Doxycycline
"I have been on this medication for one month and my cystic acne is completely gone as a result, but it didn't clear up completely until week 3. I give this a 10 for the results. However, there is a long list of bad side effects for this medication and I suffered many of them. I had severe stomach pains. The pain wouldn't last long but it came on quick and strong before stopping. I also had some digestive issues, and an upset, gurgling stomach non-stop for the first week or two. I also got bad headaches and had no appetite for two weeks. It also made me nauseated at first. After week two, the side effects stopped, but it was a rough start."