast milk and may have undesirable effects on a nursing infant. Therefore, do not breast-feed without first consulting your doctor. Caution is advised when this drug is used in the elderly because they may be more sensitive to the effects of the drug.

DRUG INTERACTIONS: Tell your doctor of all nonprescription and prescription medication you may use, especially of: other narcotic pain relievers, tranquilizers, sleeping pills, anti-anxiety drugs, antidepressants, MAO inhibitors (e.g., phenelzine, linezolid, furazolidone, selegiline), droperidol, psychiatric medication (e.g., chlorpromazine), blood pressure drugs (especially water pills), anti-seizure drugs, certain antihistamines (e.g., diphenhydramine), muscle relaxants, cimetidine. This drug may interfere with certain laboratory tests (amylase and lipase). Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include unusual drowsiness or dizziness, very slow or weak pulse, slow or shallow breathing, muscle rigidity, and loss of consciousness.

NOTES: Your condition and response to this medication will be closely monitored.

MISSED DOSE: This medication is only given as needed by a health care professional.

STORAGE: Store at room temperature between 59 and 86 degrees F (15-30 degrees C) away from light and moisture.

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.