<unk>  was the second of the broad-spectrum tetracycline group of antibiotics to be discovered.<unk>  works by interfering with the ability of bacteria to produce essential proteins. Without these proteins, the bacteria cannot grow, multiply and increase in numbers.<unk>  therefore stops the spread of the infection and the remaining bacteria are killed by the immune system or eventually die.<unk>  is a broad-spectrum antibiotic, active against a wide variety of bacteria. However, some strains of bacteria have developed resistance to this antibiotic, which has reduced its effectiveness for treating some types of infections.<unk>  is still used to treat infections caused by Chlamydia (e.g. the chest infection psittacosis, the eye infection trachoma, and the genital infection urethritis) and infections caused by Mycoplasma organisms (e.g. pneumonia).<unk>  is also used to treat acne, due to its activity against the bacteria on the skin that cause acne (Propionibacterium acnes). It is used to treat flare-ups of chronic bronchitis, due to its activity against the bacteria usually responsible, Haemophilus influenzae.<unk>  may also be used to treat other rarer infections, such as those caused by a group of micro-organisms called rickettsiae (e.g. Q fever). To make sure the bacteria causing an infection are susceptible to it, a tissue sample is usually taken, for example a swab from the infected area, or a urine or blood sample.
Oxytetracycline hydrochloride
Doxycycline hyclate
Doxycycline Hyclate
Tetracycline hydrochloride
Doxycycline monohydrate
Minocycline hydrochloride
Doxycycline calcium
Doxycycline 