Thiazinamium chloride is primarily used in the medical field as an antihistamine and anticholinergic agent. It is effective in treating allergic reactions by blocking histamine receptors, thereby reducing symptoms like itching, sneezing, and runny nose. Additionally, its anticholinergic properties make it useful in managing excessive secretions in the respiratory tract, often seen in conditions like bronchitis or asthma. It is also employed in preoperative settings to reduce salivary and bronchial secretions, ensuring a safer and more controlled surgical environment.