There is no fastest way to treat runny nose in adults, it takes some time to recover, usually according to the cause, such as cold, sinusitis, allergic rhinitis, etc., which can be helped by medication, nasal wash and other methods of recovery. 1. Colds: If the runny nose is caused by colds, you can use cold and flu medications, such as aminocrystalline capsules, which can relieve the symptoms of colds and reduce the runny nose. 2. Sinusitis: Sinusitis symptoms are mainly runny nose, nasal congestion, etc., you can use Amoxicillin Clavulanate Potassium Tablets for treatment, which has a broad-spectrum anti-bacterial effect, and is conducive to the recovery of sinusitis. 3. Allergic rhinitis: if allergic rhinitis caused by running nose, you can use saline rinse nose, improve the internal environment of the nasal cavity, you can take anti-allergic drugs, such as levocetirizine hydrochloride tablets, and in severe cases, you can also use glucocorticosteroid nasal sprays, such as budesonide nasal spray. It is recommended to go to the hospital in time to improve the examination of running watery nose, to find out the cause of the medication and treatment under the guidance of the doctor.