Doxycycline monohydrate 100 mg capsules are a tetracycline antibiotic used to treat a wide range of bacterial infections. They work by stopping bacterial protein synthesis.
Key points
- Common uses (varies by infection): respiratory infections, skin/soft tissue infections, acne, certain sexually transmitted infections (like chlamydia in combination with other medications), Lyme disease and other tick-borne illnesses, and malaria prophylaxis for travelers. Your doctor will specify if this is the right antibiotic for your condition.
- How to take
- Typical adult regimens (examples; your exact dose may differ): 100 mg every 12 hours. Some infections may use a 200 mg dose on the first day, then 100 mg every 12 hours.
- Take with a full glass of water. Do not lie down for 30–60 minutes after taking to reduce the risk of throat or esophageal irritation.
- Avoid taking with dairy products, calcium/iron/m magnesium-containing antacids, or supplements close to the time you take doxycycline, since minerals can reduce absorption. If you need a supplement, space it out by a few hours.
- Note: The exact dose and duration depend on the infection. Follow your prescription label or the instructions from your clinician.
- Important safety information
- Not for use in pregnancy, in breastfeeding mothers, or in children under 8 years old because it can affect bone growth and permanently stain teeth.
- May cause sensitivity to sunlight (photosensitivity). Use sun protection when outdoors.
- Can cause upset stomach, vomiting, diarrhea, or yeast infections of the mouth or vagina.
- If you develop severe allergic reaction (rash, swelling, trouble breathing), seek urgent medical care.
- Interactions and cautions
- Avoid or separate from antacids, calcium, iron, magnesium, and dairy products around dosing.
- May interact with certain medicines (e.g., anticoagulants, other antibiotics). Check with your clinician or pharmacist if you take other drugs.
- Storage
- Store at room temperature, away from moisture and heat. Keep in original container and out of reach of children.
If you have a specific infection, your current medications, pregnancy status, or kidney/hepatic conditions, I can give more tailored information on dosing, duration, and safety. What would you like to know next?