Sulfamethoxazole / trimethoprim
"I have been taking this medicine for a week and my pimples are significantly smaller, which is a plus because I've had severe acne for 3 years now. The only problem is that it gives me insomnia, sweats, headaches in the mornings, stomach sickness, and nausea. The side effects are brutal, and I'm considering finding another solution. This is the third acne medicine I've tried and has helped the most, but also affected me the most negatively."