In this research work seventeen urea derivatives, including five new derivatives N-mesityl-N'-(3-methylphenyl)urea (2), N-(3-methoxyphenyl)-N'-(3-methylphenyl)urea (4), N-mesityl-N'-(4-methylphenyl)urea (6), N-(1,3-benzothiazol-2-yl)-N'-(3-methylphenyl)urea (9) and N-(2-methylphenyl)-2-oxo-1-pyrrolidinecarboxamide (15) have synthesized by reacting ortho, meta and para tolyl isocyanate with primary and secondary amines by previously reported method. We exhibited all series (1-17) to urease, ?-glucuronidase and snake venom phosphodiesterase enzyme inhibition assays. The ranges of % inhibition for urease, ?-glucuronidase and phosphodiesterase enzymes were 0.3-45.3, 4.9-44.9 and 1.2-46.4 % respectively. Moreover, the effect of these compounds on prostate cancer cell lines was also observed. The new compound N-(1,3-benzothiazol-2-yl)-N'-(3-methylphenyl)urea (9) showed in vitro anticancer activity with IC50 value of 78.28 ? 1.2 ?M. All the compounds were characterized by state of art spectroscopic techniques.