Details of Drug-Drug Interaction
| Drug General Information (ID: DDIIFL13EM) | |||||||||
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| Drug Name | Lamotrigine | Drug Info | Atazanavir | Drug Info | |||||
| Drug Type | Small molecule | Small molecule | |||||||
| Therapeutic Class | Anticonvulsants | Anti-Hiv Agents | |||||||
| Structure | |||||||||
| Mechanism of Lamotrigine-Atazanavir Interaction (Severity Level: Moderate) | |||||||||
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| UGT inhibition Click to Show/Hide Mechanism Graph | |||||||||
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| Drug Name | Lamotrigine | Atazanavir | |||||||
| Mechanism | UGT1A1 substrate | UGT1A1 inhibitor | |||||||
| Key Mechanism Factor 1 | |||||||||
| Factor Name | UDP-glucuronosyltransferase 1A1 |
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Structure
Sequence
MAVESQGGRPLVLGLLLCVLGPVVSHAGKILLIPVDGSHWLSMLGAIQQLQQRGHEIVVLAPDASLYIRDGAFYTLKTYPVPFQREDVKESFVSLGHNVFENDSFLQRVIKTYKKIKKDSAMLLSGCSHLLHNKELMASLAESSFDVMLTDPFLPCSPIVAQYLSLPTVFFLHALPCSLEFEATQCPNPFSYVPRPLSSHSDHMTFLQRVKNMLIAFSQNFLCDVVYSPYATLASEFLQREVTVQDLLSSASVWLFRSDFVKDYPRPIMPNMVFVGGINCLHQNPLSQEFEAYINASGEHGIVVFSLGSMVSEIPEKKAMAIADALGKIPQTVLWRYTGTRPSNLANNTILVKWLPQNDLLGHPMTRAFITHAGSHGVYESICNGVPMVMMPLFGDQMDNAKRMETKGAGVTLNVLEMTSEDLENALKAVINDKSYKENIMRLSSLHKDRPVEPLDLAVFWVEFVMRHKGAPHLRPAAHDLTWYQYHSLDVIGFLLAVVLTVAFITFKCCAYGYRKCLGKKGRVKKAHKSKTH
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| Gene Name | UGT1A1 | ||||||||
| Uniprot ID | UD11_HUMAN | ||||||||
| KEGG Pathway | hsa:54658 | ||||||||
| Protein Family | UDP-glycosyltransferase family | ||||||||
| Protein Function |
[Isoform 1]: UDP-glucuronosyltransferase (UGT) that catalyzes phase II biotransformation reactions in which lipophilic substrates are conjugated with glucuronic acid to increase the metabolite's water solubility, thereby facilitating excretion into either the urine or bile (PubMed:12181437, PubMed:15472229, PubMed:18004206, PubMed:18004212, PubMed:18719240, PubMed:19830808, PubMed:23288867). Essential for the elimination and detoxification of drugs, xenobiotics and endogenous compounds (PubMed:12181437, PubMed:18004206, PubMed:18004212). Catalyzes the glucuronidation of endogenous estrogen hormones such as estradiol, estrone and estriol (PubMed:15472229, PubMed:18719240, PubMed:23288867). Involved in the glucuronidation of bilirubin, a degradation product occurring in the normal catabolic pathway that breaks down heme in vertebrates (PubMed:17187418, PubMed:18004206, PubMed:19830808). Also catalyzes the glucuronidation the isoflavones genistein, daidzein, glycitein, formononetin, biochanin A and prunetin, which are phytoestrogens with anticancer and cardiovascular properties (PubMed:18052087, PubMed:19545173). Involved in the glucuronidation of the AGTR1 angiotensin receptor antagonist losartan, a drug which can inhibit the effect of angiotensin II (PubMed:18674515). Involved in the biotransformation of 7-ethyl-10-hydroxycamptothecin (SN-38), the pharmacologically active metabolite of the anticancer drug irinotecan (PubMed:12181437, PubMed:18004212, PubMed:20610558).
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| Mechanism Description |
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| Recommended Action | |||||||||
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| Management | No dose adjustments are required when lamotrigine is added to an existing regimen of atazanavir-ritonavir. However, if the regimen includes a maintenance dose of lamotrigine and no other glucuronidation inducers, a dosage increase may be required when atazanavir-ritonavir is added to the regimen, based on clinical response and plasma levels. A dosage decrease may be required upon discontinuation of atazanavir-ritonavir. Monitoring of plasma lamotrigine levels is recommended before and after atazanavir-ritonavir is initiated or discontinued. The manufacturer's labeling should be consulted for the appropriate dosage regimen. | ||||||||