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Metronidazole For Pets (Antibiotic)
PRESCRIPTION MEDICATION - RX Required
Metronidazole is a prescription antibiotic and antiprotozoal medication used in dogs and cats, most often for gastrointestinal infections. It is effective against anaerobic bacteria and protozoal parasites such as Giardia, and is commonly prescribed for infectious diarrhea and related GI conditions. Smarty Vets carries 250 mg and 500 mg tablets (generic Flagyl) and Ayradia 125 mg/mL oral suspension.
Key facts
- Active ingredient: metronidazole
- Species: dogs and cats
- Available options: 250 mg tablets (100 count), 500 mg tablets (100 count), and Ayradia 125 mg/mL oral suspension (30 mL bottle)
- Form: oral tablets or oral suspension
- Typical uses: Giardia and other protozoal infections, anaerobic bacterial infections, and diarrhea or inflammatory GI disease as directed by a veterinarian
- Prescription: yes — veterinary authorization required
How to use
Dosing is determined by your prescribing veterinarian based on your pet's weight, species, and the condition being treated. Metronidazole is usually given twice daily and may be given with food to reduce stomach upset. The tablets have a bitter taste, so avoid crushing them. Complete the full course even if symptoms resolve early.
Safety information
Common side effects include nausea, vomiting, decreased appetite, and drooling (from the bitter taste). Use with caution in pets with liver disease, and tell your veterinarian about all other medications your pet is taking. High doses or prolonged use can rarely cause neurologic signs such as unsteadiness, tremors, or unusual eye movements — contact your veterinarian immediately if these occur. Not recommended for pregnant or nursing pets without veterinary advice. Store in a cool, dry place away from light.
Frequently asked questions
What is metronidazole used for in dogs and cats?
Veterinarians prescribe it for Giardia and other protozoal infections, anaerobic bacterial infections, and diarrhea or gastrointestinal inflammation.
How fast does metronidazole work for diarrhea?
Many pets improve within one to three days, but the full prescribed course should always be completed to keep the infection from returning.
Why does my pet drool after taking metronidazole?
The medication is very bitter. Drooling or foaming is common if a pet tastes it — giving tablets whole in a small treat or using the flavored suspension can help.
Do I need a prescription for metronidazole?
Yes. It is a prescription medication, so a valid veterinarian-client-patient relationship and vet authorization are required before it can be dispensed.
What serious side effects should I watch for?
Neurologic signs — stumbling, tremors, head tilt, or unusual eye movements — are rare but important. Stop the medication and call your veterinarian if you see them.