 [ Symptoms ] i have an ulcer on the side of my tongue it is very sore is there a otc medication i can apply> [ Disease ] assuming you are not allergic to any medications you probably could safely use any of the over the counter toothache gels on your tongue this will not cure the ulcer but should relieve the pain however before you begin self treating i would suggest you consider what caused this ulcer do you smoke if so you should get this ulcer checked out because it could be an oral cancer is the ulcer large and just appeared out of nowhere that also might warrant checking out just to make sure it is not some sort of infection in short do not dismiss this ulcer as a mere annoyance if it does not get better quickly the tongue usually heals itself very rapidly then i would suggest you have a health care provider take a peek at it hope this helps