Drug General Information (ID: DDI2KFLY0P)
Drug Name			Omeprazole		Drug Info		Salsalate		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Antiulcer Agents				Antiinflammatory Agents
Structure

Mechanism of Omeprazole-Salsalate Interaction (Severity Level: Minor)
Altered gastric pH Click to Show/Hide Mechanism Graph
Drug Name		Omeprazole				Salsalate
Mechanism		Gastric alkalinizer				Gastric pH sensitive
Key Mechanism Factor 1
		Factor Name		Gastric pH
		Factor Description		The normal pH range of gastric acid is between 1.5 and 3.5 and is highly acidic, consisting mainly of hydrochloric acid. Changes in the pH of the stomach can alter the absorption of drugs.
Mechanism Description		Decreased absorption of Salsalate due to altered gastric pH caused by Omeprazole

References
1	Miner PB Jr, Fort JG, Zhang Y. Intragastric acidity and omeprazole exposure during dosing with either PA32540 (enteric-coated aspirin 325?mg + immediate-release omeprazole 40?mg) or enteric-coated aspirin 325?mg + enteric-coated omeprazole 40?mg - a randomised, phase 1, crossover study.?Aliment Pharmacol Ther. 2013;38(1):62-71. [PMID: 23692061]
2	Inarrea P, Esteva F, Cornudella R, Lanas A "Omeprazole does not interfere with the antiplatelet effect of low-dose aspirin in man." Scand J Gastroenterol 35 (2000): 242-6. [PMID: 10766315]
3	Nefesoglu FZ, Ayanoglu-Dulger G, Ulusoy NB, Imeryuz N "Interaction of omeprazole with enteric-coated salicylate tablets." Int J Clin Pharmacol Ther 36 (1998): 549-53. [PMID: 9799060]