<unk> s are a class of drugs and natural substances with effects on many excitable cells of the body, like the muscle of the heart, smooth muscles of the vessels or neuron cells. The latter are used as antiepileptics and are not covered in this article.
The main action of<unk> s is to decrease the blood pressure.  It is for this action that it is used in individuals with hypertension.
Calcium channel blocker
Alpha blocker
ACE inhibitor
PDE-5 inhibitor
PDE5 inhibitor
Beta-adrenergic agonist
PDE3 inhibitor
Phosphodiesterase inhibitors