A Patient Tells a Nurse That Antihistamines Help Relieve Cold

A patient tells a nurse that antihistamines help relieve cold symptoms and wants to know why they are not recommended or prescribed for this purpose. The nurse tells the patient that antihistamines provide only mild relief from some cold symptoms by:

A) anticholinergic properties that decrease rhinorrhea.
B) blocking H₁ receptors in nasal passages.
C) reducing secretions at H₂ receptor sites.
D) having sedative effects, which help patients rest and sleep.

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