Well, my brother got a little queezy on California Screamin', I did just fine. I got a little queezy on Orange Stinger.
Neither my brother nor I had problems with California Soarin'.
I was too chicken at the time to go on the Maliboomer.
Some people can get drowsy on Meclizine. It is an anti-histamine like Benadryl. If Benadryl or Diphenhydramine makes your drowsy, then there is a chance that Meclizine may as well.
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Past
DL multiple times
WDW offsite '92, Grosvenor '96, AS-Mu '98,
Disneyana Convention AS-Mu '00
Future
Disneyana Conv 2001 at GC
DIS Convention 2001 at Y&B
OKW and BWV New Years 2002