Cardiovascular events in users of sildenafil: results from first phase of prescription event monitoring in England

Abstract
Prescription event monitoring has been described elsewhere.2 Patients were identified from NHS prescriptions in England. Simple questionnaires were posted to the prescribing general practitioners about five months after the first prescription. These forms requested reporting of events after the drug had been prescribed. An “event” was any new diagnosis, any reason for referral to a consultant or admission to hospital, unexpected deterioration (or improvement) in a concurrent illness, suspected drug reaction, clinically important alterations in laboratory measurements or other investigations, or any other complaint considered to be of sufficient importance to enter in the patient's notes.

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