Active ingredient


Drug description

Metronidazole is an antibiotic effective against anaerobic bacteria (those that grow in the absence of oxygen). 

In addition, it acts against certain types of intestinal parasites and influences the action of the immune system.


This product is used in dogs and cats to treat anaerobic bacterial infections as well as intestinal parasites such as Giardia.

It is also used to help treat diarrhea.


Do not use, unless advised by a veterinarian, if the animal is severely ill, if it is pregnant, if it is a newborn, if it has a liver problem or if it is intolerant to nitroimidazole derivatives.

For more information on this subject, it is best to discuss with a veterinarian or to consult the monograph that accompanies this product.

Neurological signs such as depression, pupil dilatation, involuntary oscillatory eye movements, disorientation, lack of motion coordination, a tilted head, proprioception deficits (loss of perception of limbs' position), an inability to expand limbs, tremors or convulsions.

In addition to neurological signs, the animal may lose appetite, be less active, have muscle weakness, blood in the urine, vomiting, nausea, diarrhea, liver toxicity and a decreased heart rate.

Metronidazole may also decrease the effectiveness of the immune system.

For more information on other possible side effects, please refer to the monograph that accompanies this product.

Interactions with other drugs

Metronidazole may interact with cimetidine, phenobarbital, phenytoin or warfarin .

It is important to advise the veterinarian if the animal is already receiving any of these medications when starting metronidazole.

Recommended monitoring

Make sure that the animal's condition improves and that it does not suffer from any side effects.


This medication should be stored at room temperature and protected from light. 

Excess heat or cold should be avoided.


The dose prescribed by the veterinarian must not be exceeded to avoid the risk of causing neurological toxicity in the animal. Since metronidazole is irritating to the stomach, it should be given with a meal.

In order not to promote the development of antimicrobial resistance, it is important to finish the prescription, even if the symptoms have disappeared before the end of it.

The product should be kept out of the reach of children and animals.

If neurological symptoms occur, or if side effects are worsening or persisting, contact a veterinarian as soon as possible.