An audit of 654 patients aged 40-75 on statins for primary prevention of cardiovascular disease found that the majority had a 10-year CVD risk of less than 20%, suggesting overtreatment with statins. The audit recommends only prescribing statins for primary prevention if a patient's 10-year CVD risk is greater than 20%, as calculated by an established risk calculator, and to document the risk assessment and reasoning in the patient's notes.