A drug called salsalate is currently approved to treat joint pain. However, researchers have shown that the drug can lower blood sugars. Salsalate reduces inflammation in joints and other tissues, and this may have some bearing on blood sugar levels.
Back in 1876 a medical journal reported using salicylate (simple form of salsalate) to treat a patient with diabetes.
Source: Ivanhoe’s Medical Breakthroughs