Allylamine hydrochloride is primarily used in the synthesis of antifungal agents, particularly in the production of terbinafine, a medication effective against fungal infections like athlete's foot, ringworm, and nail fungus. It serves as a key intermediate in pharmaceutical manufacturing, enabling the development of compounds that inhibit fungal growth. Additionally, it finds application in organic synthesis, where it acts as a building block for creating various chemical compounds. Its role in the production of specialized polymers and coatings is also notable, contributing to materials with enhanced properties.