Whitehat wrote..

doctor considers loratadine safe for SLE patients and similar but not the active ingredient in Zyrtec, cetirizine, mostly due to the potential to interact with the quinine supplements and prescription meds

@Whitehat, FWIW, did a search on drugs.com (my favorite go-to on interactions) for med interactions of loratadine & ceterizine today. Apparently ceterizine has far more potential interactions than loatadine. Just wanted to pass it along.

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Glad I'm retired.