Cheap meds get more fills when doctors see options

Researchers launched a cluster trial in an urban outpatient network throughout 2021. They randomly split doctors into two arms – one that used a real‑time prescription benefit tool and another that did not. The trial covered a large pool of outpatient prescriptions, with more than a million potential scripts, though only a small slice met the study criteria.

The researchers examined every prescription that could be replaced by a lower‑cost, therapeutically equivalent medication. The tool popped up those alternatives right at the prescribing moment. They tracked whether each prescription was actually filled. For cheaper medicines the fill rates stayed about the same in both groups, showing the tool mattered most when cost was a hurdle.

Drugs that usually cost more than $120 for a month showed the biggest change. In the control arm only about a third of those prescriptions were filled, while the tool group saw nearly half get filled – an increase of roughly 15 points. The adjusted analysis showed a 14.5‑point difference for high‑cost drugs, with a confidence interval that did not cross zero.

Patients living in the lowest‑income areas experienced the sharpest rise, jumping from roughly 30% to over 70% of prescriptions being filled. This suggests the tool can meaningfully improve access when price is a barrier. Because many patients skip meds when they can’t afford them, this simple digital aid could save money and improve health outcomes.