CVS ACETAMINOPHEN (ACETAMINOPHEN) CAPSULE [CVS PHARMACY] with any other drug containing acetaminophen (prescription or nonprescription). If you are not sure whether a drug contains acetaminophen, ask a doctor or pharmacist. if you are allergic to acetaminophen or any of the inactive ingredients in this product pain gets worse or lasts more than 10 days fever gets worse or lasts more than 3 days new symptoms occur redness or swelling is present. These could be signs of a serious condition.