We share with our colleagues the difficulties presented by the increasing volume of drugs available for our use in the care of patients. The introduction of new and effective preparations has added to our problems both in keeping up to date and, paradoxically, in their proper selection and use. There are yet further difficulties in general practice because of the nature of the diseases and situations encountered; uncer- tainties in the preciseness of di-a.gnosis, in the likely course and outcome of diseases and in the particular characteristics of the individual patient. We have attempted to...