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Illustrated Articles

Medications & Supplements

  • Sotalol is given by mouth or injection and is used off label in dogs and cats to treat abnormal heart rhythms. The most common side effect is tiredness. Do not use in pets that are allergic to it or that have asthma, heart block, slow heart rate, uncontrolled congestive heart failure, or shock. If a negative reaction occurs, please call your veterinary office.

  • Soy protein is given by mouth and is used over the counter to treat many conditions such as urinary incontinence, certain cancers, inflammation, obesity, and diabetes. Side effects may include gastrointestinal signs, or allergic reactions. Do not use in pets that are allergic to it, or in pets that are pregnant or nursing. If a negative reaction occurs, please call your veterinary office.

  • Spinetoram topical (brand name Cheristin®) is an insecticide used to prevent and treat flea infestations in cats and kittens. Avoid use in dogs. It comes in a liquid drop form.

  • Spinosad (brand name Comfortis®) is an antiparasitic used to kill adult fleas and to prevent and treat flea infestations in dogs and cats. It may be used off label (extra label) to treat other parasites and in other animals. It comes in an oral tablet form.

  • Spironolactone is given by mouth and is used off label to treat congestive heart failure, fluid accumulation, and other cardiovascular problems. Common side effects include increased drinking and urinating, mild decreases in energy, mild electrolyte imbalances, or vomiting/diarrhea. Do not use in pets that are allergic to it, have elevated potassium levels, Addison’s disease, acute kidney failure, significant kidney disease, that are not urinating or that may be used for breeding. If a negative reaction occurs, please call your veterinary office.

  • Spironolactone + benazepril (brand name Cardalis®) is a combination aldosterone antagonist (spironolactone) and angiotensin-converting enzyme inhibitor or ACE inhibitor (benazepril) used to treat certain types of congestive heart failure in dogs. Use to treat other heart conditions or in other species is "off label" or "extra label". Spironolactone + benazepril comes in chewable meat-flavored tablet form.

  • Spironolactone + hydrochlorothiazide is a combination aldosterone antagonist (spironolactone) and thiazide diuretic (hydrochlorothiazide) used to remove excess fluid and salt from the body in cats and dogs. This medication can be used in combination with other drugs to lower blood pressure and for protective effects on the heart muscle. It has also been used in dogs with fluid-up in the abdomen due to liver failure.

  • St. John’s wort is given by mouth and is used over the counter to treat pain, depression, anxiety, and other conditions. Give as directed by your veterinarian. The most common side effects include gastrointestinal upset, sun sensitivity, skin reactions, allergic reactions, dry mouth, or restlessness. Do not use in pets that are allergic to it, pregnant, nursing, very young, or very old or debilitated. If a negative reaction occurs, please call your veterinary office.

  • Stanozolol is given by mouth and is used off label to treat poor appetite, anemia, tracheal collapse, and other conditions. Give as directed by your veterinarian. Side effects may include behavior changes, limb swelling, or prevention of heat cycles. Do not use in pets that are allergic to it, are pregnant, breeding, or nursing. Pregnant women should NOT handle this medication. If a negative reaction occurs, please call your veterinary office.

  • Sucralfate is given by mouth and is used off-label to treat ulcers and erosions in the mouth, esophagus, stomach, and upper small intestine. Give as directed. Side effects are uncommon but may include constipation. Do not use in pets that are allergic to this medication. If a negative reaction occurs, please call your veterinarian.