Japan grapples with ADHD drug shortage as demand surges
Concerta, an ADHD medication from Janssen, has been in nationwide short supply in Japan since last fall, with clinics unable to prescribe it to new patients and restricting long‑time patients to about two weeks’ worth. Janssen previously said stock would be resolved in about two months, but shortages persist and full restoration is expected to take many more months. Concerta is one of only three ADHD drugs approved for adults in Japan, a concern as the adult ADHD population grows.