Drug General Information (ID: DDIKERL5IA)
Drug Name			Salicylic acid (sodium)		Drug Info		Calcium carbonate		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Antiinflammatory Agents				Antacids/Minerals And Electrolytes
Structure

Mechanism of Salicylic acid (sodium)-Calcium carbonate Interaction (Severity Level: Moderate)
Altered urine pH Click to Show/Hide Mechanism Graph
Drug Name		Salicylic acid (sodium)				Calcium carbonate
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 Salicylic acid (sodium) caused by Calcium carbonate mediated altered urine pH

Recommended Action
Management		Patients treated chronically with antacids (or oral medications that contain antacids such as didanosine buffered tablets or pediatric oral solution) and large doses of salicylates (i.e. 3 g/day or more) should be monitored for potentially diminished or inadequate analgesic and anti-inflammatory effects, and the salicylate dosage adjusted if necessary.

References
1	Covington TR, Lawson LC, Young LL, eds. "Handbook of Nonprescription Drugs. 10th ed." Washington, DC: American Pharmaceutical Association (1993):.
2	Gaspari F, Vigano G, Locatelli M, Remuzzi G "Influence of antacid administrations on aspirin absorption in patients with chronic renal failure on maintenance hemodialysis." Am J Kidney Dis 11 (1988): 338-42
3	Levy G, Lampman T, Kamath BL, Garrettson LK "Decreased serum salicylate concentrations in children with rheumatic fever treated with antacid." N Engl J Med 293 (1975): 323-5