Question: how long should you take doxycycline 100mg?
Answer: For oral dosage form (Doryx® delayed-release capsules, Doryx® delayed-release tablets): For anthrax after possible exposure: Delayed-release capsules: Adults and children weighing 45 kilograms (kg) or more—100 milligrams (mg) two times a day (taken every 12 hours) for 60 days.