Omeprazole Side Effects: How long do the side effects stay with you?? I have been off for http://www.medications.com/effect/view/33804 How long do the side effects stay with you?? I have been off for 3 weeks now and still experience light headed and fogginess. Is this normal? Everything else has tested normal. Please Reply Thanks Andy Hi Andy, I have the same symptoms its been more than a year it Thu, 27 Nov 2008 18:44:20 -0500 http://www.medications.com/effect/view/33804?item=14865 Hi Andy, I have the same symptoms its been more than a year it didn't go away. I had high blood pressure and was using athenolol and had pains around my chest. I went to doctor and it was related with my stomach so I started Omeprazole 20mg and used it http://www.medications.com/effect/view/33804?item=14865