Antibiotic Drugs cure disease by killing or injuring bacteria. The first antibiotic was penicillin, discovered accidentally from a mold culture. Today, over 100 different antibiotics are available to cure minor, and life-threatening infections. treatments for painful strep throat or ear infections as a child, to burning urinary tract infections or itchy skin infections as an adult, antibiotics are one of the most highly utilized and important medication classes we have in medicine. Anti-infectives are a large class of drugs that cover a broad range of infections, including fungal, viral, bacterial, and even protozoal infections. antibiotic drugs list