No, not much...: Nyquil or other cold medicines don't do much to help get rid of pneumonia. Cold medicines can lessen one's cough and runny nose, but the pneumonia still has to heal up by itself... With the help of antibiotics if it is a bacterial or mycoplasmal type of pneumonia. Mycoplasma are germs that are treated with medications like zithromax (similar to erythromycin).
Answered 2/27/2018
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