Drug General Information (ID: DDIY7R19TB)
  Drug Name Probenecid Drug Info Baricitinib Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Uricosuric Agents Antirheumatics
  Structure

 Mechanism of Probenecid-Baricitinib Interaction (Severity Level: Major)
     Transporter inhibition Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Probenecid Baricitinib
      Mechanism OAT3 inhibitor OAT3 substrate
      Key Mechanism Factor 1
Factor Name Solute carrier family 22 member 8
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Structure Sequence
MTFSEILDRVGSMGHFQFLHVAILGLPILNMANHNLLQIFTAATPVHHCRPPHNASTGPWVLPMGPNGKPERCLRFVHPPNASLPNDTQRAMEPCLDGWVYNSTKDSIVTEWDLVCNSNKLKEMAQSIFMAGILIGGLVLGDLSDRFGRRPILTCSYLLLAASGSGAAFSPTFPIYMVFRFLCGFGISGITLSTVILNVEWVPTRMRAIMSTALGYCYTFGQFILPGLAYAIPQWRWLQLTVSIPFFVFFLSSWWTPESIRWLVLSGKSSKALKILRRVAVFNGKKEEGERLSLEELKLNLQKEISLAKAKYTASDLFRIPMLRRMTFCLSLAWFATGFAYYSLAMGVEEFGVNLYILQIIFGGVDVPAKFITILSLSYLGRHTTQAAALLLAGGAILALTFVPLDLQTVRTVLAVFGKGCLSSSFSCLFLYTSELYPTVIRQTGMGVSNLWTRVGSMVSPLVKITGEVQPFIPNIIYGITALLGGSAALFLPETLNQPLPETIEDLENWSLRAKKPKQEPEVEKASQRIPLQPHGPGLGSS
Gene Name OAT3
Uniprot ID S22A8_HUMAN
KEGG Pathway hsa:9376
Protein Family Major facilitator (TC 2.A.1) superfamily
Protein Function
Plays an important role in the excretion/detoxification of endogenous and exogenous organic anions, especially from the brain and kidney. Involved in the transport basolateral of steviol, fexofenadine. Transports benzylpenicillin (PCG), estrone-3-sulfate (E1S), cimetidine (CMD), 2,4-dichloro-phenoxyacetate (2,4-D), p-amino-hippurate (PAH), acyclovir (ACV) and ochratoxin (OTA).
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      Mechanism Description
  • Decreased clearance of Baricitinib due to the transporter inhibition by Probenecid 

Recommended Action
      Management The dosage of baricitinib should be reduced by one-half during coadministration with potent OAT3 inhibitors. For the treatment of rheumatoid arthritis, baricitinib dosage should be reduced from 2 mg once daily to 1 mg once daily. For the treatment of COVID-19, the FDA Emergency Use Authorization fact sheet recommends reducing the baricitinib dosage as follows: (1) If the recommended dosage is 4 mg once daily, reduce to 2 mg once daily (2) If the recommended dosage is 2 mg once daily, reduce to 1 mg once daily (3) If the recommended dosage is 1 mg once daily, consider discontinuing the OAT3 inhibitor. Patients should be monitored for adverse effects of baricitinib such as infections, malignancies, thrombosis, hematologic abnormalities, gastrointestinal perforations, hyperlipidemia, and hepatic transaminase elevations.

References
1 Cerner Multum, Inc. "Australian Product Information.".
2 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
3 US Food and Drug Administration "Emergency Use Authorization. Emergency Use Authorization (EUA) information, and list of all current EUAs."