Prescribing of pregabalin (total mg)

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 Prescribing of pregabalin (total mg) per 1000 patients
Why it matters Pregabalin is increasingly used in neuropathic and other types of pain. There are concerns about the potential for abuse. This measure shows the total amount in milligrams of pregabalin prescribed.
Tags Standard, Pain, Safety
Implies cost savings No
Authored by richard.croker
Checked by andrew.brown
Last reviewed 12/06/2023
Next review due 12/06/2024
History View change history on GitHub →

Numerator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM((p.quantity * i.strnt_nmrtr_val * COALESCE(n.nmtr_unit_conversion,1)) / -- calculate the total unit of drug, and convert if neccesary to miligrams). Uses COALESCE to default to 1 if conversion not available 
 COALESCE(d.nmtr_unit_conversion * i.strnt_dnmtr_val,1)) AS numerator  --divides unit dose if multiple, and converts to mililitre if necessary. Uses COALESCE to default to 1 if conversion or denominator strength not available
 FROM hscic.normalised_prescribing p INNER JOIN dmd.vmp v --this joins data table to dm+d vmp table 
 ON CONCAT(SUBSTR(p.bnf_code,0,9),SUBSTR(p.bnf_code,-2)) = CONCAT(SUBSTR(v.bnf_code,0,9),SUBSTR(v.bnf_code,-2)) --joins both brand and generics to vmp table 
 INNER JOIN dmd.vpi i -- joins vmp to vpi table to get ingredient strengths 
 ON v.id = i.vmp 
 INNER JOIN measures.vw__measure_conversion n -- joins unit conversion view to numerator unit of measure 
 ON i.strnt_nmrtr_uom = n.cd 
 LEFT JOIN measures.vw__measure_conversion d -- joins unit conversion view to denominator unit of measure (LEFT join as not all products have a denominator UOM) 
 ON i.strnt_dnmtr_uom = d.cd
 WHERE p.bnf_code LIKE '0408010AE%' --Pregabalin  
 AND i.ing = 415160008 --Pregabalin
 GROUP BY month, practice_id

Denominator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM(total_list_size / 1000.0) AS denominator
 FROM hscic.practice_statistics
 GROUP BY month, practice_id
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