Pharmacogenetic and Pharmacokinetics of Naproxen and Associated Naproxen-esomeprazole

20 phenotyped for CYP2C9 and CYP2C19 (by PCR) and for the pharmacokinetics of naproxen, saliva samples will be collected of these patients at different times after ingestion of a tablet of naproxen (500mg) (before, 0,25; 0,5; 0,75; 1; 1,5; 2; 3; 4; 5; 6; 8; 11; 24; 48; 72 e 96 hours after ingestion).

20 phenotyped for CYP2C9 and CYP2C19 (by PCR) and for the pharmacokinetics of naproxen-esomeprazole, saliva samples will be collected of these patients at different times after ingestion of a tablet of naproxen-esomeprazole (500mg+20mg) (after one month of the first collection) (before, 0,25; 0,5; 0,75; 1; 1,5; 2; 3; 4; 5; 6; 8; 11; 24; 48; 72 e 96 hours after ingestion).