how long do you take doxycycline monohydrate?
For more severe infections, such as chronic infections of the urinary tract, the recommended dose is 100 mg every 12 hours. In some cases, people may need to take higher doses, 300 mg a day for 10 days. For inhalational anthrax, the usual adult prescription is 100 mg of doxycycline twice a day for 60 days.