Actually there are five.

Simulated situations typically encountered in general practice using humour to address rationalising the confusing options. The five in the title refers to the five types of drugs available to reduce hypertension. The scenarios are a bedside consultation with student doctors; a pharmacology viva; a GP surgery in which the female patient empties her handbag to reveal a multiude of conflicting drugs, a female GP who struggles to understand a male patient and his many euphemisms for the side-effects (impotence) that he is experiencing on the drugs he has been prescribed; a male doctor (Rowan Atkinson) accuses his patient of lying about taking his medication as his blood pressure is very high (the doctor shouts and intimdiates the patient). Throughout, an earnest lecturer calmy runs through the five causes and the recommended drugs outlining their side-effects.