Minocin is a prescription tetracycline antibiotic, which treats a wide variety of bacterial infections. Minocin is primarily known or prescribed to patients that suffer from severe acne. Minocin, however, is known to also treat anthrax, brucella infections, and meningococcal infection among many more. The active ingredient it contains is Minocycline that works to treat these bacterial infections by halting microbial growth altogether. In the case of acne, it also cuts down on the swelling and itching patients may experience.