Hi docs, would Mucinex (guaifenesin) dm get you high?

No. Dextromethorphan is in the Codeine family, but unlike Codeine or hydrocodone (Vicodin) it isn't an active opioid and therefore available OTC without prescription and unregulated by DEA as a controlled substance (unclassed). Cough medicine with Codeine would require a prescription because of abuse potential.