For adults aged 18 to 65 years, the recommended dose is a single 50mg tablet.
If the patient responds to the first dose of sumatriptan but the symptoms recur, a second dose of 50mg may be taken, but no sooner than 2 hours after the first tablet was taken.
No more than 2 tablets (100mg) should be taken within 24 hours.
If there is no response from the first dose of Sumatriptan, a second dose should not be taken.