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Sadly, there is too little data for anyone to give an authoritative opinion on the use of anti-emetics but, if they are not sedating, personally, I see no THEORETICAL problem but this is not a recommendation.AquaTec once bubbled...
I use sudafed and have never experienced a problem. . .
With dives as far outside of recreational limits as you are entertaining, it's best that one be entirely drug free, period.