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Terazosin
Terazosin is useful in prostate diseases.
Tamsulosin
Selective alpha 1 a blocker, useful in benign prostatic hypertrophy, especially in those not having hypertension.
Yohimbine
Selective alpha 2 blocker, obtained from plant source. Its therapeutic importance is not established. Experiments are being done regarding its use in clonidine withdrawal, in which alpha 2 receptors are activated.
In diabetes mellitus, insulin is inhibited. Role is also being investigated in relief in depressive syndromes.
