I got Omeprazole instead of Prilosec for my last prescription refill, not by my choice. I got dizzy within 30 minutes of taking the Omeprazole, and severe exhaustion. I am never taking that crap again, I just bought and downloaded an alternative guide to acid reflux from ****** published by Barton Publishing. I am going to give it a try ! I have basically wasted my day off today because between the dizziness, nausea, and the exhaustion, I don't have the energy to do any of my work I need to do at my house ! Oh yeah, another side affect I noticed: restlessness, a feeling of being overwhelmed for no reason... no more of this drug for me....