SPL Set ID: 2a3b79e8-f14c-4b44-9d3e-3c92a82269bd

Doxycycline is a broad-spectrum antibiotic synthetically derived from oxytetracycline, and is available as doxycycline hyclate (doxycycline hydrochloride hemiethanolate hemihydrate) capsules and tablets for oral administration. The chemical designation of this light-yellow crystalline powder is alpha-6-deoxy-5-oxytetracycline. Doxycycline has a high degree of lipoid solubility and a low affinity for calcium binding. It is highly stable in normal human serum. Doxycycline will not degrade into an epianhydro form. Doxycycline hyclate has the following structural formula: (C 22 H 24 N 2 O 8 •HCl) 2 •C 2 H 6 O•H 2 O M.W. 1025.89 (C 22 H 24 N 2 O 8 •HCl) 2 •C 2 H 6 O•H 2 O M.W. 1025.89 Each capsule for oral administration contains 50 mg or 100 mg doxycycline hyclate, equivalent to 50 mg or 100 mg doxycycline (anhydrous). Inactive ingredients for capsules are: anhydrous lactose, croscarmellose sodium, D&C Red #28, FD&C Blue #1, gelatin, magnesium stearate, microcrystalline cellulose, and titanium dioxide. Each tablet for oral administration contains 100 mg doxycycline hyclate, equivalent to 100 mg doxycycline. Inactive ingredients for tablets are: anhydrous lactose, carnauba wax, croscarmellose sodium, D&C Yellow #10 aluminum lake, FD&C Red #40 aluminum lake, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polysorbate 80, and titanium dioxide. Chemical Structure