A medication sold under its generic name; -- usually legal only after the patent has expired, or if no patent was issued for the substance. Generic drugs are usually less expensive than proprietary medications.
A drug that that is in effect a copy of an original proprietary version of a drug.... more on: Generic drug
Drugs which have outlived their protection patent and which may be manufactured by any company. An example of this would be phentermine which is a generic of brand name fastin.