Diltiazem preparations (>60mg) prescribed generically

Below are the database queries which are used to create this measure. These are run against a copy of the BSA prescribing data which we store in Google BigQuery. We're working on making our BigQuery tables publicly available at which point it will be possible to run and modify these queries yourself. But even where code and database queries are not directly useable by others we believe it is always preferable to make them public.

Description Total items of generic diltiazem modified-release preparations, as a proportion of total items of all dilitiazem modified-release items (>60mg)
Why it matters The BNF states: Different versions of modified-release preparations containing more than 60 mg diltiazem hydrochloride may not have the same clinical effect. To avoid confusion between these different formulations of diltiazem, prescribers should specify the brand to be dispensed. You can read more in our detailed paper on unsafe prescribing of diltiazem.
Tags Cardiovascular system, Standard, Generic prescribing, Safety
Implies cost savings No
Authored by richard.croker
Checked by andrew.brown
Last reviewed 2024-02-12
Next review due 2026-02-12
History View change history on GitHub →

Numerator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM(items) AS numerator
 FROM hscic.normalised_prescribing
 WHERE bnf_code IN ("0206020C0AAACAC", "0206020C0AAAEAE", "0206020C0AAASAS", "0206020C0AAATAT", "0206020C0AAAUAU", "0206020C0AAAVAV", "0206020C0AAAWAW", "0206020C0AAAXAX", "0206020C0AABABA")
 GROUP BY month, practice_id

Denominator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM(items) AS denominator
 FROM hscic.normalised_prescribing
 WHERE bnf_code IN ("0206020C0AAACAC", "0206020C0AAAEAE", "0206020C0AAASAS", "0206020C0AAATAT", "0206020C0AAAUAU", "0206020C0AAAVAV", "0206020C0AAAWAW", "0206020C0AAAXAX", "0206020C0AABABA", "0206020C0BBABAC", "0206020C0BBACAS", "0206020C0BBADAE", "0206020C0BBAEAX", "0206020C0BCACAC", "0206020C0BFAAAS", "0206020C0BFACAT", "0206020C0BFADAU", "0206020C0BFAEAV", "0206020C0BFAFAE", "0206020C0BFAGAU", "0206020C0BFAHAV", "0206020C0BFAIAW", "0206020C0BFAJAX", "0206020C0BHABAT", "0206020C0BHACAU", "0206020C0BHADAU", "0206020C0BHAEAV", "0206020C0BHAFAW", "0206020C0BIAAAU", "0206020C0BIABAV", "0206020C0BIACAW", "0206020C0BIADAE", "0206020C0BJAAAT", "0206020C0BJABAU", "0206020C0BJACAV", "0206020C0BJADAW", "0206020C0BJAEAE", "0206020C0BMAAAE", "0206020C0BMABAU", "0206020C0BMACAV", "0206020C0BMADAW", "0206020C0BNAAAU", "0206020C0BNABAV", "0206020C0BNACAW", "0206020C0BNADAE", "0206020C0BNAEBA", "0206020C0BPAAAT", "0206020C0BPABAU", "0206020C0BVAAAV", "0206020C0BVABAW", "0206020C0BVACAE", "0206020C0BYABAT", "0206020C0BYACAU", "0206020C0BZACAV")
 GROUP BY month, practice_id
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