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Question: Which of the following drugs is an nonselective beta receptor antagonist?

Metoprolol
Atenolol
Propranolol
Acebutolol

Answer: Propranolol

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Question: Which of the following drugs is an nonselective beta receptor antagonist?

Metoprolol
Atenolol
Propranolol
Acebutolol


Answer:

Propranolol Source: CoolInterview.com



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Related Questions
View Answer
Indicate the beta1-selective antagonist:

Propranolol
Metoprolol
Carvedilol
Sotalol
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Which of the following agents is a beta2–selective antagonist?

Tolazolin
Pindolol
Ergotamin
Butoxamine
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Indicate the beta adrenoreceptor antagonist, which has partial beta–agonist activity:

Propranolol
Metoprolol
Pindolol
Betaxolol
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Which of the following drugs is a reversible nonselective alfa, beta antagonist?

Labetalol
Phentolamine
Metoprolol
Propranolol
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Indicate the indirect-acting adrenoreceptor blocking drug:

Tolazoline
Reserpine
Carvedilol
Prazosin
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The principal mechanism of action of adrenoreceptor antagonists is:

Reversible or irreversible interaction with adrenoreceptors
Depletion of the storage of catecholamines
Blockade of the amine reuptake pumps
Nonselective MAO inhibition
View Answer
Characteristics of alfa-receptor antagonists include all of the following EXCEPT:

They cause a fall in peripheral resistance and blood pressure
They cause epinephrine reversal (convert a pressor response to a depressor response)
Bronchospasm
They may cause postural hypotension and reflex tachycardia
View Answer
Which of the following drugs is an imidazoline derivative and a potent competitive antagonist at both alfa1 and alfa2
receptors?

Prazosin
Labetalol
Phenoxybenzamine
Phentolamine
View Answer
Characteristics of phentolamine include all of the following EXCEPT:

Reduction in peripheral resistance
Stimulation of responses to serotonin
Tachycardia
Stimulation of muscarinic, H1 and H2 histamine receptors
View Answer
The principal mechanism of phentolamine-induced tachycardia is:

Antagonism of presynaptic alfa2 receptors enhances norepinephrine release, which causes cardiac stimulation via unblocked beta receptors
Baroreflex mechanism
Direct effect on the heart by stimulation of beta1 receptors
Inhibition of transmitter reuptake at noradrenergic synapses
View Answer
Nonselective alfa-receptor antagonists are most useful in the treatment of:

Asthma
Cardiac arrhythmias
Pheochromocytoma
Chronic hypertension
View Answer
The main reason for using alfa-receptor antagonists in the management of pheochromocytoma is:

Inhibition of the release of epinephrine from the adrenal medulla
Blockade of alfa2 receptors on vascular smooth muscle results in epinephrine stimulation of unblocked alfa2 receptors
Direct interaction with and inhibition of beta2 adrenoreceptors
Antagonism to the release of rennin
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Which of the following drugs is useful in the treatment of pheochromocytoma?

Phenylephrine
Propranolol
Phentolamine
Epinephrine
View Answer
Indicate adrenoreceptor antagonist agents, which are used for the management of pheochromocytoma:

Selective beta2-receptor antagonists
Nonselective beta-receptor antagonists
Indirect-acting adrenoreceptor antagonist drugs
?lfa-receptor antagonists
View Answer
The principal adverse effects of phentolamine include all of the following EXCEPT:

Diarrhea
Bradycardia
Arrhythmias
Myocardial ischemia
View Answer
Indicate the reversible nonselective alfa-receptor antagonist, which is an ergot derivative:

Ergotamine
Prazosin
Phenoxybenzamine
Carvedilol
View Answer
Indicate an alfa-receptor antagonist, which binds covalently to alfa receptors, causing irreversible blockade of long
duration (14-48 hours or longer):

Phentolamine
Phenoxybenzamine
Ergotamine
Prazosin
View Answer
Compared with phentolamine, prazosin has all of the following features EXCEPT:

Irreversible blockade of alfa receptors
Highly selective for alfa1 receptors
The relative absence of tachycardia
Persistent block of alfa1 receptors
View Answer
Which of the following statements is not correct?

There are at least three subtypes of alfa1 receptors, designated alfa1a, alfa1b and alfa1d
ALFA1a subtype mediates prostate smooth muscle contraction
ALFA1b subtype mediates vascular smooth muscle contraction
ALFA1a subtype mediates both vascular and prostate smooth muscle contraction
View Answer
Indicate an alfa1 adrenoreceptor antagonist, which has great selectivity for alfa1a subtype:

Prazosin
Tamsulosin
Phenoxybenzamine
Phentolamine
View Answer

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