Is it ok to take benzonatate with robitussin dm?

2 Cough supressants: You are intending to take Robitussin DM, a medicine that has a cough suppressant and expectorant, with benzonatate,tessalon, which is also a cough suppressant. Instead, take the robitussin DM because it has the expectorant with it as well. Studies show that the combination of benzonatate and guaifenesin is excellent as well but should not be stacked with dextromethorphan. Good luck.