1. Anti-infection
  2. Reverse Transcriptase
  3. Efavirenz

Efavirenz (Synonyms: DMP 266; EFV; L-743726)

Cat. No.: HY-10572 Purity: 99.99%
Handling Instructions

Efavirenz is a potent inhibitor of the wild-type HIV-1 reverse transcriptase with a Ki of 2.93 nM and exhibits an IC95 of 1.5 nM for the inhibition of HIV-1 replicative spread in cell culture.

For research use only. We do not sell to patients.

Efavirenz Chemical Structure

Efavirenz Chemical Structure

CAS No. : 154598-52-4

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10 mM * 1 mL in DMSO USD 55 In-stock
Estimated Time of Arrival: December 31
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Customer Review

Based on 4 publication(s) in Google Scholar

Top Publications Citing Use of Products

    Efavirenz purchased from MCE. Usage Cited in: Cell Physiol Biochem. 2015;37(6):2496-507.

    Arithmetic means±SEM (n=19) of erythrocyte annexin-V-binding (black bars) following incubation for 48 hours to Ringer solution without (white bar) or with (black bars) presence of Efavirenz (1-4 µg/mL).
    • Biological Activity

    • Protocol

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    • Customer Review


    Efavirenz is a potent inhibitor of the wild-type HIV-1 reverse transcriptase with a Ki of 2.93 nM and exhibits an IC95 of 1.5 nM for the inhibition of HIV-1 replicative spread in cell culture.

    IC50 & Target

    Ki: 2.93 nM (HIV-1 RT)[1]

    In Vitro

    Efavirenz (L-743726) is found to be capable of inhibiting, with 95% inhibitory concentrations of ≤ 1.5μM, a panel of nonnucleoside reverse transcriptase (RT) inhibitors (NNRTIs)-resistant mutant viruses, each of which expresses a single RT amino acid substitution. Efavirenz is also tested for its activity against a variety of polymerase enzymes and is found to be inactive (IC50>300μM). Efavirenz effectively inhibits several wild-type T-lymphoid cell line-adapted variants. Identical activity (IC95, 1.5 to 3.0 nM) is seen with wild-type primary isolates of the virus in both primary lymphoid and monocytoid cell cultures. Efavirenz also effectively inhibits HIV-1 variants that expressed RT amino acid substitutions which confer the loss of susceptibility to other NNRTIs. For purposes of comparison[1]. Efavirenz is a non-nucleoside analog reverse transcriptase inhibitor (NNRTI) with IC50 of 60 nM[2]. Efavirenz inhibits synthesis using an RNA PPT-primed substrate with an IC50 of 17 nM[3].

    In Vivo

    After i.v. administration, Efavirenz (L-743726) is cleared rapidly from rats, but it is cleared considerably more slowly from monkeys. The large volume of distribution (two to four times the amount of body water) in both species indicates extensive tissue binding. The oral bioavailability in rats is 16%. In monkeys, the half-life of Efavirenz after administration of a 1 mg/kg i.v. dose exceeded 2.5 h. Efavirenz is well absorbed orally. Administration to monkeys of oral doses as fine suspensions in 0.5% aqueous methylcellulose yields consistently high levels in plasma. A 2.0 mg/kg dose produces peak levels of 0.5μM at approximately 3.0 h. The absolute bioavailability is estimated to be 42%. A 10 mg/kg dose yields a peak level in plasma of 3.22 μM. A 10 mg/kg oral dose given to a single chimpanzee gave concentrations in plasma of 4.12, 2.95, and 2.69 μM at 2, 8, and 24 h after dosing, respectively[1].

    Clinical Trial
    Molecular Weight




    CAS No.



    ClC1=CC=C(NC(O[[email protected]]2(C#CC3CC3)C(F)(F)F)=O)C2=C1


    Room temperature in continental US; may vary elsewhere.

    Powder -20°C 3 years
      4°C 2 years
    In solvent -80°C 6 months
      -20°C 1 month
    Solvent & Solubility
    In Vitro: 

    DMSO : ≥ 38 mg/mL (120.38 mM)

    *"≥" means soluble, but saturation unknown.

    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 3.1678 mL 15.8388 mL 31.6776 mL
    5 mM 0.6336 mL 3.1678 mL 6.3355 mL
    10 mM 0.3168 mL 1.5839 mL 3.1678 mL
    *Please refer to the solubility information to select the appropriate solvent.
    In Vivo:
    • 1.

      Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% saline

      Solubility: ≥ 2.5 mg/mL (7.92 mM); Clear solution

    • 2.

      Add each solvent one by one:  10% DMSO    90% corn oil

      Solubility: ≥ 2.5 mg/mL (7.92 mM); Clear solution

    *All of the co-solvents are provided by MCE.
    Kinase Assay

    Recombinant RT enzymes are expressed, purified, and assessed for inhibition by Efavirenz (L-743726). Ki and Kii values are determined for each enzyme tested. The wild-type RT exhibited exclusively noncompetitive inhibition kinetics (data not shown), and, therefore, the Ki and Kii values are identical. Pure noncompetitive inhibition is not assumed for the mutant enzymes, and, hence, the values of both Ki and Kii are obtained from the linear mixed-type inhibition equation. The two- to threefold differences between the Ki and Kii values probably reflect a small contribution of competitive inhibition with the mutant RTs[1].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Administration

    Studies are performed in rats, rhesus monkeys, and a single chimpanzee. For analyses of the drug given to rats intravenously (i.v.), a group (n=4 or 5) of fasted male Sprague-Dawley rats (weight, 250 to 450 g) receive a bolus (at a volume of 1mL/kg of body weight) of Efavirenz in DMSO via a cannula implanted in the right jugular vein. For oral studies, rats are dosed by gavage by using a suspension of Efavirenz prepared in 0.5% aqueous methylcellulose. Similarly, four monkeys receive either an i.v. bolus of the compound in DMSO via the saphenous vein at a volume of 0.1 mL/kg or are administered the compound orally in suspension by using a nasogastric tube. Monkeys are fasted for 18 h prior to dosing. One nonanesthetized, nonfasted male chimpanzee (weight, approximately 60 kg) is dosed orally by voluntary ingestion by using an aqueous suspension of the compound. In all studies, heparinized blood is obtained at appropriate times. Plasma is separated immediately by centrifugation and is stored at -20°C until analysis. Plasma samples are extracted with methylene chloride; this is followed by analysis by high-performance liquid chromatography.

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

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    EfavirenzDMP 266EFVL-743726DMP266DMP-266L743726L 743726Reverse TranscriptaseHIVAutophagyHuman immunodeficiency virusInhibitorinhibitorinhibit

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