Antihistamines block the actions of histamine at the
1. H1 receptor site.
2. B1 receptor site.
3. B2 receptor site.
4. C1 receptor site.
Correct Answer: 1
Rationale 1: The H1 receptor site is the site for blocking histamine with the use of antihistamines.
Rationale 2: The B1 receptor site does not play a role in blocking histamine.
Rationale 3: The B2 receptor site does not play a role in blocking histamine.
Rationale 4: C1 is not a site of histamine release.
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