 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  known as triptans. It affects a certain natural substance (serotonin) that causes narrowing of blood vessels in the brain. It may also relieve pain by affecting certain nerves in the brain.Frovatriptan does not prevent future migraines or lessen how often you get migraine attacks. How to use Frova Read the Patient Information Leaflet if available from your pharmacist before you start taking frovatriptan 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 and response to treatment. 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, the U.S. manufacturer recommends that you may take another dose after 2 hours, up to a maximum of 3 doses (7.5 milligrams) in a 24-hour period. The Canadian manufacturer recommends that you may take another dose after 4 hours, up to a maximum of </s>