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Is there any interaction between cough syrup (dextromethorphan hydrobromide + guaifenesin) and Concerta?

There are no known interactions between Concerta and dextromethorphan + guaifenesin syrup. If there are additional symptoms like nasal congestion or drainage, it may be helpful to use a saline nasal rinse to help clear out the nasal passages. Drinking plenty of fluids can also help with symptoms.