Doxycycline: Antibiotic To Treat Bacterial Infections - NHS

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Side effects of doxycycline

Like all medicines, doxycycline can cause side effects, although not everyone gets them.

Common side effects

Common side effects of doxycycline include:

  • headaches
  • feeling sick (nausea) and being sick (vomiting)
  • a rash

Doxycycline should not affect your ability to drive, ride a bike or use machinery.

Non-urgent advice: Speak to a pharmacist or doctor if:

  • you have any side effects that bother you or do not go away

They may be able to give you advice about how you can reduce the side effects. Keep taking your medicine unless you're advised to stop.

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Serious side effects

Doxycycline can sometimes cause serious side effects, although most of them are rare.

Possible serious side effects of doxycycline include:

  • an allergic reaction (anaphylaxis) – causing symptoms such as a swollen throat or tongue, a raised, itchy rash and difficulty breathing
  • your skin being more sensitive to the sun – causing symptoms such as a rash, itching and redness (this may be harder to see on brown or black skin)
  • inflammation in the bowel – causing symptoms such as a stomach ache and bloody diarrhoea
  • changes in your blood cells – causing symptoms such as tiredness, bruising easily or getting ill a lot

Urgent advice: Call NHS 111 if:

  • you're taking doxycycline and think you might be having serious side effects

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