Cognition, oxidative stress and vitamin B12 levels evaluation on patients under long-term omeprazole use.

Objectives: To evaluate the differences concerning cognitive performance, oxidative stress and vitamin B12 levels in omeprazole users under treatment for longer than six months.

Methods: A case-control study was developed with 44 omeprazole users (OU; 81.8 % female, 66 ± 8.