<prompt> Therapeutic drug monitoring of plasma concentration of antihypeensive drugs is not practiced becauseDetermination of plasma level of these drugs is quite tedious and long processIt is easier to measure the effect of these drugsAntihypeensive effect do not increases linearly with the doseAll Antihypeensive drugs are prodrugs  <response>: Ref-KDT 6e p34 TDM is done for drugs with narrow therapeutic index whose response cannot be monitored by clinical examination. Antihypeensive effect can be easily measured, therefore TDM is not required 