Table 1 Patient search criteria

Documented diagnosis of hypertension (recorded on practice hypertension register)

Documented history of an adverse drug reaction to either medication

Currently receiving repeat prescriptions of bendroflumethiazide tablets or indapamide tablets

History of having been prescribed both thiazide-like diuretics at different times, indicating a potential clinical reason for not being able to take one or the other

Aged 18 and over

Other clinical or non-clinical indications for not switching medication (applied manually, see below)