There is no fastest way to reduce swelling in adults with mumps. Depending on the cause of the mumps, there is a difference in the medication used to treat the symptoms, but if the mumps are caused by a bacterial infection, antibiotics can be used. If the mumps is caused by bacterial infection, you can use antibiotics, such as cefuroxime tablets, cefixime capsules and so on these antibiotics. If the patient has mumps, antiviral medication should be used to reduce the swelling, such as ribavirin tablets, or the patient can use some Qingdai San, applied to the parotid area can also play a certain role in the treatment. The diet for mumps should be light, and should not be too hard or too stimulating. Please use the medication under the guidance of a professional doctor for your specific condition.