Sulfamethoxazole / trimethoprim
"So, I wanted to review this drug because I've been on five antibiotic treatments within the last month and a half for the craziest UTI I've ever experienced in my life. Landed in the ER for fevers and pain and worst was the mental confusion.... Anyways, during  this time I've been on IV antibiotics, Z pak as well as  Keflex, which gave me horrible anxiety and extreme photo sensitivity. When I tried levaquin, it sent me to the ER. Then finally bactrim DS was prescribed. After taking it the first night I did have some trouble sleeping but after two doses of the medication I did adjust. I have been taking probiotics with these meds. It's helped overall. Side effects I noted vivid dreams, fatigue, and constipation were the main three."