Fenmetozole tosylate is primarily used in research settings as a selective agonist for the imidazoline I1 receptor. It is employed to study the physiological and pharmacological roles of these receptors, particularly in the context of cardiovascular regulation. Researchers utilize it to explore its potential effects on blood pressure modulation and its interaction with the central nervous system. Its application is crucial in understanding the mechanisms of imidazoline receptors and their implications in therapeutic strategies for hypertension and related conditions.