About tetracycline
Tetracycline antibiotic
Used for
- Certain bacterial infections, including acne and chlamydia
- Some rickettsial infections and respiratory infections
- Not effective for viral infections
Usual adult dose
Usually 250–500 mg by mouth every 6 hours; dose and duration depend on infection.
Usual dose in children
Generally avoided in children under 8; for older children, dosing is weight-based and condition-specific.
Common side effects
- Nausea, diarrhea, or stomach discomfort
- Sun sensitivity
- Tooth discoloration and effects on bone growth in young children
- Esophageal irritation
Important warnings
- Take with plenty of water; avoid lying down immediately afterward.
- Milk, antacids, iron, calcium, and zinc can reduce absorption.
- Avoid unnecessary use; antibiotic resistance can develop.
- May worsen kidney problems or cause severe diarrhea.
Pregnancy
Usually avoided, especially after the first trimester, because it can affect developing teeth and bones.
Breastfeeding
Generally avoided or used only with professional guidance; prolonged use may affect an infant’s teeth and bones.
Interactions
- Antacids and supplements containing calcium, iron, magnesium, or zinc
- Warfarin and other anticoagulants
- Oral retinoids, such as isotretinoin
- Penicillin antibiotics
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 It may be incomplete or out of date.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.