how long can doxycycline stay in your system
With no more doxycycline, your body will eliminate almost all of the drug in 5.5 x half life = 5.5 days. Note. Some rounding liberties have been taken here but because maximum half life is 22 hours and not 24 hours, for all practical purposes 5 days after your last 100mg dose you have no doxycycline in your system.
For adults, the normal dose of oral doxycycline is 200 mg on the first day of treatment. Usually you take that as two 100-mg doses, 12 hours apart. After this initial dose, people usually take a maintenance dose of 100 mg daily for seven to 10 days.ike all antibiotics, doxycycline will not treat colds, the flu, or other infections caused by viruses or fungi. A 2014 study found that a low dose of 40 milligrams (mg) of slow-release doxycycline daily could be an effective and safe therapy for ocular rosacea, or rosacea that affects the eyes.