A member asked:

Hi i took robitussin dm (guaifenesin and dextromethorphan) about 3 hours ago and it hasn't helped, is it to soon to take some nyquil?

A doctor has provided 1 answer
Dr. Sean Agazanof answered

Specializes in Pharmacology

Maybe : Just take a Benadryl (diphenhydramine) it'll knock you out. If you are coughing and miserable make an appointment with your doctor and get the codeine cough syrup and get 10 hours of sleep. It will help. Sleep works wonders and the codeine cough syrup is godsent for coughs keeping you up at night until you recover from your cold.

Answered 3/2/2016



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