The mouth sore drug is called Amlexanox, and it’s been on the market for more than 15 years.
University of Michigan researchers gave mice a high-fat diet, and the mice became obese.
Then they injected the animals with Amlexanox and the mice lost weight, even though they kept eating the same amount of calories.
The mice gained all the weight back when they were taken off the drug.
The researchers will begin human studies later this year.