The best replacement for robitussin dm is mucinex dm.

The best alternatives to robitussin dm are rated as following:
★★★★★  mucinex dm
★★★  robitussin
★★  nyquil
★★  delsym
★★  mucinex
★  robitussin ac
★  promethazine dm

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No companions for robitussin dm have been suggested so far.
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