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Educational Articles

Medications & Supplements

  • Clarithromycin is given by mouth and used off label to treat certain bacterial infections in several animal species. Do not use in pets that are allergic to it or other macrolide antibiotics, in rabbits, gerbils, guinea pigs, hamsters, or horses more than four months old.

  • Clindamycin topical (brand names ClinzGard®, others) is an antimicrobial used to treat bacterial skin infections, acne, anal sac abscesses, and other wounds in cats and dogs. Clindamycin topical comes in variety of forms.

  • 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.

  • Clonidine is a medication that is used to treat behavioral disorders in dogs, particularly anxiety or phobia-related. Give as directed. Side effects are generally mild if present and include sedation, lethargy, agitation/excitation, aggression, and constipation. Monitoring blood pressure as well as heart rate and rhythm is recommended with chronic use. If you suspect an overdose or an adverse reaction to the medication, call your veterinary office immediately.

  • 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.

  • 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.

  • Crofelemer CA1, also known as Crofelemer (brand name Canlevia®-CA1), is an antidiarrheal drug used to treat diarrhea caused by chemotherapy in dogs. Crofelemer CA1 comes in delayed release tablet form.

  • 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.

  • Cyclosporine is given by mouth and is used to treat atopic dermatitis in dogs and cats. It has also been used off-label to treat other types of immune-mediated conditions. Give as directed. The most common side effects include stomach upset, such as vomiting, diarrhea, and decreased appetite. Do not use in pets with severe infections, a history of cancer, allergies to the medication, that are nursing or pregnant, or in pets younger than six months old. If a negative reaction occurs, contact your veterinarian.

  • Cytarabine is a chemotherapy medication commonly used off label to treat blood cancers and brain inflammation. It is an injectable solution usually given in the vein by a veterinary professional. Common side effects include gastrointestinal upset and low blood cell counts. This medication should not be used or used with caution in pets with liver or kidney disease, those that have an allergy to this medication, and pregnant/lactating pets. If a negative reaction occurs, call your veterinary office.