This page explains what to do if you think you may have an adverse reaction to medication
What to report
If you think a medicine or herbal remedy has caused an unwanted side effect (an adverse drug reaction), please report the problem on a Yellow Card.
The Medicines and Healthcare products Regulatory Agency (MHRA) is the medicines safety watchdog. The Yellow Card scheme has been used for over 40 years to collect information on suspected side effects from all types of medicines. These include prescription medicines, medicines you can buy without a prescription, and herbal and other complementary remedies.
The MHRA welcomes Yellow Card reports on any suspected side effect. It is especially useful to know about:
Sometimes it is difficult to tell whether a possible side effect is due to a medicine or something else. Even if you are not sure whether a medicine or combination of medicines has caused a side effect, but suspect it has, please
complete a Yellow Card.
If you are worried about a suspected side effect, contact a doctor or pharmacist, or call NHS Direct in England and Wales on 0845 46 47 or NHS24 in Scotland on 08454 24 24 24.
How to report a suspected side effect
You can report a suspected side effect:
Who can report?
You can send a Yellow Card report about a suspected side effect experienced by:
The MHRA also collects Yellow Card reports of suspected side effects from health professionals, GPs, pharmacists and nurses.
Safety of medicines
Medicines are designed to prevent or treat illnesses, or relieve symptoms. Any medicine can cause side effects. Side effects may not be discovered until many people have used the medicine over a period of time.
Occasionally, side effects can appear after a person has stopped taking a medicine. You can help to make medicines safer for everyone by filling in a Yellow Card about a suspected side effect.
Don’t forget, if you are worried about a suspected side effect, contact a doctor or pharmacist.
You can also get information from:
The MHRA advises that you consult your health professional about any suspected side effect or adverse reaction from a medicine that you are taking. The MHRA cannot provide medical advice in individual cases.
NB If you have any difficulties with this information please contact the Dystonia Society Helpline on 0845 458 6322 they may be able to help you.
Revised August 2009