Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling. This could occur even if you have taken acetaminophen in the past and had no reaction. In rare cases, acetaminophen may cause a severe skin reaction that can be fatal. Get emergency medical help if you have signs of an allergic reaction: hives difficult breathing swelling of your face, lips, tongue, or throat. Side Effects What are the side effects of Nyquil Severe Cold & Flu (Acetaminophen, Dextromethorphan, Doxylamine, And Phenylephrine)? Do not use this medicine without a doctor's advice if you are breast-feeding a baby. Antihistamines and decongestants may also slow breast milk production. Do not use this medicine without a doctor's advice if you are pregnant.Īcetaminophen, dextromethorphan, doxylamine, and phenylephrine may pass into breast milk and may harm a nursing baby. It is not known whether this medication will harm an unborn baby.
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