uk-dgm MCQ (SBA): Orthostatic Hypotension and Medication Review

A 76-year-old woman presents to the falls clinic after two falls in the past 3 months. She has hypertension, type 2 diabetes, and osteoarthritis. Her medications include Doxazosin 4 mg, Bendroflumethiazide 2.5 mg, Amlodipine 10 mg, Metformin 1 g BD, and Diazepam 5 mg at night (prescribed 6 months ago for insomnia). Lying-standing blood pressure: lying 148/82, standing 118/68 mmHg at 3 minutes. Which medication change is MOST likely to reduce her fall risk?