In recent past year so many specialized works on heterocyclic chemistry have appeared because it is vastly expanding. In so many books we cannot find the attention toward the application part or pharmacological uses which it deserves. Heterocyclic compound has numerous applications in agriculture, medicine, pharmacy and allied field. The presented work is meant primarily for the manifold application of the heterocyclic compound. This work is not under any particular syllabus but may graduate, post graduate, student of biochemistry, research scholar immensely benefited from it.