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Cats + Medications & Supplements

  • Clonazepam is given by mouth and is used off label to treat seizures and certain behavioral disorders. Common side effects include sleepiness, incoordination, drooling, excitement, or increased appetite. Do not use in pets that are allergic to it or other benzodiazepines or in pets with significant liver disease. If a negative reaction occurs, please call your veterinary office.

  • Clopidogrel is given by mouth in the form of a tablet or compounded liquid and is used off label to prevent abnormal blood clots in dogs, cats, and horses. Give as directed by your veterinarian. Common side effects include vomiting, diarrhea, or lack of appetite. Do not use in pets that are allergic to it or that have bleeding problems. If a negative reaction or bleeding occurs, please call your veterinary office.

  • Clorazepate is given by mouth and is used off label to treat epilepsy and various behavior disorders. Give as directed by your veterinarian. Common side effects include sleepiness and incoordination. Clorazepate should not be used in pets that are allergic to it or other benzodiazepines or in pets with significant liver disease. If a negative reaction occurs, please call your veterinary office.

  • Cloxacillin is given by mouth and is used off label to treat certain bacterial infections, most commonly staphylococcal infections. Common side effects include gastrointestinal upset such as vomiting and diarrhea. Do not use in pets that have an allergy to penicillins or cephalosporins.

  • Codeine is given by mouth or injection and is used off label to treat mild to moderate pain, cough, and occasionally diarrhea. Give as directed by your veterinarian. Common side effects include sleepiness and constipation. Do not use in pets that are allergic to it or other opioids, in pets with inflammatory bowel disease, or in pets that have ingested a toxic substance. If a negative reaction occurs, please call your veterinary office.

  • Coenzyme Q-10 is an over the counter supplement given by mouth and is used off label to treat heart, nerve, or inflammatory conditions in dogs and cats. Give as directed by your veterinarian. Side effects are uncommon and have not been documented. Use cautiously in pregnant or nursing pets. If a negative reaction occurs, please call your veterinary office.

  • Colloidal oatmeal topical (brand name DermAllay®, Epi-Soothe, others) is an anti-inflammatory, antipruritic (anti-itching), and emollient (softening, soothing) agent used in the treatment of surface skin disorders and skin reactions in cats and dogs. It is made from oat grains (Avena sativa). Colloidal oatmeal topical comes in spray, cream rinse, and shampoo forms.

  • Colostrum is given by mouth and is used over the counter to treat various immune-mediated and inflammatory conditions. Give as directed by your veterinarian. Side effects are uncommon and may include gastrointestinal upset in pets with a dairy allergy. There are no known contraindications. If a negative reaction occurs, please call your veterinary office.

  • Cyanocobalamin (vitamin B12 or cobalamin) is a vitamin supplement used to treat systemic deficiencies. It can be given through a subcutaneous injection or oral tablet. The injection may sting temporarily, but otherwise is very safe. If a negative reaction occurs, call your veterinary office.

  • Cyclophosphamide is given by mouth or injection and is used off label to treat various cancers such as lymphoma, leukemia, carcinoma, and sarcoma. Common side effects include hair loss and hair coat changes. Do not use in pets that are allergic to it or that cannot be sufficiently monitored during treatment, are pregnant or lactating, have urinary obstruction, infection, bone marrow dysfunction, or have had an episode of blood in the urine that is not associated with a bladder infection. If a negative reaction occurs, please call your veterinary office.