If any of the following serious side effects occur, stop giving triamcinolone and seek emergency veterinary medical attention: an allergic reaction (difficulty breathing; swelling of the lips, tongue or face; hives), increased blood pressure or sudden weight gain. Other less serious side effects may occur. Continue giving triamcinolone and talk to your veterinarian if your pet experiences insomnia, nausea, vomiting or stomach upset, fatigue, muscle weakness or joint pain, problems with diabetes control, or increased hunger or thirst. Other side effects that occur rarely, usually with high doses of triamcinolone include thinning of the skin, cataracts, glaucoma, and behavior changes. Other side effects may also occur. Talk to your veterinarian about any side effect that seems unusual or bothersome to your pet.