Metronidazole for Dogs and Cats

Overview of Metronidazole for Cats and Dogs

Metronidazole is a synthetic antibiotic and antiprotozoal used to treat and prevent bacterial infections and certain parasitic infections in dogs and cats.

This drug is not approved for use in animals by the Food and Drug Administration, but it is prescribed legally by veterinarians as an extra-label drug.

Brand Names

• This drug is registered for use in humans only.
• Human formulations: Flagyl® (Searle), Metric 21® (Fielding), Protostat® (Ortho), and Metro® (McGaw). Metronidazole is supplied by numerous drug companies with a variety of trade names and various generic formulations.
• Veterinary formulations: None

What Is Metronidazole Used for Dogs and Cats?

Metronidazole is prescribed to treat or control infections caused by susceptible bacteria and parasites. It is effective against infections caused by Giardia, Trichomonas, and Balantidium coli. The drug is not effective against viruses.

Metronidazole Side Effects for Cats and Dogs

While generally safe and effective when prescribed by a veterinarian, metronidazole can cause side effects in some animals.

Negative reactions to the drug may include:

• Liver damage
• Loss of appetite
• Neurological disorders
• Sluggishness
• Weakness

Prolonged use or overdoses can cause severe neurological reactions.

These may exhibit themselves in symptoms including:

• Ataxia
• Disorientation
• Head tilting
• Nystagmus
• Rigidity
• Seizures
• Tremors

Metronidazole should only be cautiously administered to pregnant pets and never administered to pets with liver disease. Additionally, the drug may react to other medications that your dog or cat is already taking. These include phenobarbital and cimetidine.

Metronidazole Dosage for Dogs and Cats

Medication should never be administered without first consulting your veterinarian. If you're concerned about costs related to medication, pet insurance may be able to help. Click here to learn more.

Solid metronidazole is available in the following forms:

• 250 milligram tablets
• 500 milligram tables
• 375 milligram capsules

The drug also comes in the following liquid quantities:

• 500 milligram vials
• 5 milligram/milliliter injectable solutions

The typical metronidazole dosage for cats and dogs ranges from 5 to 30 milligram per pound (10 to 60 mg per kilogram) one to four times a day.

The duration of administration depends on the condition being treated, the pet’s response to the medication, and the development of any adverse effects. Be certain to complete the prescription unless specifically directed by your veterinarian. Even if your pet feels better, completing the entire treatment plan could prevent your pet’s symptoms from returning.

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