Allergic reactions to drugs are taking a heavy toll in the UK. Almost 3,000 people have died that way in the past three years, say official figures.
More than 13,000 others in the same period had an 'adverse drug reaction,'but survived with hospital treatment.
The statistics, obtained by the Liberal Democrats, include damage caused by 'over the counter' drugs such as aspirin and ibuprofen, the BBC reports.
Experts said that medicines could not be blamed for all the reported cases.
The figures are drawn from 'yellow card' scheme, run by the Medicines and Healthcare products Regulatory Authority (MHRA) to gather reports of all adverse reactions from both clinicians and patients.
Last year, there were reports of 964 patients in the UK who died as a result of an adverse reaction, compared with more than 1,000 the previous year, and 861 in 2004.
However, there is evidence that the vast majority of adverse drug reactions are never reported to the MHRA.
A study published last year suggested that 6.5% of all patients admitted to hospital had experienced a reaction, and that in four out of five cases, the medicines they were taking were to blame.
This adds up to as much as 250,000 cases a year - and an annual cost of £466 million to the NHS.
The MHRA has urged patients to join doctors in reporting drug reactions to them.
While in some cases a deadly side-effect or allergy could not have been predicted, Chief Medical Officer Sir Liam Donaldson has conceded that some cases should have been avoided.