Mucinex Sinus-Max Pressure & Pain Caplets. This product contains Acetaminophen - pain reliever, Guaifenesin - expectorant and Phenylephrine HCl - nasal decongestant. This product gives temporary relief from nasal congestion, headache, minor aches and pains, sinus congestion and pressure and temporarily promotes nasal and/or sinus drainage. It also helps loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive.