Drug General Information (ID: DDIQPXE974)
Drug Name			Sulfasalazine		Drug Info		Telbivudine		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Antiinflammatory Agents				Antiviral Agents
Structure

Mechanism of Sulfasalazine-Telbivudine Interaction (Severity Level: Moderate)
Decreased renal excretion due to nephrotoxicity Click to Show/Hide Mechanism Graph
Drug Name		Sulfasalazine				Telbivudine
Mechanism		Nephrotoxicity				Primarily eliminated by renal excretion
Key Mechanism Factor 1
		Factor Name		Nephrotoxicity
		Factor Description		Drug-induced nephrotoxicity is a common and potentially serious complication of medication use. The kidneys are the primary organ for drug excretion, and when they are damaged can lead to decreased drug excretion.
Mechanism Description		Decreased renal excretion of Telbivudine caused by Sulfasalazine mediated nephrotoxicity

Recommended Action
Management		Caution is advised if telbivudine is prescribed in combination with potentially nephrotoxic drugs (e.g., aminoglycosides polypeptide, glycopeptide, and polymyxin antibiotics amphotericin B adefovir cidofovir tenofovir foscarnet cisplatin deferasirox gallium nitrate lithium mesalamine certain immunosuppressants intravenous bisphosphonates intravenous pentamidine high intravenous dosages of methotrexate high dosages and/or chronic use of nonsteroidal anti-inflammatory agents). Renal function should be evaluated prior to and during therapy with telbivudine.

References
1	Product Information. Tyzeka (telbivudine). IDEC Pharmaceuticals Corporation, San Diego, CA.