No, while both copyright DM and Robitussin-DM are prescribed as cough suppressants, they aren't exactly the same medications. Robitussin-DM contains just dextromethorphan and guaifenesin expectorant , https://gregoryjmrt064805.mybuzzblog.com/21993451/is-copyright-dm-identical-to-robitussin-dm-cough-formula