There are "major issues" over the way doctors document drug alleries that could be putting patients at serious risks, according to health experts.
The National Institute of Health and Care Excellence (Nice) said "insufficient information" about patients' allergies was being shared among healthcare workers.
Nice's guidelines say doctors should check if patients are allergic to any drugs.
Nice said prescriptions should be redesigned and standardised to record information on which drugs should be avoided to reduce the risk of drug allergy.
New guidelines also say doctors should check patients' allergy status before prescribing, dispensing or administering any drug.
More top news
Jamie Oliver turned down the offer of playing a hobbit in the movie adaptation of the book by JRR Tolkien, the TV chef has revealed.
Children are being put at risk as 11% of posts for permanent children's social workers remain unfilled, experts have warned.
A Network Rail boss who presided over the Christmas trains chaos will not receive a bonus of more than £300,000 when he leaves in February