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Metronidazole is used by veterinarians to treat various conditions such as inflammatory bowel disease, nonspecific diarrheal disorders, infections caused by Giardia and periodontal disease. It is available as 250mg and 500mg tablets. The usual dose in dogs is 3-23mg/pound by mouth 1 to 4 times a day. The usual dose for cats is 5-23mg/pound by mouth 1 to 2 times a day. Duration of therapy depends on the type of condition and response to treatment. (sold per tablet)

Generic Name
Metronidazole (met-row-nid´┐Ż-ah-zole)


Brand Name(s)
Flagyl (Searle)

What is this medication used for
Metronidazole is an antimicrobial used in the treatment of Giardia infections, inflammatory bowel disease and infections in the mouth.

Metronidazole is available by prescription as tablets.

How this medicine should be used
Metronidazole is not FDA approved for use in veterinary medicine; however, it is a commonly accepted practice for veterinarians to use this medication in dogs and cats. The usual dose in dogs is 3-23mg/pound 1-4 times a day. The usual dose in cats is 5-23mg/pound 1-2 times a day. The actual dose and the duration of treatment depend on the specific condition being treated. Do not crush the tablet because it has a very bitter taste.

What are the side effects
Side effects of metronidazole may include nausea, loss of appetite, vomiting, diarrhea, drowsiness, rash and incoordination. This medication may discolor the urine reddish-brown.

What special precautions are there
This medication should not be used in animals allergic to it. Do not use in pregnant or nursing animals. Use with caution in animals with liver disease or blood disorders. Use with caution when given with phenytoin or anticoagulants such as warfarin. Always tell your veterinarian and pharmacist what other medications your pet is taking. Give this medication with food.

In the event of an overdose
Contact your veterinarian or veterinary emergency room. Symptoms of overdose may include loss of appetite, vomiting, disorientation and seizures.

How should I store this medication
Keep this medication in the container it came in, tightly closed. Store tablets at room temperature, away from excess heat, light and moisture. Do not store in the bathroom. Throw away any medication that is outdated or no longer needed. Keep this medication out of the reach of children and pets.

This information sheet is for educational purposes only and is intended to be a supplement to, and not a substitute for, the expertise and professional judgment of your veterinarian. The information is NOT to be used for diagnosis or treatment of your pet. You should always consult your own veterinarian for specific advice concerning the treatment of your pet.

The information is not intended to cover all possible uses, directions, precautions, warnings, allergic reactions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for your pet. It is not a substitute for a veterinary exam, and it does not replace the need for services provided by your veterinarian.

Note: Any trademarks are the property of their respective companies

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