PRECAUTIONS: Tell your doctor your medical history, including: high blood pressure, heart or thyroid disease, diabetes, glaucoma (narrow angle), prostate conditions, allergies. This medication may make you dizzy or drowsy; use caution engaging in activities requiring alertness such as driving or using machinery. Limit alcoholic beverages. Caution is advised when using this medication in the elderly, since they may be more sensitive to medication side effects. This medication should not be used in newborns. This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. This medication may pass into breast milk. Breast-feeding while using this medication is not recommended. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Before using this medication, tell your doctor of all prescription and nonprescription products you may use, especially of: methyldopa, guanethidine. Avoid taking MAO inhibitors (e.g., furazolidone, isocarboxazid, linezolid, moclobemide, phenelzine, procarbazine, selegiline, tranylcypromine) within 2 weeks before or after treatment with this medication. Also report drugs that cause drowsiness such as: medicine for sleep (e.g., sedatives), tranquilizers, anti-anxiety drugs (e.g., diazepam), narcotic pain relievers (e.g., codeine), psychiatric medicines (phenothiazines such as chlorpromazine, tricyclics such as amitriptyline), anti-seizure drugs (e.g., carbamazepine), muscle relaxants, other antihistamines that cause drowsiness (e.g., diphenhydramine). Check the labels on all your medicines (e.g., cough-and- cold products) because they may contain drowsiness-causing ingredients. Ask your pharmacist about the safe use of those products. 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 nausea, vomiting, drowsiness, blurred vision, deep sleep, slowed breathing, irregular heartbeat, hot or cold skin, numbness or tingling in arms or legs, shaking, and seizures.

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.