Publication of UK guidelines reduced variation in clozapine prescribing from 34-fold to 5-fold¶

Claim · All claims
Evidence · 1 study · review r2 · q2
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? After NICE guideline publication, variation in UK prescribing rates fell from 34-fold (Purcell & Lewis, 2000) to 16-fold (Hayhurst et al., 2002) and then to 5-fold across 75 NHS mental health trusts (Downs & Zinkler, 2007). → Secchi Agostina 2025

Evidence¶

Secchi Agostina 2025¶

Secchi Agostina, Whiskey Eromona, Nair Sajitha, Shergill Sukhi, Thomas Trudy. (2025). Competence and confidence of health care professionals in using clozapine: a qualitative systematic review and thematic synthesis. Acta Neuropsychiatrica. https://doi.org/10.1017/neu.2025.10024

q2 · i? · review · r2

Database studies reported within the review: a county-wide audit found 34-fold variation, reduced to 16-fold after 2002 guidelines, then to 5-fold across 75 NHS trusts. The review attributes this to "increased knowledge of and confidence in the guidelines".

"Later, a study involving 75 NHS mental health trusts in England registered a further reduction of variation in prescribing rates to 5-fold (Downs & Zinkler, 2007), showing that the increased knowledge of and confidence in the guidelines helped to standardise the use of clozapine and reduced the prescribing differences in the country."

Discussion¶

Related Claims¶

• Exposure to clozapine use is associated with higher prescribing rates and better knowledge — related
• Health care professionals show substantial knowledge gaps about clozapine side effects, especially myocarditis and seizures — related
• Misconceptions and overestimation of clozapine side effects contribute to underprescribing and prescribing variation — related