Minocycline
"I was hesitant to take this because of the mixed reviews, but gave it a try for my horrible acne and within a day noticed it started working. I didn't have any side effects and my face started to purge (giant pimples forming) and my skin was getting worse, so I knew it was pushing everything out of my face to start clearing my skin. A week later I woke up extremely itchy on my neck, scalp, chest, back, shoulders, feet, hands, basically every where and I had broken out in hives. I took a Benadryl. Then at midnight it happened again but worse. My neck was swelling up and the hives were the color of a tomato and I was insanely itchy. If I didn't take a ton of Benadryl I would've had to go to the ER. Happened today again. No longer taking them."