<prompt> Therapeutic drug monitoring of plasma concentrations of antihypeensive drugs is not practiced because:Determination of plasma level of these drugs is quite tedious and long processIt is easier to measure the effect of these drugsAntihypeensive effect do not increase linearly with the doseAll antihypeensive drugs are prodrugs  <response>: TDM is done for drugs with narrow therapeutic index whose response cannot be monitored by simple laboratory parameters. Antihypeensive effect can be easily measured, therefore TDM is not required. 