Drug General Information (ID: DDIT59R2U3)
  Drug Name Guanfacine Drug Info Bictegravir Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Antiadrenergic Agents Antiviral Agents
  Structure

 Mechanism of Guanfacine-Bictegravir Interaction (Severity Level: Moderate)
     Transporter inhibition Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Guanfacine Bictegravir
      Mechanism 1 MATE1 substrate MATE1 inhibitor
      Key Mechanism Factor 1
Factor Name Solute carrier family 47 member 1
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Structure Sequence
MEAPEEPAPVRGGPEATLEVRGSRCLRLSAFREELRALLVLAGPAFLVQLMVFLISFISSVFCGHLGKLELDAVTLAIAVINVTGVSVGFGLSSACDTLISQTYGSQNLKHVGVILQRSALVLLLCCFPCWALFLNTQHILLLFRQDPDVSRLTQTYVTIFIPALPATFLYMLQVKYLLNQGIVLPQIVTGVAANLVNALANYLFLHQLHLGVIGSALANLISQYTLALLLFLYILGKKLHQATWGGWSLECLQDWASFLRLAIPSMLMLCMEWWAYEVGSFLSGILGMVELGAQSIVYELAIIVYMVPAGFSVAASVRVGNALGAGDMEQARKSSTVSLLITVLFAVAFSVLLLSCKDHVGYIFTTDRDIINLVAQVVPIYAVSHLFEALACTSGGVLRGSGNQKVGAIVNTIGYYVVGLPIGIALMFATTLGVMGLWSGIIICTVFQAVCFLGFIIQLNWKKACQQAQVHANLKVNNVPRSGNSALPQDPLHPGCPENLEGILTNDVGKTGEPQSDQQMRQEEPLPEHPQDGAKLSRKQLVLRRGLLLLGVFLILLVGILVRFYVRIQ
Gene Name MATE1
Uniprot ID S47A1_HUMAN
KEGG Pathway hsa:55244
Protein Family Multi antimicrobial extrusion (MATE) (TC 2.A.66.1) family
Protein Function
Solute transporter for tetraethylammonium (TEA), 1-methyl-4-phenylpyridinium (MPP), cimetidine, N-methylnicotinamide (NMN), metformin, creatinine, guanidine, procainamide, topotecan, estrone sulfate, acyclovir, ganciclovir and also the zwitterionic cephalosporin, cephalexin and cephradin. Seems to also play a role in the uptake of oxaliplatin (a new platinum anticancer agent). Able to transport paraquat (PQ or N,N-dimethyl-4-4'-bipiridinium); a widely used herbicid. Responsible for the secretion of cationic drugs across the brush border membranes.
    Click to Show/Hide
      Mechanism Description
  • Decreased clearance of Guanfacine due to the transporter inhibition by Bictegravir 
      Mechanism 2 OCT2 substrate OCT2 inhibitor
      Key Mechanism Factor 2
Factor Name Solute carrier family 22 member 2
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Structure Sequence
MPTTVDDVLEHGGEFHFFQKQMFFLLALLSATFAPIYVGIVFLGFTPDHRCRSPGVAELSLRCGWSPAEELNYTVPGPGPAGEASPRQCRRYEVDWNQSTFDCVDPLASLDTNRSRLPLGPCRDGWVYETPGSSIVTEFNLVCANSWMLDLFQSSVNVGFFIGSMSIGYIADRFGRKLCLLTTVLINAAAGVLMAISPTYTWMLIFRLIQGLVSKAGWLIGYILITEFVGRRYRRTVGIFYQVAYTVGLLVLAGVAYALPHWRWLQFTVSLPNFFFLLYYWCIPESPRWLISQNKNAEAMRIIKHIAKKNGKSLPASLQRLRLEEETGKKLNPSFLDLVRTPQIRKHTMILMYNWFTSSVLYQGLIMHMGLAGDNIYLDFFYSALVEFPAAFMIILTIDRIGRRYPWAASNMVAGAACLASVFIPGDLQWLKIIISCLGRMGITMAYEIVCLVNAELYPTFIRNLGVHICSSMCDIGGIITPFLVYRLTNIWLELPLMVFGVLGLVAGGLVLLLPETKGKALPETIEEAENMQRPRKNKEKMIYLQVQKLDIPLN
Gene Name 44836
Uniprot ID S22A2_HUMAN
KEGG Pathway hsa:6582
Protein Family Major facilitator (TC 2.A.1) superfamily
Protein Function
Mediates tubular uptake of organic compounds from circulation. Mediates the influx of agmatine, dopamine, noradrenaline (norepinephrine), serotonin, choline, famotidine, ranitidine, histamine, creatinine, amantadine, memantine, acriflavine, 4-[4-(dimethylamino)-styryl]-N-methylpyridinium ASP, amiloride, metformin, N-1-methylnicotinamide (NMN), tetraethylammonium (TEA), 1-methyl-4-phenylpyridinium (MPP), cimetidine, cisplatin and oxaliplatin. Cisplatin may develop a nephrotoxic action. Transport of creatinine is inhibited by fluoroquinolones such as DX-619 and LVFX. This transporter is a major determinant of the anticancer activity of oxaliplatin and may contribute to antitumor specificity.
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      Mechanism Description
  • Decreased clearance of Guanfacine due to the transporter inhibition by Bictegravir 

Recommended Action
      Management Caution is advised when bictegravir is used with drugs that are substrates of OCT2 or MATE1, particularly those with a narrow therapeutic range. Close monitoring is particularly recommended in patients with moderate renal impairment (CrCl 30 to 59 mL/min) who are to be administered bictegravir and metformin, due to the increased risk of lactic acidosis. Dosage adjustments as well as clinical and laboratory monitoring may be appropriate for some drugs whenever bictegravir is added to or withdrawn from therapy.

References
1 Cerner Multum, Inc. "Australian Product Information.".
2 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
3 Product Information. Biktarvy (bictegravir/emtricitabine/tenofovir). Gilead Sciences, Foster City, CA.