Tolerance to the antihistamine effect (tiredness and feeling spaced out) is reported as occurring within 7 - 10 days. That was my experience, and seems to be that of most of the posts I have seen.
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Tolerance to the antihistamine effect (tiredness and feeling spaced out) is reported as occurring within 7 - 10 days. That was my experience, and seems to be that of most of the posts I have seen.
Last edited by hanshan; 04-09-16 at 12:08.
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