Migraine symptoms may be caused by the temporary widening of blood vessels in the head. Sumatriptan is believed to reduce the widening of these blood vessels. This in turn helps to take away the headache and relieve other symptoms of a migraine attack, such as feeling or being sick (nausea or vomiting) and sensitivity to light and sound.
Sumatriptan works only when a migraine attack has started. It will not stop you from getting an attack.
You must not use sumatriptan to prevent a migraine attack.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Possible side effects include:
- Headache, decreased sensitivity of skin (hypaesthesia), decreased mental sharpness, tremor, insomnia
- Fast or irregular heart beat (palpitation)
- Flushing (redness of the face lasting a short time)
- Throat discomfort
- Feeling sick (nausea), dry mouth, vomiting, diarrhoea, indigestion (dyspepsia)
- Feeling of heaviness in parts of the body, neck pain, stiffness
If you experience these or any other side effects while taking this medicine seek advice from your doctor or pharmacist.
Rarely this medicine can cause heart attack. It is important to be aware of the symptoms, which may include:
- Heaviness, pressure, tightness or pain in the chest, throat or other parts of the body
- Feeling of unusual sensations, including numbness, tingling and warmth or cold
Do not take this medicine if you are allergic to any of the ingredients listed.
Please read the patient information leaflet before using this medicine.
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