Adderall Shortages in US Spread to Two More Drug Suppliers

Two more pharmaceutical companies are having difficulty supplying Adderall to US patients with attention-deficit/hyperactivity disorder as shortages plague the market.

Lannett Co. and Par Pharmaceuticals, part of Endo International Plc, are the latest companies with limited supply of some doses of generic extended-release Adderall, according to a website updated Monday by the University of Utah’s drug-information service, which tracks drug shortages.

Across the country, people with ADHD are having trouble filling prescriptions for the medicine, which is supposed to be taken daily. Going without the pills can make it difficult for people with ADHD to focus and complete ...