You need a higher dose of dextromethorphan for effective cough suppression than the amount of dextromethorphan in dayquil. You should buy either mucinex DM maximal strength, taking one tablet or a cheaper product at Rite Aid - Cough DM Cough Syrup with 12 Hour Relief, taking 10 cc before sleep. These medications have 3 times stronger cough suprression effect compared with dayquil.
Answered 12/18/2022
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