Drug General Information (ID: DDIIYO9BVN)
  Drug Name Ranitidine Drug Info Memantine Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Antiulcer Agents Cholinesterase Inhibitors
  Structure

 Mechanism of Ranitidine-Memantine Interaction (Severity Level: Minor)
     Competitive inhibition of renal tubular secretion Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Ranitidine Memantine
      Mechanism Competitive inhibition of renal tubular secretion of midodrine Midodrine
      Key Mechanism Factor 1
Factor Name Renal tubular secretion
Factor Description Renal tubular secretion allows selective transfer of substances from the blood around the capillaries into the renal tubules via filtrate. Drug excretion may be reduced when two drugs compete for renal tubular secretion.
      Mechanism Description
  • Decreased elimination of Memantine caused by Ranitidine mediated competitive inhibition of renal tubular secretion

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 Min DI, Ku YM, Geraets DR, Lee HC "Effect of grapefruit juice on the pharmacokinetics and pharmacodynamics of quinidine in healthy volunteers." J Clin Pharmacol 36 (1996): 469-76. [PMID: 8739026]
3 Product Information. Namenda (memantine). Forest Pharmaceuticals, St. Louis, MO.