Drug General Information (ID: DDINLSOD8H)
Drug Name			Atazanavir		Drug Info		Magnesium hydroxide		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Anti-Hiv Agents				Antacids/Laxatives
Structure

Mechanism of Atazanavir-Magnesium hydroxide Interaction (Severity Level: Moderate)
Altered gastric pH Click to Show/Hide Mechanism Graph
Drug Name		Atazanavir				Magnesium hydroxide
Mechanism		Gastric pH sensitive				Gastric alkalinizer
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 Atazanavir due to altered gastric pH caused by Magnesium hydroxide

Recommended Action
Management		Atazanavir should be administered 2 hours before or 1 hour after antacids or other oral agents with acid-neutralizing effects.

References
1	Product Information. Reyataz (atazanavir). Bristol-Myers Squibb, Princeton, NJ.
2	Ray JE, Marriott D, Bloch MT, McLachlan AJ "Therapeutic drug monitoring of atazanavir: surveillance of pharmacotherapy in the clinic." Br J Clin Pharmacol 60 (2005): 291-9. [PMID: 16120068]
3	Durant J, Clevenbergh P, Garraffo R, Halfon P, Icard S, DelGiudice P, Montagne N, Schapiro JM, Dellamonica P "Importance of protease inhibitor plasma levels in HIV-infected patients treated with genotypic-guided therapy: pharmacological data from the Viradapt Study." Aids 14 (2000): 1333-9. [PMID: 10930147]