A patient suffers from bronchial asthma. Which of the following medications is a mixed-acting adrenergic drug that may be administered?
A) Epinephrine
B) Ephedrine
C) Pseudoephedrine
D) Isoproterenol
B
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Ephedrine is a mixed-acting adrenergic drug that acts by stimulating alpha1 and beta receptors and causing release of norepinephrine from presynaptic terminals. It is used in the treatment of bronchial asthma. Epinephrine is not a mixed-acting adrenergic drug. Pseudoephedrine is a related drug, stimulating alpha1 and beta receptors. It is used as a nasal decongestant. Isoproterenol is a synthetic catecholamine that acts on beta1- and beta2-adrenergic receptors.
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