Do this by taking the medication at evenly spaced intervals throughout the day and night. Continue to take this medication until the full prescribed amount is finished even if symptoms disappear after a few days. Stopping the medication too early may allow bacteria to continue to grow resulting in a relapse of the infection. This medication may cause stomach upset, diarrhea, nausea, headache and vomiting during the first few days as your body adjusts to the medication. If these symptoms persist or become severe, inform your doctor.
Doxycycline increases sensitivity to sunlight.
Notify your doctor if you develop breathing difficulties, skin rash, hives or sore throat while taking this medication. This medicine should not be used during pregnancy or when breast-feeding. Consult your doctor. Doxycycline may make you more prone to sunburn. Wear protective clothing and a sunscreen.