Read the Patient Information Leaflet if available from your pharmacist before you start taking rizatriptan and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth as directed by your doctor, at the first sign of a migraine. It may be taken with or without food, but may work faster when it is taken on an empty stomach. The dosage is based on your medical condition, age, response to treatment, and other drugs you may be taking. Children's dosage is also based on weight. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

If there is no improvement in your symptoms, do not take more doses of this medication before talking to your doctor. If your symptoms are only partly relieved, or if your headache comes back, adults may take another dose at least 2 hours after the first dose. Children should not take more than one dose, or 5 milligrams in a 24-hour period. For adults, the US manufacturer recommends a maximum dose of 30 milligrams in a 24-hour period. The Canadian manufacturer recommends a maximum dose of 20 milligrams (for adults) in a 24-hour period.

If you have a higher risk for heart problems (see Precautions), your doctor may perform a heart exam before you start taking rizatriptan. He/she may also direct you to take your first dose of this medication in the office/clinic to monitor for serious side effects (such as chest pain). Talk to your doctor for details.

If you are using drugs for migraine attacks on 10 or more days each month, the drugs may actually make your headaches worse (medication overuse headache). Do not use medications more often or for longer than directed. Tell your doctor if you need to use this medication more often, or if the medication is not working as well, or if your headaches get worse.