What Is the Tetracycline Class of Antibiotics?

What it means

Tetracyclines are a family of antibiotics. Members include tetracycline, doxycycline and minocycline. They work by stopping bacteria from making the proteins they need to grow. They are used for a range of infections and for some skin conditions such as acne.

Labels say 'tetracycline class' when a warning applies to the whole family. Common class warnings include tooth discolouration in children whose teeth are still developing and in babies exposed in later pregnancy, increased sensitivity to sunlight, irritation of the food pipe if the tablet sticks, and rare raised pressure inside the skull. Minerals such as calcium, iron, magnesium and antacids can reduce absorption, so labels give timing advice.

Tetracyclines are different from penicillins and cephalosporins, which work on the bacterial cell wall. Being allergic to penicillin does not automatically mean you react to tetracyclines, though any allergy should be discussed.

Where you may see it

• The 'Warnings' section of doxycycline and minocycline labels
• Leaflets advising to take with a full glass of water and stay upright
• Pregnancy and children sections of antibiotic labels