Analysis of information sources in references of the Wikipedia article "Dextromethorphan" in English language version.
By sales, dextromethorphan is the most widely used OTC antitussive drug in the United States, and approximately 85% to 90% of OTC cough medicines contain dextromethorphan
By sales, dextromethorphan is the most widely used OTC antitussive drug in the United States, and approximately 85% to 90% of OTC cough medicines contain dextromethorphan
By sales, dextromethorphan is the most widely used OTC antitussive drug in the United States, and approximately 85% to 90% of OTC cough medicines contain dextromethorphan
By sales, dextromethorphan is the most widely used OTC antitussive drug in the United States, and approximately 85% to 90% of OTC cough medicines contain dextromethorphan