What Are Effective Medications For Laryngopharyngeal Reflux Other Than PPIs, Including Mucosal Cytoprotectants?

Hi, What is the best medication for Laryngopharyngeal Reflux (LPR) except Proton Pump Inhibitors (PPIs) that are the most effective medicines for the treatment of LPR.? but what about mucosal cytoprotectants ? Can you please advise the Trade name ? - Does zinc l-carnosine Help me to treat Laryngopharyngeal Reflux (LPR) ? - What is the name of blood test to know if i have a DAO deficiency ? is it accurate test ?? Thank you. Kind Regards