Metronidazole Suspension: Compounded Antibiotic for Pets - PCAB
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Metronidazole Suspension (Compounded) Rx

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Metronidazole Suspension (Compounded)

Metronidazole is a prescription antibiotic and antiprotozoal. It is commonly used in the treatment of certain bacterial infections and intestinal parasites. This medication works by disrupting the DNA in the infecting organism. If your pet has been diagnosed with an infection or has contracted an intestinal parasite, your veterinarian may prescribe Metronidazole. Talk with your veterinarian before administering this medication and follow their recommendations. Metronidazole is a compounded oral suspension that is available in different strengths and flavors for flexible dosing.


Metronidazole Suspension Beyond Use Date:

It is recommended that compounded Metronidazole suspension be used within 3 months. Due to the shelf life of this medication, please limit orders to an 80 day supply.


  • Read and follow the prescription label carefully for storage information, possible side effects, and drug interactions.
  • Give the exact amount prescribed and only as often as directed.
  • Do not skip doses or stop giving the medication without consulting your veterinarian.
  • For additional information, click the “More Info” and “Package Insert” tabs listed above.


Metronidazole's Client Information Sheet for pet parent reference opens in a new window.

Metronidazole (Veterinary) Medication Fact Sheet

Description of Medicine:

This medication is used to treat various infections.  Metronidazole is an antibacterial, antiparasitic, and antiprotozoal agent.  It works by disrupting the DNA in the infecting organism.

Cautions and Warnings:

This medication should not be used in animals hypersensitive to metronidazole (Flagyl) or tinidazole (Tindamax).  Metronidazole should be used cautiously in pregnancy.  Please contact your veterinarian if pregnancy is a possibility.  Metronidazole should be used with caution and may require a dosage adjustment in animals with liver dysfunction. 

How to Use this Medication:

The dosing and duration of this medication is individualized and may vary for each animal.  Follow the instructions from your pet's veterinarian as well as the following recommendations:

  • Capsules:  Should be swallowed whole if possible.  Capsules may be opened to sprinkle content over food.  Please note that if capsule is sprinkled over food, all food should be ingested to ensure proper dosage.
  • Suspension: Shake well prior to each dose and use appropriate syringe to ensure proper dosage. Dosage should be administered directly into the animal’s mouth if possible.  If needed, dosage may be squirted onto food.  Please note that if dosage is placed on food, all food should be ingested to ensure proper dosage.
  • Transdermal:  Supplied in multi-dose syringes; verify dose prior to administration.  Use a finger cot or glove to administer medication.

Possible Side Effects:

Side effects tend to be dose-related.  Metronidazole’s most severe side effect is dose-related CNS toxicity. Metronidazole may cause lethargy, CNS depression, ataxia (disordered movements), nausea, vomiting, diarrhea, weakness, neutropenia (decreased white blood cells), liver toxicity, hematuria (blood in the urine), and anorexia.

Beyond Use Date:

  • Capsules: It is recommended that this product be used within 180 days.
  • Suspension: It is recommended that this product be used within 90 days.
  • Transdermal: It is recommended that this product be used within 30 days.

Storage Requirement:

  • Store metronidazole at room temperature, protected from light.
  • Keep out of reach from children to avoid accidental ingestion.



  1. Plumb DC. Metronidazole. Plumb’s Veterinary Drug Handbook. 5th ed. 2005.
  2. Papich MG. Metronidazole. Saunders Handbook of Veterinary Drugs. 2nd 2007.