TABLE 2.

Pharmacological profile of α‐ and β‐agonists on inhibitory motor responses in the rat colon.

Agonists	Antagonists that block the inhibitory response	Antagonists that do not block the inhibitory response
Phenylephrine (α‐adrenoceptor agonist)	Phentolamine: α‐adrenoceptor blocker Apamin: sKCa blocker Prazosin: α1‐adrenoceptor blocker RS17053: α1A‐adrenoceptor blocker a	Propranolol: β‐adrenoceptor blocker Yohimbine: α2‐adrenoceptor blocker
Isoprenaline (β‐adrenoceptor agonist)	Propranolol: β‐adrenoceptor blocker	Phentolamine: α‐adrenoceptor blocker

^a Preferential α_1A as it might also block α_1D‐adrenoceptor.