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DRUG INTERACTIONS: This drug is not recommended for use with "blood thinners" (e.g., heparin, warfarin). Ask your doctor or pharmacist for more details. Tell your doctor or pharmacist of all prescription and nonprescription drugs you may use, especially: beta-blockers (e.g., atenolol, metoprolol), calcium channel blockers (e.g., diltiazem, nifedipine, verapamil), psychiatric drugs (e.g., chlorpromazine, fluphenazine), tricyclic antidepressants (e.g., amitriptyline, imipramine, nortriptyline), digoxin, cyclosporine, other epidural medications (e.g., lidocaine). Also, report any drugs causing drowsiness, such as: medicine for sleep, sedatives, tranquilizers, anti-anxiety drugs (e.g. , diazepam), narcotic pain relievers (e.g., codeine, morphine), anti-seizure drugs (e.g., carbamazepine, phenobarbital), muscle relaxants, 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 severe dizziness, headache, slow heartbeat, trouble breathing, decreased body temperature, irritability, or vision problems (miosis).

NOTES: Laboratory and/or medical tests (e.g., vital signs) will be performed to monitor your response to therapy.

MISSED DOSE: If your dose is interrupted, contact your doctor or pharmacist immediately to establish new dosing.

STORAGE: Store at room temperature at about 77 degrees F (25 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.