Doxycycline is a prescription medication used to treat certain bacterial infections and to prevent malaria infections. Doxycycline belongs to a group of drugs called tetracycline antibiotics, which prevent the growth and spread of certain bacteria by inhibiting protein production.

This medication comes in tablet, capsule, syrup, and oral suspension (liquid) forms, and is typically taken once or twice a day.  The tablets and capsules should be taken with a glass of water, with or without food. However, taking doxycycline with milk or food may decrease the amount of medication absorbed from your stomach. Do not crush or break the delayed-release capsules.

Common side effects of doxycycline include nausea, sunlight sensitivity, and rash.