Thiabendazole is widely used as a fungicide and parasiticide in agriculture and medicine. In agriculture, it is applied to fruits, vegetables, and ornamental plants to prevent and control fungal infections such as mold, blight, and rot. It is particularly effective in post-harvest treatments to extend the shelf life of produce by inhibiting fungal growth during storage and transportation.

In the medical field, thiabendazole is used as an anthelmintic to treat infections caused by parasitic worms, including roundworms, hookworms, and pinworms. It works by disrupting the metabolic processes of the parasites, leading to their elimination from the host. Additionally, it has been explored for its potential anti-inflammatory and immunomodulatory properties in certain medical conditions.

In veterinary medicine, thiabendazole is employed to treat parasitic infections in livestock and pets, ensuring animal health and productivity. Its broad-spectrum activity and effectiveness make it a valuable tool in both agricultural and healthcare applications.