You can check all know interactions of drugs yourself with the website http://www.drugs.com/drug_interactions.php. Simply type in the drugs you wish to find and select the correct drug from the dropdown menu. All known interactions will then appear.
---- Interactions searched:
* acetaminophen (Ingredient of Nyquil Cold Medicine) * dextromethorphan (Ingredient of Nyquil Cold Medicine) * doxycycline * doxylamine (Ingredient of Nyquil Cold Medicine) * pseudoephedrine (Ingredient of Nyquil Cold Medicine)
---- 0 Interactions found:
* No results found - however, this does not necessarily mean no interactions exist. ALWAYS consult with your doctor or pharmacist. ----
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