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Other antibiotics

Tetracycline

Also sold as: Achromycin

Prescription neededOther antibiotics
Comes as:CapsuleEye ointment

Usual adult dose

Usual adult dose: 250 to 500 mg every 6 hours on an empty stomach with a full glass of water. Do not take at the same time as milk, antacids or iron. Eye ointment: apply as your doctor directs.

Your doctor may give you a different dose. Children's doses depend on weight.

Side effects

Common

  • nausea
  • heartburn
  • diarrhoea
  • sunburn more easily

Serious — get help

Stop taking it and see a doctor straight away if you notice:

  • severe headache with blurred vision
  • pain when swallowing
  • yellow eyes or skin
  • severe allergic reaction
  • severe or bloody diarrhoea

Do not take it, or take care, if

  • Pregnancy
  • Breastfeeding
  • Children under 8 (stains teeth and affects bones)
  • Kidney disease
  • Severe liver disease

Interactions

Medicines that can react with this one.

Serious1 medicineDo not take these together unless your doctor says so.
  • Isotretinoin

    Together they can raise pressure inside the skull (severe headache, vision problems); do not combine.

Moderate3 medicinesTake together only with care. Ask your doctor or pharmacist.
  • Aluminium hydroxide + Magnesium hydroxide

    Antacids block absorption; leave 2 to 3 hours between them.

  • Calcium carbonate

    Calcium blocks absorption; leave 2 to 3 hours between them.

  • Ferrous sulfate

    Iron blocks absorption; leave 2 to 3 hours between them.

Pregnancy

  1. A
  2. B
  3. C
  4. D
  5. X

Category D

There is evidence of risk to the baby. Used only in serious situations when safer medicines do not work.

Generic alternatives

Similar medicines your doctor or pharmacist may offer instead.

  • Doxycycline
Check with my other medicines

Always follow your doctor or pharmacistThis page is general information, not a prescription. Do not start, stop or change a medicine on your own.