Over Dose
Seek emergency medical attention. Symptoms of a sumatriptan overdose might include tremor, redness, or a warm feeling in your arms and legs, irregular breathing, large pupils; an uncoordinated feeling; and chest pain.

Side Effects
If you experience any of the following serious side effects, stop taking sumatriptan and seek emergency medical attention: an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives); or severe or prolonged chest pain or an irregular heartbeat. Other, less serious side effects may be more likely to occur. Continue to take sumatriptan and talk to your doctor if you experience nausea; drowsiness or di

Precautions
? Do not take sumatriptan if the headache you are experiencing is not like other migraines that you have had.

Drug Interactions
? Do not take sumatriptan if you have taken a monoamine oxidase inhibitor (MAOI) such as isocarboxazid (Marplan), tranylcypromine (Parnate), or phenelzine (Nardil) within the last 14 days. The combination could cause seizures, nausea, vomiting, sweating, flushing, and di