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• Levetiracetam

  Levetiracetam is given by mouth or injection and is used off label to treat seizures and epilepsy. Give as directed by your veterinarian. Common side effects include sleepiness and incoordination in dogs and decreased appetite, incoordination, drooling, and sleepiness in cats. Do not use levetiracetam in pets that are allergic to it. If a negative reaction occurs, please call your veterinary office.

• Levothyroxine

  Levothyroxine is thyroid hormone replacement given by mouth in the form of a tablet or capsule. It is used to treat hypothyroidism and its use in cats and certain exotic animals is off label. This medication should not be used in pets with certain heart conditions, untreated Addison's disease, or hyperthyroidism.

• Lidocaine/Lidocaine Combinations Topical

  Lidocaine/lidocaine combinations topical are local anesthetics that provide anesthesia (a numbing effect) to the skin in cats, dogs, and other animals. Combination products may contain other local anesthetics, antibiotics or antimicrobials, steroids, antihistamines, and/or cleansing agents.

• Lincomycin

  Lincomycin is given by mouth or injection and is used on and off label to treat certain bacterial infections. Give as directed by your veterinarian. Common side effects include vomiting, diarrhea, or drooling. Do not use in pets that are allergic to it or similar drugs, in pets with a candida fungal infection, very young pets, or in rabbits, hamsters, guinea pigs, or horses. If a negative reaction occurs, please call the veterinary office.

• Lokivetmab

  Lokivetmab is given by injection and is used on and off label to treat itchiness in dogs. Give as directed. Side effects are uncommon but may include vomiting, diarrhea, sleepiness, lack of appetite, or pain at the injection site. Do not use in pets that are allergic to it. If a negative reaction occurs, please call the veterinary office.

• Lomustine

  Lomustine is given by mouth and is used off label to treat certain cancers such as mast cell tumors and brain tumors. Give this medication as directed by your veterinarian. Common side effects include vomiting, diarrhea, lack of appetite, and hair loss. Do not use in pets that are severely allergic to it. If a negative reaction occurs, please call your veterinary office.

• Loperamide

  Loperamide is given by mouth and is used off label to treat signs of diarrhea. Give as directed by your veterinarian. Common side effects include constipation, bloat, and sleepiness. Do not use in pets that are allergic to it, that have diarrhea due to an infection or a toxin, or that are positive for the MDR1 gene. If a negative reaction occurs, please call your veterinary office.

• Lorazepam

  Lorazepam (brand names Ativan®, Lorazepam Intensol®) is a benzodiazepine medication used off label to treat behavior problems such as anxiety, fears, and phobias in cats and dogs. It can also be used to treat seizures or to stimulate appetite in cats. It is given by mouth or injection. Do not use in pets that are allergic to it or other benzodiazepines, or that have severe breathing problems, or liver disease. If a negative reaction occurs, please call your veterinary office.

• Lotilaner

  Lotilaner is used to treat and prevent flea infestations and treat and control tick infestations in dogs and cats. After being administered to a pet, lotilaner is distributed throughout the body. When fleas or ticks bite the dog or cat, they are exposed to the drug and killed during their blood meal.

• Low Molecular Weight Heparin

  Low molecular weight heparin is given by injection under the skin and is used off label to treat abnormal blood clots. Give as directed. Side effects may include pain at the injection site. Do not use in pets that are allergic to any type of heparin or pork products. If a negative reaction occurs, call the veterinary office.