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Phentolamine

Phentolamine is non selective reversible alpha blocker, histamine agonist (H1, H2) and muscarinic agonist. It also has inhibitory effects at serotonin receptors.

Pharmacokinetics

Oral absorption is unpredictable. Peak plasma levels are observed after 1 hour. Half life is 5-7 hours.

Uses

Used in pheocytochroma.

Adverse Effects

Its adverse affects include cardiac stimulation, postural hypertension, reflex tachycardia, headache, arrhythmias, diarrhea and palpitations.

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