Clindamycin
"I was given 300mg to take 3x a day for 7 days for an abscess. Dentist & pharmacist warned of nasty side effects. Enclosed papers with instructions and warnings were scary and only recommend taking with food, water and avoid laying for 10 minutes after taking. I looked online to see if taking probiotics would help prevent colitis. Found these rating and was even further scared. 

I noticed everyone who gave positive reviews mentioned probiotics, yogurts, and staying upright for at least 30 minutes. So that is what I did. No side effects what so ever. No heartburn, diarrhea (I actually became constipated), or belly pain. I took a Probiotic with 10 billion strains 1x a day and ate a 0% Activia yogurt at every dose. Pain gone by day 3."