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Doxycycline, doxycycline monohydrate and doxycycline hyclate are yellow, crystalline powders with a bitter taste. The latter smells faintly of ethanol , a 1% aqueous solution has a pH of 2–3, and the specific rotation is [ α ] D 25 {\displaystyle [\alpha ]_{D}^{25}} −110° cm 3 /dm·g in 0.01 N methanolic hydrochloric acid .
Treatment with generic doxycycline 100 mg twice a day for 7 days has equal success with expensive delayed-release doxycycline 200 mg once a day for 7 days. [12] Erythromycin is less preferred as it may cause gastrointestinal side effects, which can lead to non-adherence.
Side-effects from tetracyclines are not common, but of particular note is phototoxicity. It increases the risk of sunburn under exposure to light from the sun or other sources. This may be of particular importance for those intending to take on vacations long-term doxycycline as a malaria prophylaxis.
Oxytetracycline is especially valuable in treating nonspecific urethritis, Lyme disease, brucellosis, cholera, typhus, tularaemia, and infections caused by Chlamydia, Mycoplasma, and Rickettsia. Doxycycline is now preferred to oxytetracycline for many of these indications because it has improved pharmacologic features. [clarification needed]
A hyclate (Latin: hyclas) is a pharmaceutical term for hydrochloride hemiethanolate hemihydrate [1] [2] (·HCl· 1 / 2 EtOH· 1 / 2 H 2 O), e.g. doxycycline hyclate. [ 3 ] [ 4 ] References
Common side effects include vomiting, diarrhea, rash, and loss of appetite. [3] Other side effects include poor tooth development if used by children less than eight years of age, kidney problems, and sunburning easily. [3] Use during pregnancy may harm the baby. [3] It works by inhibiting protein synthesis in bacteria. [3]