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I know that first generation H1 antagonists, commonly known as antihistamines have anticholinergic effects. Their sedative side effects go away due to tolerance, but as for their anticholinergic side effects well that's something that is unknown to me at least. You might say use second generation H1 antagonists, but for this application the antiemetic effects that are unique to H1 antagonists that cross the BBB (i.e., first generation H1 antagonists) are desired.

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