If the first dose does not relieve the headache, use no more of this medication for the same attack. If however, another attack occurs later, a second injection may be used if 1 hour has elapsed since the first dose. If you must take a second dose, do so exactly as instructed by your doctor. The maximum single dose is 100mg. Maximum dose to be given in a 24 hour period is three 100mg doses.
Tablets are to be swallowed whole with a glass of water.
Do not chew or crush them. Sumatriptan should only be used in patients with a clear diagnosis of migraine or cluster headaches. It should not be used for patients with coronary artery disease risk factors. This medication should be used only when clearly needed if you are pregnant or trying to become pregnant. Discuss the risks and benefits with your doctor.