Tetracycline: Uses, Dosage, Side Effects and What to Know

If you’ve seen a prescription for tetracycline and wonder what it actually does, you’re in the right place. Tetracycline is an older broad‑spectrum antibiotic that fights bacteria by stopping them from making proteins. Doctors often reach for it when they need a single pill to cover several possible infections.

How Tetracycline Works and Common Conditions Treated

Tetracycline targets gram‑positive and gram‑negative bugs, plus some atypical microbes like Mycoplasma and Chlamydia. Because of that range it’s used for acne, respiratory infections (like bronchitis), urinary tract infections, Lyme disease, and certain sexually transmitted infections. It also shows up in eye drops for bacterial conjunctivitis.

The drug gets into the bloodstream quickly after you swallow a tablet, so it can reach infection sites fast. However, its effectiveness drops if taken with dairy products or antacids because calcium and magnesium bind to the drug and keep it from being absorbed.

Dosage Guidelines, Safety Tips and Alternatives

Typical adult dosing is 250‑500 mg every 6–12 hours, depending on the infection severity. For acne, doctors may start with a lower dose for several weeks to limit irritation. Always follow your doctor’s exact schedule – skipping doses can let bacteria become resistant.

Side effects are usually mild but worth watching. The most common complaint is stomach upset; taking the pill with a full glass of water and staying upright for 30 minutes helps. Sun sensitivity is another issue – you might burn more easily, so wear sunscreen if you’re outdoors.

Pregnant women and kids under eight should avoid tetracycline because it can affect tooth development, causing permanent discoloration. If you fall into those groups or have liver/kidney problems, ask your doctor about alternatives like doxycycline, minocycline, or a different class entirely.

When you get your prescription, read the label carefully and store the pills in a cool, dry place. Don’t share them with anyone else; antibiotics work best only when used by the person they’re prescribed for.

Bottom line: tetracycline is a versatile antibiotic that can tackle many infections, but it comes with specific dosing rules and safety checks. Knowing how to take it right and spotting side effects early will keep you on track to feel better faster.