Beta blockers are well established drugs in the treatment of cardiovascular disease, after first being introduced 20 years ago. Today, they are used to treat patients with a range of cardiovascular conditions – hypertension, myocardial infarction, angina, heart failure and abnormal heart rhythms (arrhythmias). There is good evidence for beneficial effects with beta blockers and their use is recommended in many guidelines, including the recent British Hypertension Society guidelines. Prescribing of beta blockers in patients with heart disease is further encouraged as a ‘quality marker’ in the new GMS contract.