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Cats + Medications & Supplements

  • Sulfamethoxazole/trimethoprim is given by mouth in the form of a liquid suspension or is given by injection in the hospital, and it is commonly used to treat bacterial and parasitic infections, sometimes off label, in dogs, cats, small mammals, and other exotics. Common side effects include a decreased appetite, vomiting, and diarrhea, although more serious side effects are possible such as dry eye, or liver, blood, or urinary problems. Do not use in pets that have severe liver damage, blood cell problems, dehydration, or sulfa allergies. If a negative reaction occurs, please call your veterinary office.

  • Sulfasalazine is given by mouth and is used off label to treat inflammatory large bowel disease and vasculitis. Give as directed by your veterinarian. Side effects include dry eye, decreased appetite, vomiting, yellowing of the skin, eyes, or body fluids. Do not use in pets that are allergic to it or other sulfonamides or salicylates, or in Doberman Pinschers, Miniature Schnauzers, or Samoyeds, or in pets with dry eye/KCS, intestinal or urinary blockages, or severe dehydration. If a negative reaction occurs, please call your veterinary office.

  • Sulfur, precipitated, topical (brand name Sulfodene®, others), is a medication used in the treatment of seborrheic (dry or greasy dandruff) disorders in cats and dogs to dissolve skin flakes and scales. It can have antibacterial, antifungal, and antiparasitic effects. It may be specially compounded and/or combined into a formulation with other medications.

  • A supplement is a concentrated ingredient that is added to the diet for nutritional or therapeutic benefits. Your best source of professional nutritional advice is a licensed veterinarian who is knowledgeable about supplements.

  • Tacrolimus ophthalmic is applied to the eye and is used off label to treat KCS (dry eye) and other immune-mediated and inflammatory conditions of the eye. Give as directed. Side effects are not common but may include irritation, eyelid twitches, or hair loss around the eye. Do not use in pets that are allergic to it or have a viral or fungal infection in the eye. If a negative reaction occurs, please call your veterinary office.

  • Taurine is given by mouth in the form of a capsule, tablet, powder, or liquid and is used as an over the counter nutritional supplement to treat taurine deficiency, dilated cardiomyopathy, and prevent retinal degeneration. Give as directed by your veterinarian. Side effects are rare but may include vomiting. There are no known contraindications to using this supplement. If a negative reaction occurs, please call your veterinary office.

  • Terbinafine oral tablets or granules are commonly used off label to treat skin or systemic fungal infections in dogs and cats. Common side effects are primarily gastrointestinal, such as vomiting, inappetence, and diarrhea, and should be used with caution in patients with liver or kidney disease. If treating with this medication long-term, your veterinarian will perform periodic blood tests to check liver function and monitor for any changes or elevations.

  • Terbinafine cream or spray is occasionally used off label to treat skin fungal infections in dogs, or in a veterinary combination product to treat ear infections. It is ineffective for treating fungal skin infections in cats. When given as directed, side effects are rarely noted, but could include skin irritation.

  • Tetracycline is given by mouth and is used off label to treat bacterial infections and inflammatory skin conditions in many animal species. The most common side effects include nausea, vomiting, diarrhea, and lack of appetite. Do not use in pets that are allergic to it or other tetracycline antibiotics, or in pregnant animals, especially in the first half of pregnancy. If a negative reaction occurs, please call your veterinary office.

  • Theophylline is used off label to treat cough caused by bronchoconstriction. It is given by mouth in the form of a tablet or liquid, or in hospital as an injection. The most common side effects include stomach upset and excitement. It should be used with caution in pets with abnormal heart rhythms, seizures, stomach ulcers, hyperthyroidism, kidney, liver, or heart disease, severely high blood pressure, severely low blood oxygen levels, or in young, old, or pregnant or lactating pets. If a negative reaction occurs, please call your veterinary office.