YellowCard - Helping to make medicines safer MHRA
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Frequently Asked Questions

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Side effects of medicines­­­

  • Who monitors the safety of medicines in the United Kingdom?
  • Why do medicines have side effects?
  • Why might a medicine become available before all its side effects have been identified?
  • If all medicines have side effects does this mean that no medicine is safe?
  • How are medicines monitored in order to ensure that new side effects are detected?
  • Since starting my medicine, I have noticed a number of new symptoms that I think may be due to the medicine. What should I do?