Tetracycline are broad spectrum antibiotics derived from Streptomyces coelicolor bacteria. They are classified based on duration of action as short, intermediate, or long-acting. Tetracycline have an amphoteric structure and inhibit bacterial protein synthesis. Resistance can develop through enzymatic inactivation, efflux pumps, or ribosomal protection. Tetracycline are used to treat various bacterial infections and diseases. Side effects include upset stomach, diarrhea, and tooth discoloration. Interactions can occur with calcium, minerals, and other drugs. Tetracycline should be stored at room temperature away from heat, moisture, and light.