Abstract Twelve new 1-(4-substituted-phenyl)-3-(4-oxo-2-methyl-4H-quinazolin-3-yl)-urea were synthesized and screened for anticonvulsant, CNS depressant, and sedative-hypnotic activity. After ip injection to mice at doses of 30, 100, and 300 mg/kg body weight 2, 3- Disubstituted-quinazolin-4 (3H)-one were examined in the maximal electroshock-induced seizures (MES) and subcutaneous pentylenetetrazole (scPTZ) induced seizure models in ...