Taking Lisinopril ~ & have developed a mouth sore on my rt. upper, inner gum!  It hurts, and will not go away, have had it for 4 wks. now.  I have never been proned to mouth sores or cankers andthe few I have had in the past usually go away in 3-5 days with baking soda treatment.
Hello! Read your query. ACE inhibitors can be causative for mouth ulcers. The best thing to do is warm salt water gargling thrice daily. Apply a lidocaine based gel like GEMSTONE before food. Maintain a proper oral hygiene. If it persists more than 1 week or new ulcers develop, you must consult with your physician for a change in the prescription. Regards.