α-ADRENERGIC BLOCKING AGENTS
                               
1. NONEQUILIBRIUM TYPE
     β-Haloalkylamines:
                Phenoxybenzamine

2. EQUILIBRIUM TYPE (COMPETITIVE)
    a. Nonselective
        1. Ergot alkaloids:
                Ergotamine
                Ergotoxine

        2. Hydrogenated ergot alkaloids:
                Dihydroergotamine (DHE)
                Dihydroergotoxine

        3. Imidazolines:
                Tolazoline
                Phentolamine

        4. Miscellaneous:
                Chlorpromazine
                Ketanserin

    b. α1 Selective:
                Prazosin
                Terazosin
                Doxazosin
                Alfuzosin
                Tamsulosin

    c. α2  selective: 
                Yohimbine