Used as an antiprotozoal agent, particularly effective in the treatment of giardiasis, an intestinal infection caused by the parasite Giardia lamblia. It works by inhibiting the growth and reproduction of the parasite in the gastrointestinal tract. Quinfamide is valued for its low toxicity and high efficacy in both acute and chronic cases, making it suitable for use in pediatric and adult populations. It is often administered orally and has shown good patient tolerance with minimal side effects. Its application is primarily in regions where giardiasis is endemic, contributing to improved management of water- and food-borne parasitic diseases.