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A large Ontario study of nearly 2.3 million older adults identified 24 common "prescribing cascades" — where a drug's side effect is mistaken for a new condition, triggering another unnecessary prescription. Cardiovascular drugs were the most frequent culprits, and the iron-to-laxative pair topped the list for incidence. Experts say a simple pause before adding a new medication could prevent a lot of harm.
A new cohort study published in BMJ has identified 24 high-priority "potentially inappropriate prescribing cascades" (PIPCs) — situations where a drug's side effect is misread as a new medical condition, prompting yet another prescription that may do more harm than good. The study drew on prescription data from nearly 2.3 million community-dwelling Ontario adults aged 66 and older, making it one of the largest analyses of this phenomenon to date.
Cardiovascular drugs were the most common cascade starters, with antihypertensives involved in nearly 66% of cases. The research team, led by Dr. Paula Rochon of Sinai Health in Toronto, emphasizes that better documentation — noting when a drug was started and why — is key to spotting these patterns before they spiral. Experts also highlight that automated EHR alerts and greater pharmacist involvement could help catch cascades before they cause harm.
By the Numbers
Why it matters: Prescribing cascades add unnecessary medications, increase the risk of drug-related harm, and drive up healthcare costs — all largely preventable. A simple clinical "pause" when new symptoms emerge, combined with a thorough medication review, could go a long way in protecting older patients.
