ld-3098 hydrochloride

Cirazoline hydrochloride is a competitive full agonist of the α1A-adrenergic receptor (α1A-AR; Ki: 120 nM). It is a partial agonist at α1B-AR (Ki: 960 nM) and α1D-AR (Ki: 660 nM).

Cirazoline (free base) is a full agonist at the α1A adrenergic receptor, a partial agonist at both the α1B and α1D adrenergic receptors, and a nonselective antagonist to the α₂ adrenergic receptor. It is believed that this combination of properties could make cirazoline an effective vasoconstricting agent.