what are the long term side effects of imitrex?
['Abdominal or stomach pain.', 'anxiety.', 'changes in patterns and rhythms of speech.', 'chest pain or tightness.', 'fast, slow, irregular, pounding, or racing heartbeat or pulse.', 'muscle cramps and stiffness.', 'neck, throat, or jaw pain.', 'nightmares.']