Medicines information - safety and regulation 

  • Overview

How is the safety of medicines regulated? 

Side effects: the Yellow Card Scheme

All medicines can cause side effects. Some may not yet be known, so that's why it's important for people to report to the Yellow Card Scheme.

Media last reviewed: 30/09/2013

Next review due: 30/09/2015

Reporting an adverse effect

The Yellow Card Scheme is a special reporting system for possible adverse effects of medicines. If the healthcare professional treating you thinks a medicine may have caused a potentially concerning effect, they will fill in a report and send it to the MHRA.

You can also use the Yellow Card Scheme yourself, or on behalf of a child or adult in your care, by:

  • calling 0808 100 3352 to report an adverse effect over the phone
  • asking your pharmacist for a Yellow Card form you can send in the post
  • logging onto the Yellow Card Scheme website to report an adverse effect online

All medicines licensed for use in the UK are strictly regulated to ensure they are as safe as possible.

The entire process of medicine development is controlled and monitoring continues after medicines become widely available.

In the UK, the Medicines and Healthcare products Regulatory Agency (MHRA) is the organisation that looks after the safety of prescribed medicines and other health devices and equipment. Its main job is to make sure that medicines and medical devices, from painkillers to pacemakers, work properly and are acceptably safe.

The MHRA works closely with the European regulator, the European Medicines Agency (EMA), which oversees the safety of medicines across Europe. In some cases, the EMA takes the lead in licensing medicines used in the UK.

Ensuring safety

No product is completely risk free, so the MHRA uses as much information as it can to ensure the benefits of medicines to patients justify any possible risks.

Both the MHRA and EMA routinely carry out inspections to check all parts of the medicine development process, from testing to manufacturing, are carried out in line with strict regulations.

The MHRA assesses the results of clinical trials to decide whether or not new medicines should be licensed for use. Clinical trials are research studies that carefully test the safety and effectiveness of medicines, using strict criteria.

No medicine or medical device can be used in the UK until the MHRA or EMA has given it a licence that sets out how it should be used and what health condition it should be used to treat. Read more about licensing medicines.

However, no medicine is completely risk free and medicines can affect different people in different ways. For example, depending on your age and sex and what other medicines you may be taking, a medicine might cause you to have a side effect that someone else who is taking the same medicine does not have.

Ultimately, you and your healthcare professional have to weigh up the pros and cons of each medicine when deciding on the most appropriate treatment.

Monitoring safety

The MHRA continues to monitor the safety of medicines once they are in wider use, by checking reports about any problems or defects and reviewing new scientific evidence on different medicines.

If any problems arise, the MHRA can take action to deal with it. This may mean alerting healthcare professionals about a potential issue with a medicine and withdrawing a medicine from the market if it becomes apparent that side effects outweigh the benefits.

For example, in July 2012, the EMA recommended some alterations to the licence for a medication called calcitonin, which increased calcium levels in the bones, so it was no longer used to treat osteoporosis. A review of the medicine found an increased risk of cancer after long-term use. Therefore, calcitonin is now only used for serious conditions, such as Paget’s disease, when the benefits outweigh the risks. 

You can help the MHRA monitor the safety of medicines by reporting any suspected side effects to the Yellow Card scheme. Reports can also be made on behalf of someone you're caring for.

The MHRA is the UK medicines watchdog. Its Yellow Card Scheme collects reports of side effects for all medicines (including complementary medicines) and vaccines. If a new side effect is found, the MHRA will review the way the medicine can be used and alert the public to the potential risks.




Page last reviewed: 24/10/2012

Next review due: 24/10/2014

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The 1 comments posted are personal views. Any information they give has not been checked and may not be accurate.

Beit Zaid said on 06 November 2013

The MHRA limits patients choices and takes away personal responsibility. They are over-zealous about protection of a few which means that many more patients can find medicines that have been safely used and relied upon for years are suddenly unavailable. This leads to higher prices due to scarcity and the need for UK patients to source medicines from abroad or waste time going to see their GP for a prescription for the same medicine.

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