Chlortetracycline is a broad-spectrum antibiotic tetracycline with a 7-chloro substitution. It inhibits growth of both Gram-negative and Gram-positive bacteria by inhibiting protein synthesis.

Chlortetracycline is an analog of tetracycline , a broad spectrum antibiotic. In addition to its actions against microorganisms, chlortetracycline suppresses inflammation by inhibiting neutrophil action and other aspects of the innate immune response. 4-epi-Chlortetracycline is an epimer of chlortetracycline.

Chlortetracycline Hydrochloride is a tetracycline with broad-spectrum antibacterial and antiprotozoal activity. Chlortetracycline hydrochloride (Isphamycin) is bacteriostatic and inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, thereby preventing the addition of amino acids to the growing peptide chain. This tetracycline is active against a wide range of gram-positive and gram-negative organisms, spirochetes, rickettsial species, certain protozoa and Mycoplasma and Chlamydia organisms.

Isochlortetracycline is an inactive alkaline product of the degradation of the broad-spectrum antibiotic chlortetracycline.

4-Epianhydrochlortetracycline (hydrochloride) can be used in related research in the field of life sciences. Its product number is T35950 and CAS number is 158018-53-2.

Tetracycline hydrochloride (NCI-c55561) is the hydrochloride salt of the tetracycline, a broad-spectrum naphthacene antibiotic produced semisynthetically from chlortetracycline, an antibiotic isolated from the bacterium Streptomyces aureofaciens. In bacteria, tetracycline blocks binding of aminoacyl-tRNA to the mRNA-ribosome complex, thereby inhibiting protein synthesis and bacterial cell growth. Because naturally, fluorescing tetracycline binds to a newly formed bone at the bone/osteoid interface, tetracycline-labeling of bone and fluorescence microscopy may be used to perform bone histomorphometry.

Anhydrotetracycline (hydrochloride) is a potent competitive inhibitor of broad-spectrum tetracycline destructase enzymes.