No, even though both copyright DM Syrup and Robitussin-DM are used as cough suppressants, they aren't exactly the same medications. Robitussin-DM contains just dextromethorphan and guaifenesin mucus https://susanmrfs774851.total-blog.com/is-copyright-dm-syrup-identical-to-robitussin-dm-67694344