Lidocaine viscous mouth rinse is used to relieve pain of inflammation or sores of the mouth or throat. It is also used to reduce gagging during x-rays of the mouth or dental x-rays. Lidocaine viscous (Xylocaine Viscous) is a drug mainly used to numb sore mucous membranes (such as in the throat) for surgical purposes or disease symptom relief. Learn about side effects, drug interactions, recommended dosages, and storage information. Lidocaine Viscous (Lidocaine Hydrochloride Oral Topical Solution USP) is indicated for the production of topical anesthesia of irritated or inflamed mucous membranes of the mouth and pharynx. It is also useful for reducing gagging during the taking of X-ray pictures and dental impressions. Lidocaine Viscous is a numbing (local anesthetic) liquid used to ease pain from irritated or inflamed tissue in the mouth and throat, and to reduce gagging during X-rays and dental impressions. Lidocaine viscous 2% (also known as viscous lidocaine) is commonly used to numb red, swollen, and painful sores in the mouth and throat. It's available by prescription only. The typical dose for adults is to swish and spit (or swallow) 15 mL of lidocaine viscous 2% every 3 hours, as needed. What Is Lidocaine Viscous and How Does It Work? Lidocaine Viscous is used to treat sores inside the mouth, during dental procedures to numb the gums, and to numb the mouth and throat before a surgery or medical procedure. It works by blocking nerve signals in your body. Lidocaine viscous is used to treat sores inside the mouth, during dental procedures to numb the gums, and to numb the mouth and throat before a surgery or medical procedure. Lidocaine viscous should not be used to treat teething pain in infants. Lidocaine Viscous package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Xylocaine (lidocaine HCl) 2% Viscous Solution is indicated for the production of topical anesthesia of irritated or inflamed mucous membranes of the mouth and pharynx. Overview: Lidocaine for mucous membranes (such as the mouth and throat) is commonly used to prevent and relieve pain or to numb part of your body before a procedure. The most common side.