Within 24 h following exposure to relatively intense sunshine, the typical initial skin symptom of a phototox- ic reaction to doxycycline is a sunburn-like sensation (burning, erythema) in sun-exposed areas like the nose, upper cheeks, lips, and dorsal aspects of the forearms, hands, and fingers, partially resembling Mar 15, 2017
Adults: The usual dose of oral doxycycline is 200 mg on the first day of treatment (administered 100 mg every 12 hours or 50 mg every 6 hours) followed by a maintenance dose of 100 mg/day. The maintenance dose may be administered as a single dose or as 50 mg every 12 hours.Aug 3, 2021
Doxycycline can cause severe indigestion and problems with your throat and oesophagus (gut) if the tablets are not swallowed properly. Remain upright for at least 30 minutes after taking doxycycline. Do not lie down for at least 30 minutes after taking doxycycline or do not take it just before bed.
If you’re taking doxycycline more than once a day, try to space your doses evenly throughout the day. If you take it twice a day, this could be first thing in the morning, and in the evening. For preventing malaria, you’ll take 100mg once a day, usually in the morning.