There is a Central NHS Computer System called the Summary Care Record (SCR). It is an electronic record which contains information about the medicines you take, allergies you suffer from and any bad reactions to medicines you have had.
Storing information in one place makes it easier for healthcare staff to treat you in an emergency, or when your GP practice is closed.
This information could make a difference to how a doctor decides to care for you, for example which medicines they choose to prescribe for you.
Only healthcare staff involved in your care can see your SCR.
Patients can chose to NOT be involved with this scheme and need to complete an opt out form confirming this: