This article deals with the specific antibiotic called tetracycline. For the group of antibiotics known as tetracyclines see tetracycline antibiotics. Tetracycline (INN) (IPA: ) is a broad-spectrum antibiotic produced by the streptomyces bacterium indicated for use against many bacterial infections. It is commonly used to treat acne. It is sold under the brand names Sumycin, Terramycin, Tetracyn, and Panmycin among others. Actisite is a thread-like fiber form, used in dental applications. It is also used to produce several semi-synthetic derivatives which together are known as the tetracycline antibiotic group.