Leucovorin Prescriptions Rise

Why Did Leucovorin Prescriptions for Children Increase?

An analysis reported by Medical Xpress found that leucovorin prescriptions for children increased 46% after the medicine was publicly promoted as an autism treatment in September 2025. The prescribing change is important because it shows how quickly public statements can influence clinical demand, even when the supporting evidence is preliminary.

The reported increase should not be interpreted as evidence of better language, behavior, or developmental outcomes. Prescription data can reveal how frequently a medicine is dispensed, but they cannot establish whether patients benefited, which children were treated, why clinicians prescribed it, or whether adverse effects occurred.

What Does Research Show About Leucovorin for Autism?

Leucovorin, also called folinic acid, is a reduced form of folate. Researchers have investigated it in autism partly because some children may have abnormalities involving folate transport or folate-receptor autoantibodies. These proposed biological mechanisms may apply only to particular subgroups and have not established folinic acid as a broadly effective treatment for autism.

A randomized, double-blind, placebo-controlled trial published by Richard Frye and colleagues in Molecular Psychiatry found improved verbal communication among children with autism and language impairment who received high-dose folinic acid. However, it was a relatively small study in a selected population. Its findings do not prove that leucovorin improves autism's core features in most children, and they require confirmation through larger, independently replicated trials with careful safety monitoring.

Is Leucovorin Safe for Children With Autism?

FDA labeling includes established uses such as rescue after high-dose methotrexate and treatment of toxicity caused by certain folate-antagonist medicines. Autism is not an FDA-approved indication. Clinicians may legally prescribe an approved drug off-label, but that decision should rely on an individualized assessment, transparent discussion of the evidence, and monitoring for benefit and harm.

Leucovorin can cause adverse effects and may interact with other medicines, including some antiseizure treatments. Families should provide the prescribing clinician with a complete medication and supplement list. Leucovorin should not replace evidence-based developmental, educational, behavioral, communication, or medical support, and parents should not start or stop it without consulting a qualified healthcare professional.