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Medications

  • Famciclovir is given by mouth and is used off-label to control feline herpesvirus. Give as directed. Side effects may include vomiting, diarrhea, decreased appetite, and increased drinking and urination. Do not use it in pets that are allergic to it or penciclovir. If a negative reaction occurs, call your veterinary office.

  • Famotidine is an antacid given by mouth or into the vein, and is commonly used off label to treat gastrointestinal ulcers and acid reflux. Side effects are uncommon but may include a slow heart rate, stomach upset, or dry mouth and skin. Use cautiously in pets that are geriatric or have liver, kidney, or heart disease. If a negative reaction occurs, please call your veterinary office.

  • Fenbendazole (brand names PanacurĀ®, Safe-GuardĀ®) is a medication used to treat a variety of parasites in dogs. Its use in cats for the treatment of parasites is off label or extra label. Fenbendazole comes as oral granules or as a liquid suspension and is given by mouth. Liquid forms must be measured carefully. Give this medication as directed by your veterinarian. At regular doses, fenbendazole does not usually cause any side effects. Fenbendazole should not be used in puppies younger than 6 weeks of age or in sick animals. If you suspect an overdose or an adverse reaction to the medication, call your veterinary office immediately.

  • Ferrous sulfate is given by mouth and is used off label to treat iron-deficiency. Use as directed by your veterinarian. Common side effects include gastrointestinal upset such as discomfort, constipation, nausea, vomiting, and diarrhea. Do not use in pets that are allergic to it. If a negative reaction occurs, please call your veterinary office.

  • Finasteride is given by mouth and is used off-label to treat benign prostatic hypertrophy (enlarged prostate) in intact male dogs, and may also be used for adrenal problems in ferrets. Give as directed. Side effects are uncommon. Do not use it in sexually developing animals or in females, including pregnant or nursing females. If a negative reaction occurs, please call your veterinarian.

  • Fipronil is used topically to treat flea, tick, and chewing lice infestations. Side effects are uncommon, but may include skin irritation at the application site. Do not use this product on pets less than 8 weeks old, geriatric pets, or sick/weak pets. If a negative reaction occurs, please call your veterinary office.

  • Firocoxib is given by mouth and is used off label to treat pain and inflammation. Common side effects include mild decreased appetite or vomiting. Do not use in pets that are allergic to it or other NSAIDs, in dogs less than 12.5 lbs (5.7 kg), or in dogs younger than 7 months old. If a negative reaction occurs, please call your veterinary office.

  • Fish oil is an over-the-counter supplement, given by mouth, that is commonly used to treat a wide variety of inflammatory conditions. Give as directed by your veterinarian. Side effects are not common but may include vomiting, diarrhea, or a fishy odor. Do not use concurrently with anticoagulant medications. If a negative reaction occurs, please call your veterinary office.

  • Flaxseed oil is derived from flax plant seeds and contains high levels of alpha-linolenic acid (ALA), an omega-3 fatty acid, and is used to treat certain inflammatory conditions. Give as directed by your veterinarian. Side effects may include diarrhea, vomiting, delayed wound healing, or an oily coat and skin flakes. Serious side effects include persistent stomach upset, or pancreatitis. Flaxseed oil should not be used in pets that are allergic to it. If a negative reaction occurs, please call your veterinary office.

  • Fleas are the most common nuisance and parasite affecting cats, and an infestation can lead to serious health problems. Flea control requires a three-pronged approach; they need to be eliminated from 1) your cat, 2) any other cats and dogs that you have, 3) your home and yard. There are many flea control products available and your veterinarian can help you determine which are safest and most effective for your pets.