The dextromethorphan (DM part of Mucinex DM) should not act as a stimulant. It is a cough suppressant. It affects the signals in the brain that trigger cough reflex.
(I think you might be mistaken with Mucinex D, which contains guaifenesin and pseudoephedrine. The pseudoephedrine may act as a stimulant.).
- Mucinex Information for Consumers
- Mucinex Information for Healthcare Professionals (includes dosage details)
- Side Effects of Mucinex (detailed)
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