drugs that inhibit the release of ADH by the posterior pituitary which will decrease absorption of water at the kidneys decreasing blood volume and thus BP.

Grapefruit juice is contraindicated when taking this type of medication because it can increase the amount of medicine that enters your blood stream. As a result, your blood pressure can drop very suddenly.

Drugs that block  α1-adrenergic receptors; this results in vasodilation, which results in the  lowering arterial blood pressure.

directly relaxing arteriolar smooth muscle by decreasing the phosphorylation of smooth muscle myosin light chain; this lowers arterial blood pressure by promoting arteriolar vasodilation and reducing TPN.

drugs that block beta-adrenergic receptors; this  prevents norepinephrine (noradrenaline) and epinephrine (adrenaline) from stimulating these receptors.

These drugs block the effect of sympathetic nerves to cause vasoconstriction of blood vessels.

receptors found on the SA and AV nodal cells of the heart. Acetylcholine can bind and cause a decrease in heart rate.

block the release of norepinephrine from sympathetic endings; lowers blood pressure by preventing this vasoconstrictor effect.

Drugs that act on the medulla oblongata to reduce sympathetic output; lowers B/P by preventing the effect of sympathetic activity and promoting arteriolar vasoconstriction.

This type of drug blocks calcium channels reducing the entry of calcium into myocardial cells and smooth muscle cells of arteriole blood vessel walls. This results in lower BP.

receptors found on autorhythmic cells of the heart such as the SA node and contractile myocardiocytes. Norepinephrine and epinephrine can bind and cause an increase in heart rate and contractile strength

Sometimes these drugs are referred to as sympatholytic because they opposes the downstream effects of organs innervated by the sympathetic nervous system.