text: <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.
option_0: Calcium channel blocker
option_1: Alpha blocker
option_2: ACE inhibitor
option_3: PDE-5 inhibitor
option_4: PDE5 inhibitor
option_5: Beta-adrenergic agonist
option_6: PDE3 inhibitor
option_7: Phosphodiesterase inhibitors