A series of phenylguanidine base compounds and their pharmaceutically acceptable acid addition salts have been found to be active as oral hypoglycemic agents. Preferred member compounds include N,N'-diphenyl-1-pyrrolidinocarboxamidine, N-phenyl-N'-methyl-N'-phenyl-1-pyrrolidinocarboxamidine and N-phenyl-N'-(p-chlorophenyl)-1-pyrrolidinocarboxamidine, and their hydrohalide acid addition salts. Synthetic routes leading to these compounds are described.
