What is the Yellow Card scheme?
The "yellow card" scheme, which allows medical professionals to report adverse reactions to drugs, has been in existence since 1964.
Reports are submitted to the CSM on a voluntary basis by doctors, dentists, pharmacists and coroners.
In the past 40 years, more than 400,000 reports of suspected reactions have been submitted.
Recently, the scheme has been extended to allow nurses, midwives and health visitors as well as radiographers and optometrists to report problems as well.
And there may be more changes on the way. The MHRA has accepted a recommendation in principle to allow members of the public to report adverse reactions to drugs.
Why was the yellow card system introduced?
The yellow card system was introduced after the thalidomide tragedy, which highlighted the need for keeping track of medicines which were already on the market.
It is seen as a vital way of gaining post-licensing feedback about drugs.
The thalidomide tragedy happened between 1959 and 1962, after thousands of women who had taken the drug to combat morning sickness during the early stages of pregnancy gave birth to deformed children.