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Your earlier post did not include Levocetirizine (Xyzal); is there any significant difference between it and the other 2nd-generation medications? Also, for eyes, what about Ketotifen (Alaway)? I've found both to be helpful, Xyzal more so than Claritin etc.; Alaway more so than Systane or other wetting drops. I know efficacy will vary with the individual, but is there any more general evidence regarding either? Thanks.

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