It is a direct smooth muscle relaxant, which have a prominent action vascular smooth muscles preferentially veins than arteries. It is enzymatically denitrated in the smooth muscle cells to release the reActive free radical nitric oxide which Activates cytosolic guanylyl cyclase thus increases cyclic GMP levels which causes dephosphorylation of myosin light chain kinase(MLCK) through a cyclic GMP dependent protein kinase. Reduced availability of phosphorylated (Active) MLCK interferes with Activation of myosin and myosin fails to interact with actin to cause contraction and consequently relaxation occurs. Elevated levels of cyclic GMP also reduce calcium entry which also contributing to relaxation. It dilates veins more than arteries because veins have greater amount of enzyme that generate nitric oxide from nitrates. It also preferentially dilates epicardial arteries than autoregulatory arteries duo to defferential distribution of nitrate metabolizing enzymes in these vessels.

Communicate to your doctor or pharmacist before taking Imdur Tablet 30's if a patient has low performing thyroid gland, iundernourished because of a poor diet, has severe liver/kidney problems, suffers from hypothermia (very low body temperature), suffers from very poor blood circulation, has had any lethal damage to heart such as a heart attack or suffers from a disease called glaucoma (increased pressure in the eye).