Doxycycline hydrochloride hemiethanolate hemihydrate.
Doxycycline hydrochloride 115 mg is approximately equivalent to 100 mg of doxycycline. Store in airtight containers. Protect from light. As for Tetracycline Hydrochloride. Gastrointestinal disturbances are reported to be less frequent than with tetracycline and doxycycline may also cause less tooth discoloration.