Unlocking The Secrets of Efavirenz:
A Comprehensive Drug Information Resource
Kumudini Pawar, Aakanksha Kumbhar, Prerana Gherade*, Sandhyarani Sonkamble
Department of Quality Assurance, Abhinav Education Society’s College of Pharmacy,
(B. Pharm) Narhe, Pune 411041, Maharashtra, India.
*Corresponding Author E-mail: gheradebp099@gmail.com
ABSTRACT:
Efavirenz is an antiretroviral medicine generally used to treat HIV infection. As a non-nucleoside reverse transcriptase inhibitor (NNRTI), it inhibits the replication of the contagion. Efavirenz is well absorbed when taken orally, reaching peak tube attention within 3-5 hours. Its long elimination half-life of 52-76 hours allows for formerly diurnal dosing and improves patient compliance. Efavirenz is primarily metabolized in the liver by cytochrome P450 enzymes, particularly CYP2B6 and CYP3A4, and undergoes expansive hepatic metabolism to form inactive metabolites. The medicine is substantially excreted in the feces, with a small quantum excreted in the urine. Efavirenz may interact with other medicines and substances due to its influence on the exertion of CYP3A4 and its metabolism through CYP2B6. Medicine-medicine relations should be precisely considered to avoid compromising the efficacity and safety of co-administered medicines. There are certain contraindications to the use of Efavirenz. People with known acuity to the medicine or its factors shouldn’t take Efavirenz. Efavirenz isn’t recommended for pregnant women due to the increased threat of fetal neural tube blights. Effective contraception is essential for women of travail eventually taking Efavirenz. In conclusion, Efavirenz is a precious formerly-diurnal dosing antiretroviral medicine that supports patient compliance.
KEYWORDS: Synthesis, Mechanism of Action, Physiochemical Properties, Pharmacokinetics Properties, Medicinal Uses.
INTRODUCTION:
Efavirenz1,2 is an inhibitor of reverse transcriptase that is not nucleoside (NNRTI). Following FDA and EMEA approval in 1998 and 1999, respectively, Efavirenz was rapidly adopted as a key stay of highly active antiretroviral therapy (HAART) in industrialized nations for the treatment of HIV-1 infections. There are currently three NNRTIs on the market: Efavirenz, nevirapine, and delavirdine in the US.
The majority of the existing data supports Efavirenz over delavirdine and nevirapine3. Nevirapine may not be as beneficial for certain patients as it is for others due to potentially fatal side effects such as severe hepatotoxicity or rash/Stevens-Johnson syndrome (e.g., patients with higher CD4 cell counts; women > 250; and males > 400 CD4 cells/µl). Because Efavirenz is teratogenic, it should not be used in women who are pregnant or who are highly likely to become pregnant3. For this reason, the majority of African women who are capable of carrying children are prescribed nevirapine rather than Efavirenz. Because it is less expensive, nevirapine is also utilized in Africa. Compared to Efavirenz, it has a little better impact on the blood lipid profile. This may support the use of nevirapine in individuals who already have coronary heart disease risk factors4. The low genetic barrier that prevents drug-resistant virus variations from developing is one of the main drawbacks of the current generation of NNRTIs. A substantial degree of drug resistance may result from specific single amino acid mutations in the NNRTI-binding region (K103N, V106M, G190S/A/E, Y181C, Y188L, M230L)5. There is a great deal of cross-resistance within the licensed NNRTIs. Novel medications in this class are being developed to combat cross-resistance within classes6. The low genetic barrier to resistance may be a general drawback, but it also provides compelling evidence for starting with nucleoside reverse transcriptase inhibitors (NRTIs) when the NRTI backbone is strongest. As one of the recommended first-line antiretroviral regimens, current treatment guidelines for individuals with HIV-1 infection advise using Efavirenz in conjunction with zidovudine or tenofovir disoproxil fumarate, along with lamivudine or emtricitabine7,8. A general limitation of the low genetic barrier to resistance may be that it supports the idea of commencing with nucleoside reverse transcriptase inhibitors (NRTIs) when the NRTI backbone is strongest. According to current treatment guidelines for HIV-1 infection, Efavirenz should be used in combination with zidovudine or tenofovir disoproxil fumarate, lamivudine, or emtricitabine as one of the recommended first-line antiretroviral regimens9.
STRUCTURE AND MECHANISM OF ACTION:
Efavirenz is chemically designated (S)-6-chloro-4-(cyclopropyl ethynyl)-1,4-dihydro-4-(trifluoromethyl)-2H-3,1-benzoxazin-2-individual. Its chemical structure is C14H9CIF3NO2. Efavirenz has a microscopic volume of 315.68 and is almost secretive in water (< 10µg/ml). The structure of Efavirenz is shown in Figure 1. All approved NNRTIs primarily interfere with HIV-1 reverse transcriptase function and have some inhibitory effect on HIV-2 reverse transcriptase and human basic DNA polymerases -α, -β, -γ, and -δ. When they occupy a specific hydrophobic pocket in HIV-1 reverse transcriptase, NNRTIs restrict the process of RNA-dependent DNA polymerization10.
The antiviral activity of Efavirenz is dependent on intracellular conversion to the active triphosphorylated form. The rate of Efavirenz phosphorylation varies, depending on cell type. It is believed that inhibition of reverse transcriptase interferes with the generation of DNA copies of viral RNA, which, in turn, are necessary for the synthesis of new virions. Intracellular enzymes subsequently eliminate the HIV particle that previously had been uncoated, and left unprotected, during entry into the host cell. Thus, reverse transcriptase inhibitors are virstatin and do not eliminate HIV from the body. Even though human DNA polymerase is less susceptible to the pharmacologic effects of triphosphorylated Efavirenz, this action may nevertheless account for some of the drug's toxicity10.
PHYSICOCHEMICAL PROPERTIES:
Solubility:
Efavirenz is reported to be practically insoluble in water. A water solubility of less than 10g/mL was reported, but the temperature at which the tests were performed was not reported. Rabel et al.10. reported an intrinsic solubility of 8.3g/mL by calculating the solubility of Efavirenz in the pH range of 18. The solubility tests were performed at different pH values by adding hydrochloric acid or sodium hydroxide solution to deionized water.18 Gao et al.19 reported on the solubility of Efavirenz in biorelevant media, which was higher than in aqueous buffer. Since no solubility data compliant with the Biopharmaceutics Classification System (BCS) are available in the literature, additional solubility studies were performed on the API in accordance with WHO guidelines11.
Stereochemistry and polymorphism:
Efavirenz possesses a chiral carbon atom at position 4. The 4S enantiomer is used in commercially available formulations. A 3mg/mL solution in methanol shows a specific optical rotation of 89100 at 20°C.9 No polymorphs of Efavirenz have been reported in the open literature12.
pKa:
A pKa for Efavirenz was reported to be 10.1±0.113.
Partition coefficient (log P):
A log P value of 2.07±0.12 was determined using the octanol-water shake flask method, 20 although the temperature at which this value was obtained was not reported. Rowe et al. Reported a higher log P value of 5.4, but no information was given on the experimental conditions13.
Available dosage form strengths:
Efavirenz is available as a single agent and as a fixed-dose combination product in the form of capsules, tablets, and oral solutions. IR dosage forms containing a single API are available in 50, 100, 200, and 600mg dosage strengths. The highest recommended dose strength of Efavirenz in the 17th edition of the WHO Model List of Essential Medicine is 600mg tablets and 200mg capsules13.
PHARMACOKINETIC PROPERTIES:
There are three different forms of Efavirenz available: 50, 100, or 200mg capsules for oral treatment; 600mg film-coated tablets; and 30mg/ml liquid formulation. In the US, Efavirenz, tenofovir, and emtricitabine, the whole HAART combination, is already accessible as a single pill. To reduce potential neuropsychiatric adverse effects, the suggested Efavirenz dosage is 600mg once a day, given orally, on an empty stomach, and preferably right before bed. Efavirenz can harm the foetus during the first trimester of pregnancy, which is why it is prohibited in pregnancy (category D). There have been reports of neural tube abnormalities in babies delivered to mothers who took Efavirenz during the first trimester. Pregnancy testing is recommended, and women of reproductive potential should get birth control counsellingbefore beginning Efavirenz.Efavirenz has a good oral bioavailability. Five hours after a single oral dose of 100–1600mg given to healthy volunteers, peak Efavirenz plasma concentrations of 1.6–9.1µM are reached. Peak plasma concentrations occur in approximately 3 to 5 hours, and steady-state plasma concentrations are attained in 6 to 10 days. The steady-state Cmax was 12.9±3.7µM (mean±SD), the steady-state Cmin was 5.6±3.2µM, and the AUC was 184±73 µM/h in individuals receiving 600mg of Efavirenz. When food is consumed together with Efavirenz administration, the Cmax and AUC of Efavirenz are higher than when fasting circumstances are met. Efavirenz passes the blood–brain barrier easily; its concentrations in the cerebrospinal fluid range from 0.26 to 1.19% of those in blood plasma. There are contradicting reports about Efavirenz's penetration of the male genital canal. The median Efavirenz level in semen was only 3.4% (range 2.0 – 5.0%) of that in blood plasma, according to Reddy et al14. Allsemen Efavirenz concentrations, however, were still more than forty times greater than the IC90 for HIV-1 wild-type. These findings suggest that Efavirenz can effectively inhibit HIV-1 in the male genital tract when it reaches high enough concentrations. However, despite excellent quantities in blood plasma, Ghosn et al15.reported three patients on an Efavirenz-containing regimen having undetectable Efavirenz concentrations in semen. To make a firm determination regarding Efavirenz's penetration into the vaginal tract, more information is required. 99.5–99.75 percent of Efavirenz is linked to human plasma proteins, mostly albumin. The CYP450 system primarily breaks down Efavirenz into hydroxylated metabolites, which are then glucuronidated. The two most significant isoenzymes are CYP2B6 and CYP3A4. Efavirenz's metabolism is an enzymatic process that can be induced by itself16.
The terminal half-lives of Efavirenz are 40–55hours after repeated doses and 52–76hours after a single dose. Patients with renal impairment do not require a dosage change because less than 1% of Efavirenz is eliminated in the urine. In the initial months following Efavirenz treatment, liver enzyme levels in patients with hepatic impairment or co-infection with hepatitis B (HBV)/hepatitis C virus (HCV) should be closely monitored17.
METHODS OF SYNTHESIS:
The original synthesis of EFV in 1998 was a seven- step process that resulted in 62% overall yield as seen in given fig. the biggest challenge in EFV’s synthesis was to create the quaternary carbon center in the fourth step.23 the fifth step includes the addition of cyclopropyl acetylene (CA) side chain18.
MEDICINAL USES:
For previously untreated HIV infection, the US Department of Health and Human Services Antiretroviral Guidance Panel recommends the use of Efavirenz in combination with tenofovir/emtricitabine (Truvada) as one of the preferred NNRTI-based treatment regimens in adults, adolescents, and children. Efavirenz is also used in combination with other antiretroviral medications as part of extended post-exposure prophylaxis to reduce the risk of HIV infection in individuals who are at significant risk (e.g., needlestick injuries, certain types of unprotected sex, etc.). Efavirenz can be used safely during the first trimester of pregnancy19.
There is a lot of research supporting the use of Efavirenz to treat cancer. Efavirenz slows the growth of several cancers in cultures, including colon cancer, pancreatic cancer, lung cancer, glioblastoma, and leukaemia. Interestingly, this drug has been shown to enhance the effects of radiation therapy and is also successful as a stand-alone treatment. Several clinical trials have been conducted to evaluate the efficacy of Efavirenz, either alone or in combination with other therapies; see Table 119.
In addition to cancer treatment, Efavirenz can also be used in neurological conditions or other viral contagious conditions. For illustration, as a cholesterol-lowering medicine against Alzheimer’s complaint. Because the central nervous system enzyme cytochrome P450 46A1 (CYP46A1) can be actuated in small boluses by the rear transcriptase asset, this may help the brain metabolize rising cholesterol situations during Alzheimer's complaints. Plus, for implicit treatment of Zika contagion (ZIKV), the authors used Vero cells to test the capability of Efavirenz and other composites to inhibit ZIKV at 2 hours post-infection19.
CONVENTIONAL MARKETED FORMULATION:
Efavirenz is commonly available in tablet and capsule dosage forms. Some marketed formulation of Efavirenz is listed in Table 2.
|
Disease |
Target |
Single or combination treatment |
Reference |
|
Alzheimer |
CYP46A1 |
Single |
[20] |
|
Colorectal cancer |
In vitro approach |
Combination |
[21] |
|
Pancreatic Cancer |
Activating phosphorylation of the tumour suppressor protein p53 |
As a single treatment or in combination with radiotherapy |
[22] |
|
Prostate cancer |
Prostate-specific antigen (PSA) non-progression rate |
Single |
[23] |
|
Lung cancer |
In vitro approach (MRC-5 and A549 ling cells) |
Single |
[24] |
|
Glioblastoma |
CYP46A1/ 24OHC axis, a potential therapeutic target |
Single |
[25] |
|
Leukaemia |
Induce apoptosis |
Single |
[26] |
|
Prion disease |
Cellular prion protein (PrPc) |
Single |
[27] |
|
Zika virus |
Non-structural protein genes |
In combination with rilpivirine and etravirine |
[28] |
|
Dravet syndrome |
5-HT on- or off- target |
single |
[29] |
Table 2: Some marketed formulations of Efavirenz.
|
Formulation type |
Brand name |
Company name |
Dose |
Reference |
|
Tablet |
Sustiva |
Bristol Myers Squibb Co. |
50mg, 100mg, 200mg |
[30] |
|
Tablet |
Stocrin |
Merck Sharp and Dohme Corp. |
50mg, 100mg, 200mg |
[31] |
|
Capsule |
Efavir |
Cipla Limited |
200mg |
[32] |
|
Capsule |
Efavir |
Cipla Limited |
200mg |
[32] |
|
Tablet |
Efavir |
Cipla Limited |
600mg |
[32] |
|
Film Coated tablet |
Efavir |
Cipla Limited |
600mg |
[32] |
|
Tablet |
Efcure |
Emcure Pharmaceuticals Lim. |
- |
[32] |
|
Syrup |
EfcureSoln |
Emcure Pharmaceuticals Lim. |
- |
[32] |
|
Capsule |
Estiva |
Genix Pharma Lim. |
- |
[32] |
|
Tablet |
Revenz |
Sain Medicaments Pvt Lim. |
- |
[32] |
Table 3: Patent List of EfavirenzDrug.
|
Patent Number |
Approved |
Expiries |
|
US5811423 |
1998-09-22 |
2012-08-07 |
|
CA2279198 |
2009-04-14 |
2018-02-02 |
|
CA2101572 |
2001-08-28 |
2013-07-29 |
|
US5914331 |
1999-06-22 |
2018-01-02 |
|
US6043230 |
2000-03-28 |
2018-01-25 |
|
US5814639 |
1998-09-29 |
2017-03-29 |
|
US6555133 |
2003-04-29 |
2019-10-06 |
|
US6939964 |
2005-09-06 |
2018-07-20 |
|
US6639071 |
2003-10-28 |
2018-08-14 |
|
US6238695 |
2001-05-29 |
2019-10-06 |
PATENT:
In most countries, the compound patent for Efavirenz expired in or around August 2013. There are some instances where it is anticipated to end later due to patent term extensions (for example, for instance, the expiration date in Ukraine is 2018). The compound patent was in effect in Argentina, China, Dominican Republic, Indonesia, Mexico, Pakistan (method patent only), South Africa, Thailand, and Ukraine but is likely to have expired in the majority of these nations, according to the information that is now accessible. Several South African businesses have been granted permits to produce and export Efavirenz to ten of its neighbors. Brazil, Indonesia, and Thailand have all awarded Efavirenz mandatory licenses33. Some patents and their approved year are mentioned in Table3.
CONCLUSION:
Efavirenz is a popular antiretroviral medication for the treatment of HIV, to sum up. Due to its favorable pharmacokinetic profile, a once-daily dose can improve patient compliance. However, before prescribing Efavirenz, a patient's medical history and current drugs must be considered due to possible drug interactions and contraindications. To maintain the best efficacy and safety in HIV-infected patients, regular monitoring of medication levels and clinical response is required.
CONFLICT OF INTEREST:
The authors have no conflicts of interest regarding this investigation.
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Received on 27.01.2024 Modified on 12.03.2024
Accepted on 05.04.2024 ©AandV Publications All right reserved
Res. J. Pharmacology and Pharmacodynamics.2024;16(3):175-180.
DOI: 10.52711/2321-5836.2024.00030