Calcitriol is a prescription medication commonly used in the treatment of conditions caused by high or low parathyroid levels. It works by maintaining blood calcium levels by promoting the absorption and use of calcium in the body. If your pet has been diagnosed with chronic kidney disease, parathyroid disorder, or an associated disease, your veterinarian may prescribe a medication such as calcitriol. Consult with your pet's veterinarian before administering this medication and follow their specific recommendations for use.