Hi.. Thanks for writing to us.. I have gone through your query and can understand your concerns.. As per your complain many a times taking antibiotics and pain relievers can cause side effects of causing mouth ulcers and it is a commonly seen side effect of these medicines.. As you have stopped taking the medicine, now gradually the symptoms will resolve once the effect of medication will wean off from the body.. You should continue taking Vitamin B complex or Bplex forte and along with it start applying Trimacenolone acetonide gel or ointment over the ulcers.. Do warm saline gargles.. If there is pain you can gargle with Lignocaine mouthwash before meals.. Avoid spicy and hard foods.. Take Ibuprofen to reduce inflammation and pain.. Do cool water rinses and suck ice pops.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.