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  • Calcitriol is used off label and is given by mouth or injection to treat low blood calcium levels associated with low parathyroid hormone, as well as chronic kidney disease, certain cancers, and certain skin diseases. Side effects are uncommon if the dose is appropriate.

  • Calcium acetate is given off label and by mouth to treat elevated blood phosphorus levels, especially due to kidney disease. Side effects may include nausea or stomach upset. This medication should not be used in pets that are allergic to it or have high blood calcium levels. If a negative reaction occurs, please call your veterinary office.

  • Calcium oxalate bladder stones are composed of a mineral called calcium oxalate. Cats are more likely to develop oxalate stones when their urine contains high levels of calcium and oxalate. Additionally, a low urine pH promotes the formation of oxalate stones. Bladder stones can cause significant inflammation and irritation of the bladder wall. Signs may include frequent urination, straining to urinate, blood in the urine, and urinating outside of the litterbox. Male cats especially are at risk of a life-threatening urinary obstruction. Treatment options and prognosis are discussed.

  • Calcium supplements are given by mouth or injection and are used on and off label and over the counter to treat low blood calcium levers in many species. Give as directed by your veterinarian. Side effects are uncommon but may include constipation. Do not use in pets with high blood calcium. If a negative reaction occurs, please call your veterinary office.

  • Calendula is given directly on the skin or by mouth and is used off label and over the counter to treat skin inflammation or gastrointestinal ulcers. Give as directed by your veterinarian. Side effects are uncommon but may include skin or stomach irritation. Do not use in pets that are allergic to it or that are pregnant. If a negative reaction occurs, please call your veterinary office.

  • Cannabidiol, also known as CBD, is a naturally occurring cannabinoid (a compound found in the Cannabis plant), which is used as an analgesic (pain reliever) and anticonvulsant. It is used to treat osteoarthritic pain and to help control seizures in dogs and other species. Cannabidiol should only be given under direction of a veterinarian. It is used “off label” or “extra label” in animals.

  • Cats and dogs can become intoxicated by cannabis in various ways, most commonly by eating edibles (e.g., baked goods, candies, chocolate bars, and chips containing cannabis), or by ingesting cannabis directly (in any form). Pets can also be exposed to second-hand smoke. A small amount may affect one pet more than another, so there is no official safe level of exposure. Many of the signs of intoxication are neurological, including disorientation, dilated pupils, and hyperactivity. In severe cases, tremors, seizures, and coma can result. Regardless of the method of exposure, accurate and complete information from the owner is imperative to treat the patient successfully.

  • Capillaria is a small internal parasite, often less than half of a centimeter in length. They are closely related to intestinal worms, though they can live in a variety of locations within the body. Capillaria can affect both dogs and cats, although dogs are more frequently affected. Diagnosis can be difficult because the eggs of Capillaria are shed only on an intermittent basis. While the parasite is easily eliminated with a dewormer, your cat may require additional medications to decrease the inflammation associated with the infection.

  • Capromorelin is an appetite stimulant used to encourage appetite in dogs and help manage weight loss in cats with chronic kidney disease. It is a liquid solution given by mouth. Side effects include vomiting, diarrhea, increased drinking and urination, and intestinal sounds. This medication should not be used in pets allergic to it and be used with caution in those with liver and kidney disease. If a negative reaction occurs, call your veterinary office.

  • Captopril is given by mouth and is used off label to treat congestive heart failure and high blood pressure. Give as directed by your veterinarian. The most common side effects include vomiting, diarrhea, or lack of appetite. Do not use in pets that are allergic to it or other ACE inhibitors. If a negative reaction occurs, please call your veterinary office.