I'm not sure whether you're talking about how long it's effective or the expiration date. It's good for years so don't worry about the expiration date on the bottle too much. As far as symptom management the half life is about two and a half hours so you should get relief for a few hours. But don't use it too often. There are side effects.
- Sumatriptan Information for Consumers
- Sumatriptan Information for Healthcare Professionals (includes dosage details)
- Side Effects of Sumatriptan (detailed)
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