19 drugs lose patent protection in 2026. The biggest single group is Neurology & psychiatry, with 4 drugs. Losing protection does not mean a drug disappears: it means other manufacturers can apply to sell the same medicine, and the original maker usually loses most of the sales within a year or two.
This is the earliest date a generic could enter; it is not a guarantee one will. We calculate it as the later of the last patent the company listed with the FDA and the last regulatory exclusivity. Companies often reach settlement agreements with generic makers for a different date, and those agreements are not public in this data.
Nuedexta (dextromethorphan hydrobromide; quinidine)Otsuka America Pharmaceutical · 1 patent · August 13, 2026
Dates from the FDA Orange Book, the official record of which patents cover
which approved drug; updated monthly. Facts only, not investment advice. Verify against the
Orange Book and primary filings. pdufa.bio is not affiliated with the FDA.
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