I have seen the two taking together but you put yourself at risk for Serotonin Syndrome if you take Mucinex DM. Symptoms to look for are agitation, sweating, increased heart rate, and increased body temperature. Citalopram is less likely to cause this effect compared to other medications in this class, but I would still advise that you contact your physician or pharmacist to find an alternative agent that does not have dextromethorphan (DM).
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