Tetracycline, sold under various brand names, is an antibiotic in the tetracyclines family of medications, used to treat a number of infections, including acne, cholera, brucellosis, plague, malaria, and syphilis. It is available in oral and topical formu + some more technical info. Technically, tetracycline is a bacteriostatic agent that binds reversibly to the 30S ribosomal subunit, blocking the attachment of aminoacyl-tRNA and thereby inhibiting protein synthesis. The molecule (base formula C22H24N2O8) shows pH dependent solubility and forms salts such as the hydrochloride for improved formulation. Pharmacokinetics are characterized by variable oral absorption that is reduced by divalent and trivalent cations through chelation, limited hepatic metabolism, and combined renal and biliary elimination; plasma protein binding is moderate. Typical dosage forms include oral tablets and capsules, topical creams and ointments, and parenteral formulations for research and compounding uses. Stability concerns include sensitivity to light, heat, and acidic or alkaline conditions, which can induce epimerization and dehydration; good manufacturing practice and appropriate packaging are required to limit degradation and ensure consistent potency. Clinically relevant cautions include avoidance in pregnancy and in children under eight years due to permanent tooth discoloration and effects on bone growth.
Parent: Tetracycline / Lymecycline / Chlortetracycline
Parent: Lymecycline / Tetracycline
Parent: Tetracycline
Parent: Tetracycline/ Oxytetracycline
Parent: Tetracycline/ Tetracycline Hydrochloride
Parent: Tetracycline / Oxytetracycline
Parent: Tetracycline / Lymecycline
Parent: Tetracycline / Chlortetracycline / Lymecycline
The impurity and related compound profile for tetracycline includes epimers such as 4-epitetracycline, dehydration products such as anhydrotetracycline and anhydro-epimers, oxidative and demethylated derivatives, and trace amounts of structurally related tetracycline analogs. Analytical control is normally performed by validated reversed-phase HPLC with photodiode array or mass spectrometric detection to quantify individual and total related substances. Typical specification practice for active pharmaceutical ingredient batches and finished products is to control individual known related compounds to low single digit percentage levels and total impurities to a low percent range, for example individual specified impurities often limited to about 0.5 to 1.5 percent and total impurities commonly limited to about 2.0 to 3.0 percent depending on the pharmacopeial monograph and regulatory filing; unidentified impurities are usually held to more stringent limits consistent with ICH guidelines. Acceptance criteria, degradation limits and assay requirements vary by region and monograph, so manufacturers reference USP, Ph. Eur. or other applicable standards when defining exact impurity limits.
Tetracycline is used to treat a broad range of bacterial infections including acne, respiratory tract infections, sexually transmitted infections, certain zoonoses such as brucellosis, enteric infections such as cholera, and it has been used as part of regimens for malaria and plague; specific indications depend on the formulation, susceptibility of the organism, and national guidelines.
No, tetracycline is not a macrolide; it belongs to the tetracycline class and acts by inhibiting the 30S ribosomal subunit, whereas macrolides act primarily on the 50S ribosomal subunit and have a different chemical structure and spectrum.
Commonly referenced tetracyclines include tetracycline itself, doxycycline, minocycline, and oxytetracycline; these four share the tetracyclic core but differ in substitution patterns that affect pharmacokinetics and clinical use.
Topical tetracycline formulations can reduce bacterial load in some superficial skin infections and are used in dermatology for certain wound-related conditions, but systemic use for significant wound infections depends on culture and susceptibility; wound management should follow clinical assessment and local antimicrobial stewardship recommendations.
