Antibiotics are designed to heal the body and fight off infections that are pulling you down. Ironically, these strong medicines come with their share of side effects, including some that can leave you feeling dizzy, anxious, depressed, or even suicidal. While it may come as a surprise to many, anyone who has experienced anxiety and weakness while on a course of antibiotics will probably relate to this. So is it possible that antibiotics are making you more anxious or depressed?