Final answer:
Sympatholytic drugs block or inhibit the effects of the sympathetic nervous system by acting as antagonists to the adrenergic receptors.
Step-by-step explanation:
The agents that block or inhibit the effect of the sympathetic nervous system are known as sympatholytic drugs. These substances function as antagonists to the adrenergic receptors (such as the α-adrenergic or β-adrenergic receptors), inhibiting the binding of neurotransmitters like norepinephrine or epinephrine. This action effectively 'cuts' or 'takes a blow' against the sympathetic influence on the target organ, resulting in a decreased sympathetic response.