Sulfamethoxazole / trimethoprim
"I%u2018m half way through the course of tablets for a UTI. Never again do I want to take this drug. Had migraines from hell every single day since starting the treatment. After a really bad migraine today, I got suspicious this antibiotic might be trigger. I don%u2018t know what to do. I don%u2018t want to take another day of it. Today I had to take 100 mg of sumatriptan to get rid of a migraine.  I had a UTI a few months ago and a different doctor gave me another antibiotic that didn%u2018t give me the headaches from hell.
But stopping antibiotics before you finish your course leads to antibiotics resistance. But since I had migraines 5 days in a row I%u2018m not going to take another tablet!"