Antiplatelets, low-dose aspirin - Side effects 

Side effects of aspirin 

Reporting side effects

The Yellow Card Scheme allows you to report suspected side effects from any type of medicine you are taking. It is run by a medicines safety watchdog called the Medicines and Healthcare products Regulatory Agency (MHRA). See the website of the Yellow Card Scheme  for more information.

Aspirin can cause side effects, although serious reactions are rare.

Common side effects include:

  • irritation of the stomach or bowel
  • indigestion
  • nausea (feeling sick)

However, less than 10% of people taking aspirin experience these side effects. If you experience side effects, try sticking to basic food and taking your aspirin after a meal. See your doctor if you are worried or continue to experience them.

Less common side effects

Less common side effects of aspirin include:

  • worsening of asthma caused by narrowing of airways
  • vomiting
  • inflammation (swelling) of the stomach
  • bleeding in the stomach
  • bruising

In rare cases, a possible side effect of taking low-dose aspirin is haemorrhagic stroke (bleeding in the brain).

See your doctor if you experience any of these side effects when taking aspirin.

Allergic reaction

In some cases aspirin can cause an allergic reaction, although this is more common in people who have asthma. Go to the nearest hospital's accident and emergency department (A&E) if you experience:

  • swelling of the lips, mouth or throat
  • breathing problems
  • a skin rash which appears quickly

Page last reviewed: 17/04/2012

Next review due: 17/04/2014


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The 2 comments posted are personal views. Any information they give has not been checked and may not be accurate.

Tomek71 said on 05 February 2014

Thank you for very valuable information.
Also I found very interesting article about aspirin overdose.
Please check here:

Kind regards,

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offfay said on 17 June 2013

would like to know why 75bp asprin does not
or is it not supposed to?

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The Yellow Card Scheme

The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication