1. U.S. Food and Drug Administration. Testimony of Janet Woodcock, Director of CDER. Modernizing FDA's Regulations of Over-the-Counter Drugs. https://www.fda.gov/news-events/congressional-testimony/modernizing-fdas-regulation-over-counter-drugs
2. U.S. Food and Drug Administration. Drug Application for Over-the-Counter (OTC) Drugs. https://www.fda.gov/drugs/types-applications/drug-applications-over-counter-otc-drugs
3. U.S. Food and Drug Administration. Office of Nonprescription Drugs. https://www.fda.gov/about-fda/center-drug-evaluation-and-research-cder/office-nonprescription-drugs
4. Consumer Health Care Product Association. Value of OTC medicines to the U.S. Healthcare System. https://overthecountervalue.org/wp-content/uploads/2019/04/CHPA_OTC_Value_WhitePaper.pdf
5. U.S. Food and Drug Administration. Over-the-Counter (OTC) Drug Monograph Process. https://www.fda.gov/drugs/current-good-manufacturing-practices-cgmp-drugs-reports-guidances-and-additional-information/over-counter-otc-drug-monograph-process