Search for a brand name drug's generic name online at FDA.gov, according to the U.S. Food and Drug Administration. Click the Drugs link at the top of the home page, and then click the Drug Approvals and Databases link under the Navigate the Drugs Section heading on the Drugs page.
Click the Approved Drug Products with Therapeutic Equivalence Evaluations (Orange Book) Search link on the Drug Approvals and Databases Web page, as noted on the website. Click the Search by Proprietary Name link, enter the drug's brand name, select the list to search, and then click Submit. The results page lists information such as the drug's proprietary name, available strengths, applicant, application number and active ingredient/generic equivalent name. Generic drug product information is updated daily.
Another way to search for generic drug names is to click the Drugs@FDA Search link on the Drug Approvals and Databases Web page, as indicated on the website. Enter at least the first three characters of the brand name drug, its active ingredient or the application number into the search field, and then click Submit. Alternatively, select the drug's first letter to search alphabetically, as noted on the website. The results page lists information such as the drug name, active ingredient/generic equivalent name, manufacturer and available strengths.