Metronidazole is a medication vets often prescribe for tummy troubles like diarrhea or colitis, parasites such as giardia, inflammation in the gut (including IBD), and infections in the mouth, wounds, or digestive system. It works as both an antibiotic and an antiparasitic, and it also has anti-inflammatory properties, particularly in the digestive tract.

While it can be effective, it’s not without risks. Some pets tolerate it well, but others may experience side effects such as nausea, vomiting, loss of appetite, diarrhea, lethargy, “zoning out” behavior, wobbliness or tremors (especially at higher doses or longer use), liver stress or toxicity over time, and disruption of the gut microbiome. If your pet shows any neurological symptoms like stumbling or twitching, it’s important to stop the medication and contact your vet right away.

There are also holistic alternatives, depending on what you’re treating. For giardia or gut infections, options may include goldenseal for its antimicrobial effects, olive leaf extract to help fight pathogens, oregano oil as a strong natural antibiotic (only when properly diluted), clove or clove oil for protozoa like giardia, and garlic in carefully measured therapeutic amounts for its antiparasitic properties. For inflammation or ongoing digestive issues, soothing herbs like Slippery Elm or marshmallow root can help heal the gut lining, bone broth offers gentle nourishment, soil-based probiotics restore healthy gut flora, colostrum supports immune function and gut repair, and detoxifying approaches can help remove toxins while restoring balance to the microbiome.

If your dog or cat has a serious infection or is feeling very unwell, veterinary care is essential — sometimes medication is the safest choice. But for chronic concerns or milder cases, natural remedies can be valuable tools, and in some situations, a better long-term solution.