Medicine that is protected by a patent and available without a doctor's prescription WordNet 3.0 & Open English WordNet

A patent medicine is a non-prescription medicine or medicinal preparation that is typically protected and advertised by a trademark and trade name, and claimed to be effective against minor disorders and symptoms, as opposed to an prescription drug that could be obtained only through a pharmacist, usually with a doctor's prescription, and whose composition was openly disclosed. Wikipedia

A medical compound of questionable effectiveness Wikipedia Disambiguation

Product that is promoted and sold as a medical cure, which may not have any medical value Wikidata

Any medicine with a proprietary formula which can be bought without a prescription, irrespective of whether it is protected by a patent. Wiktionary

Any medicine with a proprietary formula. Wiktionary (translation)