Pindolol is a beta blocker drug.

Pharmacology

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Pindolol is a nonselective beta blocker in terms of cardioselectivity, but possesses ISA (Intrinsic Sympathomimetic Activity). This means that pindolol particularly in high doses exerts effects like epinephrine or isoproterenole (increased pulse rate, increased blood pressure, bronchodilation), but these effects are limited. Pindolol also shows membrane stabilizing effects like quinidine, possibly accounting for its antiarrhythmic effects. It acts on serotonin (5-HT1A) receptors in the brain resulting in increased postsynaptic serotonin concentrations.

Pharmacokinetics in healthy persons and those with kidney or liver disease

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Pindolol is rapidly and well absorbed from the GI tract. It undergoes some first-pass-metabolization leading to an oral bioavailability of 50 to 95%. Patients with uremia may have a reduced bioavailability. Food does not alter the bioavailability, but may increase the resorption. Following an oral single dose of 20mg peak plasma concentrations are reached within 1 to 2 hours. The effect of Pindolol on pulse rate (lowering) is evident after 3 hours. Despite the rather short halflife of 3 to 4 hours, hemodynamic effects persist for 24 hours after administration. Plasma halflives are increased to 3 - 11.5 hours in patients with renal impairment, to 7 - 15 hours in elderly patients, and from 2.5 to 30 hours in patients with liver cirrhosis. Approximately 2/3 of pindolol are metabolized in the liver giving hydroxylates, which are found in the urine as gluconurides and ethereal sulfates. The remaining 1/3 of pindolol is excreted in urine in unchanged form.

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