About doxycycline
Tetracycline antibiotic
Used for
- Treats certain bacterial infections, including respiratory, skin, and sexually transmitted infections.
- Treats acne and some tick-borne infections.
- Prevents malaria in some travelers.
Usual adult dose
Often 100 mg once or twice daily, depending on infection; follow the prescribed course.
Usual dose in children
For children aged 8 years and older, dose depends on weight and infection; generally avoided under age 8.
Common side effects
- Nausea, vomiting, or diarrhea
- Sun sensitivity
- Heartburn or irritation of the food pipe
- Yeast infections
Important warnings
- Does not treat viral infections such as colds or flu.
- Take with plenty of water; remain upright for at least 30 minutes.
- Separate from antacids, iron, calcium, and magnesium supplements.
- Can cause lasting tooth discoloration and affect bone growth in young children.
Pregnancy
Generally avoided during pregnancy, especially after the first trimester, because it may affect fetal teeth and bones.
Breastfeeding
Usually avoided for prolonged or repeated courses; short courses may be considered with clinical guidance.
Interactions
- Antacids and supplements containing iron, calcium, magnesium, or zinc can reduce absorption.
- Warfarin effects may increase.
- Some seizure medicines can reduce doxycycline levels.
- Isotretinoin may increase the risk of raised pressure around the brain.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.