migraine
"I have been using Imitrex for over a year now. It works very well for me.  I had some trouble with chest pain for awhile. My Neurologist told me to try 1/4 to 1/2 tablet (25-50mg).  This has worked for me. The headache goes away and all side effects are diminished.  I found that the side effects varied depending on the manufacturer. There is something like a 7% variance in dosage (a 100 mg tablet can contain as little as 93 mg or as much as 107 mg of Sumatriptan). Also some coatings dissolve faster than others, therefore more severe side effects if the Sumatriptan is absorbed too rapidly."