Clarithromycin
"Took generic Biaxin (500mg 2x a day) / clarythromicin and it quickly made my illness go away but at the expense of crummy side effects. Never had medicine make me have such bad digestive effects (diarrhea) plus severe headaches and spells of dizzyness. After three days called the doctor and he immediately changed my medicine. I do not recommend this medicine at all."