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• Nystatin: Oral

  Nystatin is an antifungal, given by mouth in the form of a tablet or liquid suspension, and used off label to treat Candida fungal infections in dogs, cats, birds, and reptiles. Side effects are rare, but at high doses, it could cause stomach upset or mouth irritation. It should not be used in pets that are allergic to it.

• Oclacitinib

  Oclacitinib is given by mouth and is used to treat allergic dermatitis in dogs and has also been used off-label to treat other types of skin conditions. Give as directed. Side effects are uncommon but may include stomach upset such as vomiting, diarrhea, or decreased appetite. Do not use in pets with severe infections or in pets younger than 12 months old. If a negative reaction occurs, please call the veterinary office.

• Ocular Lubricants

  Ocular lubricants (brand names OptixCare® Eye Lube Plus, Remend® Eye Lubricating Drops, I-Drop® Vet Plus Lubricant/Gel) are tear replacement agents used to add moisture to the eyes in cats, dogs, and exotic companion animals. Ocular lubricants come in gel and liquid drop forms.

• Ofloxacin Ophthalmic

  Ofloxacin ophthalmic is an antimicrobial medication used to treat certain types of eye infections in cats, dogs, and exotic species. It may be used “off label” or “extra label” to treat other eye conditions. Ofloxacin ophthalmic comes in liquid drop form.

• Olive Leaf

  Olive leaf is given by mouth and is used over the counter and off label to treat a variety of conditions such as high blood pressure, high blood sugar, inflammation, and infections. Give as directed by your veterinarian. Side effects are uncommon but may include headache, muscle aches, or stomach upset. Olive leaf should not use in pets that are allergic to it, or in pregnant or nursing pets. If a negative reaction occurs, please call your veterinary office.

• Olopatadine Ophthalmic

  Olopatadine ophthalmic is an antihistamine medication used to treat pruritus (itchiness) of the eyes caused by allergies in animals. Olopatadine ophthalmic comes in liquid drop suspension form.

• Omeprazole

  Omeprazole is given by mouth and is used off-label to treat ulcers and erosions in the stomach and upper small intestine. Give as directed. Side effects are uncommon but may include stomach upset, such as vomiting, diarrhea, or gas. Do not use in pets with a history of allergies to this class of drugs. If a negative reaction occurs, call your veterinarian.

• Ondansetron

  Ondansetron (brand names Zofran®, Zuplenz®) is given by mouth or injection and is used off label in dogs and cats to treat vomiting. Side effects are not common but include constipation, sleepiness, or head shaking. Do not use in pets that are allergic to the medication.

• Ophytrium

  Ophytrium is an ingredient extracted from Japanese mondo grass (Ophipogon japonicus) that is used in several topical treatments (i.e., Douxo® S3 products). It is used on dogs and cats with oily to flaky skin. It is believed to help control odor and dandruff, soothe and hydrate the skin, maintain the skin barrier, untangle the fur, and soften the coat.

• Orbifloxacin

  Orbifloxacin is given by mouth and is used on and off label to treat certain susceptible bacterial infections. Give as directed by your veterinarian. The most common side effects include vomiting, diarrhea, and lack of appetite. Do not use in pets that are allergic to it or other quinolones, in growing pets, or in conjunction with cyclosporine. If a negative reaction occurs, please call your veterinary office.