Co cardiovascular system
Reduced blood pressure, bradycardia, tachycardia, a transient increase in blood pressure (observed soon after taking sumatriptan). Rarely - violations of the heart rate, transient ECG changes in the ischemic type, myocardial infarction, spasm of the coronary arteries. Sometimes Raynaud's syndrome develops.
From the gastrointestinal tract
Nausea, vomiting, ischemic colitis (the association of these side effects with sumatriptan is not established); dysphagia, a feeling of discomfort in the abdomen.
From the side of the central nervous system and sensory organs
Dizziness, rarely convulsive attacks (in a number of cases they were observed in patients with a history of seizures orconditions predisposing to the occurrence of seizures; in some patients predisposing factors were not identified). Sometimes after taking sumatriptan, there is diplopia, flickering of the "flies" before the eyes, nystagmus, scotoma, visual acuity reduction. Very rarely develops a partial transient loss of vision. However, it should be borne in mind that visual impairment may be associated with the very seizure of the migraine itself.
Hypersensitivity reactions
Varies from skin manifestations (rash, hives, itching, erythema) to rare cases of anaphylaxis.
From the laboratory indicators
Minor changes in the activity of "liver" transaminases.
Other
Myalgia, the "flushes" of blood to the face, dizziness, a sense of weakness, a feeling of fatigue, drowsiness is usually weak or moderate and is of a transient nature.