Fluconazole, sold under the brand name Diflucan, is an antifungal medication that veterinarians prescribe to treat systemic fungal infections in dogs. While most dogs never encounter these infections, those that do require long-term treatment that can last weeks to years.
Systemic fungal infections occur when fungal organisms spread throughout a dog's body rather than remaining localized to the skin or ears. These infections can stem from various fungi that dogs may inhale or ingest in their environment. Common culprits include Candida species, Cryptococcus, and Blastomyces, depending on geographic location and exposure.
Fluconazole works by disrupting the cell membrane of fungal organisms, stopping their growth and allowing the dog's immune system to fight the infection. Veterinarians often choose this medication because it distributes well throughout the body and reaches tissues that topical antifungals cannot reach. Dogs absorb the medication orally, making it easier to administer than injectable alternatives.
Treatment duration depends on the type and severity of the fungal infection. Dogs with cryptococcal infections might need fluconazole for several months, while those with blastomycosis may require treatment for a year or longer. Regular veterinary monitoring helps track progress, as your vet will likely recommend periodic bloodwork to assess kidney and liver function, since fluconazole does process through these organs.
Side effects in dogs remain relatively uncommon but can include nausea, vomiting, diarrhea, and appetite loss. Some dogs experience mild elevation in liver enzymes during treatment. Serious reactions are rare when veterinarians prescribe appropriate doses.
Pet owners should give fluconazole exactly as prescribed, typically with food to improve absorption and reduce stomach upset. Never stop treatment early, even if your dog seems better, as premature discontinuation