Robitussin is a bran of cold and cough medicines produced by Wyeth Consumer Healthcare. It was originally produced by AH Robins of Richmond, Virginia. AH Robins was purchased by American Home Products (AHP) in the late 1980s. AHP owns Wyeth-Ayerst. Robitussin products are available over the counter in many countries worldwide, including the United States, Thailand and Nicaragua. The cough suppressant used in Robitussin cough formulations is dextromethorphan. The expectorant used alongside dextromethorphan in some products is guaifenesin, though their products marked for "congestion" may contain only guaifenesin.