PGDs are not intended to replace a health professional prescribing for an individual patient on a one-to-one basis.
Individual patient prescribing is more appropriate for patients requiring long-term management of their condition which may involve treating a range of conditions, monitoring the effects of a medicine and of the condition itself.
NICE MPG2 (2017) states in recommendation 1.1.14: Do not use PGDs for managing long-term conditions, such as hypertension or diabetes, or when uncertainty remains about the differential diagnosis.
However, there may be some situations in which using a PGD may be appropriate for the direct supply and/or administration of a medicine to a patient with a chronic illness (e.g. administration of salbutamol nebuliser solution to a patient with an acute exacerbation of asthma).