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what is metronidazole used for in dogs

Author

Matthew Wilson

Updated on August 03, 2026

Metronidazole is used to treat protozoal infections in dogs and cats including Giardia, Entamoeba, Trichomonas, and Balantidium. It also is used to treat anaerobic bacterial infections. Metronidazole has immune-modulating activity and may be prescribed to treat inflammatory bowel disease.

How does metronidazole make dogs feel?

Metronidazole has a very bitter taste and often causes excessive salivation, drooling, gagging, or frothing at the mouth, especially in cats. In both cats and dogs, the bitter taste may also cause nausea and loss of appetite (anorexia), so pets taking metronidazole may eat less than usual or refuse meals altogether.

How long does it take for metronidazole for dogs to work?

Metronidazole should start to work in around one to two hours, though you may not notice the effects that fast. It can take a few days for a gradual improvement in symptoms to be visible.

Is metronidazole a strong antibiotic for dogs?

Metronidazole (also known by the brand names Flagyl, Metizol, Protostat, Metrogel) is a strong antibiotic primarily used as an antidiarrheal to treat inflammation of the large intestine. It’s also used for other illnesses and conditions in dogs, cats, and horses, as well as to treat bacterial infections in humans.

Why do vets prescribe metronidazole?

Metronidazole (Flagyl) is a popular antibiotic a vet may prescribe for a dog to treat diarrhea, inflammatory bowel disease, or gum disease. The most common side effect of metronidazole is diarrhea, even though it can be prescribed to treat diarrhea.

What causes intestinal bacterial infections in dogs?

It can be caused by infection with bacteria, viruses, parasites, medications, or even new foods. The condition often causes abdominal pain, diarrhea, vomiting, and/or other clinical signs.

Should metronidazole for dogs be taken with food?

Metronidazole should be given by mouth with food. Liquid forms must be shaken well before use. Metronidazole is very bitter, so take care not to crush these tablets as it will be difficult to administer to your pet. Follow the dosing instructions provided by your veterinarian.

How many days should I give my dog metronidazole?

How long will my dog be on metronidazole? The usual treatment period is 5 to 7 days. However, your veterinarian may wish to extend that time if the infection is not responding as well as expected. It’s important to remember to give all of the doses to your dog on a schedule.

Does metronidazole treat diarrhea?

Because metronidazole has activity against several diarrhetic agents, it has become the most frequently-used antibiotic for nonspecific diarrhea. But in some cases, it may be the wrong choice.

What can I give my dog to stop diarrhea fast?

A bland diet for 24 to 48 hours may help to resolve your pup’s issue. Plain-cooked white rice with a little chicken and some canned plain pumpkin (not pumpkin pie filling) may help to make your pup’s tummy feel better. Once your pooch feels better, gradually reintroduce their regular food.

What do you feed a dog that has diarrhea?

What to Feed a Dog With Diarrhea
1Lean Protein. Low-fat meats are gentle on your dog’s stomach, while still providing important protein. 2White Rice. White rice provides healthy calories without much flavor that could irritate the GI tract. 3Potatoes. 4Canned Pumpkin. 5Prescription Dog Food. 6Dog Food for Sensitive Stomachs.

Should metronidazole be taken with food?

The capsules can be taken with or without food. If the medicine upsets your stomach, it is best to take it with a meal or snack. The extended–release tablet must be taken without food, 1 hour before or 2 hours after a meal.

Is metronidazole toxic to dogs?

The chance of metronidazole toxicity may be low, but it is possible that it could affect your dog in a bad way. There are serious implications with metronidazole, such as neurological injury and hepatotoxicity (liver damage).

Is 500mg of metronidazole a lot for dogs?

If your dog has an infection from anaerobic bacteria, then you might expect your vet to prescribe 11 to 22 mg per pound to be given twice a day. Metronidazole tablets typically come in doses of 250 to 500 mg per pill. Your vet can give you advice on how to properly measure the dose for your dog.