Educational Articles

  • Cetirizine (brand name Zyrtec®, Reactine®) is an antihistamine used to treat pruritus (itching) associated with atopic dermatitis, urticaria (hives), and insect-bite reactions in cats and dogs. Its use is in cats and dogs is ‘off label’ or ‘extra label’. Cetirizine does not typically cause any side effects. Vomiting and increased salivation has been observed in some dogs. Certain drugs are known to interact with cetirizine including central nervous system depressants (e.g., diazepam, alprazolam) and digoxin.

  • Chlorambucil is given by mouth and is used off label to treat certain types of cancer and autoimmune diseases. Common side effects include fur loss and changes in hair coat, as well as gastrointestinal upset. Do not use in pets that are allergic to it or other alkylating medications, that have bone marrow disease, have an active infection, or that are pregnant or lactating. If a negative reaction occurs, please call your veterinary office.

  • Chloramphenicol (brand names Chloromycetin® and Viceton®) is a broad-spectrum antibiotic used to treat many different bacterial infections, including those caused by anaerobic bacteria and Rickettsia. Chloramphenicol comes in tablet form, capsules, as a liquid suspension, and also in an injectable form (chloramphenicol sodium succinate). Exposure in humans can have severe consequences that are irreversible, so care must be taken to avoid accidental exposure.

  • Chlorothiazide and hydrochlorothiazide are diuretics. They are used to help reduce the amount of water in the pet's body by increasing the flow of urine. These medications are also used to treat high blood pressure by decreasing the workload of the heart and arteries.

  • Chlorpheniramine maleate is an antihistamine. Antihistamines are used to relieve or prevent the symptoms of allergy. Your veterinarian may prescribe this medication to prevent itching in dogs and cats. It may also be beneficial for managing cats that excessively groom themselves.

  • Chlorpromazine is given by mouth or injection and is used off label as a sedative and to treat vomiting. Common side effects include tiredness, low blood pressure, low heart rate, or a tendency to react or startle to noises. Chlorpromazine should not be used in pets that are allergic to it or in pets with low blood pressure. If a negative reaction occurs, please call your veterinary office.

  • Cimetidine is a histamine-blocking agent. It helps reduce the amount of gastric acid secreted in the stomach. Cimetidine has been used for treating and preventing ulcers. It has also been used to treat gastritis and other reflux and hypersecretory conditions.

  • Ciprofloxacin ophthalmic (brand name Ciloxan®) an antibacterial agent used in the treatment of eye infections in dogs and cats. Its use in dogs and cats is off label or extra label. This medication should not be used in dogs that are allergic to quinolones. Some mediations may interact with ciprofloxacin, so it is important to tell your veterinarian about any medications that your pet is taking. If a negative reaction occurs, please call your veterinary office.

  • Ciprofloxacin is a systemic fluoroquinolone antibiotic used to treat bacterial infections. It is often given by mouth, but an injectable form is also available. The most common side effect is gastrointestinal distress, but other side effects are possible. It is contraindicated in young or dehydrated pets, or in pets with liver or kidney disease. It should not be the first-choice fluoroquinolone for veterinary patients.

  • Cisapride is used off label and is given by mouth to treat gastrointestinal motility disorders in cats, dogs, and small mammals. Common side effects include vomiting, diarrhea, and abdominal discomfort. Do not use in pets that are allergic to it or in pets with conditions that would be made worse by increased intestinal movement. If a negative reaction occurs, please call your veterinary office.