About doxycyclin e
Tetracycline antibiotic
Used for
- Treats susceptible bacterial infections, including acne and chest infections
- Prevents malaria in some travelers
- Treats chlamydia and other sexually transmitted infections
Usual adult dose
Usually 100 mg once or twice daily, depending on infection; malaria prevention uses a different schedule.
Usual dose in children
For children aged 8 years and older, usually 2.2 mg/kg per dose twice daily, up to 100 mg per dose, for certain infections.
Common side effects
- Nausea, vomiting, or diarrhea
- Sun sensitivity and sunburn
- Throat or swallowing irritation
- Yeast infections
Important warnings
- Avoid in pregnancy and generally in children under 8 years; teeth and bone development may be affected.
- Take with plenty of water while sitting or standing; do not lie down immediately afterward.
- Can increase sensitivity to sunlight; use protective clothing and sunscreen.
- Finish the prescribed course; unnecessary use contributes to antibiotic resistance.
Pregnancy
Generally avoided, especially after the first trimester, because it may affect fetal teeth and bones.
Breastfeeding
Short courses are generally considered acceptable; prolonged or repeated use is usually avoided. Seek professional guidance.
Interactions
- Antacids and supplements containing iron, calcium, magnesium, or zinc can reduce absorption.
- Warfarin may have increased effects; monitoring may be needed.
- 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 It may be incomplete or out of date.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.