Yikes! For 2 dive trips now, my Transderm Scop Patch has had zero effect. I'm one of those "see a wave and ralph" types of people, and for 2 years now, I've been using the Scop patch regularly (maybe 2 days per month for local dive trips, and for a week or two at a time for liveaboard trips). It has worked just great the entire time. I've been wearing it on my boob under my bathing suit, since hair gets stuck in it and rips it off if I wear it on my ear. The placement hasn't been a problem - the patch has worked like an absolute charm. The only side effect for me is dry mouth. Until my last two dive trips. Total green-ness. Yech. Totally ruined the trips. I didn't do anything differently. Has anybody else of you regular patch users had this experience? I can't find any information indicating that one can develop a tolerance to scopalomine, and my doctor doesn't know much about it (he's not a diver, sigh), but that's almost what it feels like. That or a QC problem, I dunno. I read the thread about the ear placement being necessary for dosage reasons, so I'll go back to that, but it's been working for 2 years now on my boob (same spot!), so I can't figure out what the problem is all of a sudden. Anybody out there having the same problem?