Drug General Information (ID: DDI4R90XOI)
Drug Name			Quinidine		Drug Info		Magnesium hydroxide		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Group I Antiarrhythmics				Antacids/Laxatives
Structure

Mechanism of Quinidine-Magnesium hydroxide Interaction (Severity Level: Moderate)
Altered urine pH Click to Show/Hide Mechanism Graph
Drug Name		Quinidine				Magnesium hydroxide
Mechanism		Urine pH sensitive				Urine alkalinizer
Key Mechanism Factor 1
		Factor Name		Urine pH
		Factor Description		The normal range of urine pH is between 4.5 and 8, depending mainly on the hydrogen ion concentration. Changes in urine pH may significantly affect drug reabsorption and excretion.
Mechanism Description		Altered elimination of Quinidine caused by Magnesium hydroxide mediated altered urine pH

Recommended Action
Management		Caution is advised if quinidine is used with agents that can increase urinary pH. Quinidine levels may need to be monitored more closely following addition or discontinuation of these agents, and the quinidine dosage adjusted as necessary. Patients should be advised to seek medical attention if they experience symptoms that could indicate quinidine toxicity such as tinnitus, hearing loss, visual disturbances, diarrhea, headache, dizziness, palpitations, syncope, or irregular heartbeats.

References
1	Ace LN, Jaffe JM, Kunka RL "Effect of food and an antacid on quinidine bioavailability." Biopharm Drug Dispos 4 (1983): 183-90. [PMID: 6882885]
2	Romankiewicz JA, Reidenberg M, Drayer D, Franklin JE "The noninterference of aluminum hydroxide gel with quinidine sulfate absorption: An approach to control quinidine-induced diarrhea." Am Heart J 96 (1978): 518-20
3	Mauro VF, Mauro LS, Fraker TD Jr, Temesy-Armos PN, Somani P "Effect of aluminum hydroxide gel on quinidine gluconate absorption." DICP 24 (1990): 252-4