Tetracyclines are a class of antibiotics that may be used to treat infections caused by susceptible microorganisms such as gram positive and gram negative bacteria, chlamydiae, mycoplasma, protozoans, or rickettsiae. They were discovered in the 1940s and the first tetracyclines were obtained or derived from Streptomyces bacteria.

Tetracyclines are systemic, broad-spectrum antibiotics that treat a variety of types of bacterial infections as well as chronic conditions related to the presence of bacteria, such as acne and rosacea. Tetracycline antibiotics date back to the 1940s and have been used to treat infections in both humans and animals.

Tetracyclines are a group of antibiotics used to treat many different bacterial infections. Tetracyclines include the following: Tetracyclines are usually taken by mouth and work by preventing bacteria from producing proteins they need to grow and multiply.