Triamcinolone (Kenalog) is an inexpensive drug used to reduce swelling and ulcers in the mouth. It helps treat and relieve mouth sores that are not caused by herpes. this drug is slightly more popular than comparable drugs. It is available in brand and generic forms. It is not covered by most Medicare and insurance plans, but manufacturer and pharmacy coupons can help offset the cost. With the Patient Assistance Program from HealthWell Foundation, contact the program to see how they can financially help you out.