Clindamycin
"This was the first prescription for a salivary gland infection - 150mg x3 a day. I wasn't given any information about it, which is alarming after having looked up the side effects. I have thalassemia and Irritable Bowel Syndrome, so this was definitely a bad choice for me. Had to stop taking it after 6 doses, as I nearly passed out at work. After being off of it for 4 days and taking so little of it, I'm still experiencing the side effects as if I were still taking it, even with probiotics. I would recommend taking it as a last resort, but not at all if you already have digestive issues or blood disorders."