Guidelines for the Use of Antiretroviral Agents in Pediatric HIV Infection

The information in the brief version is excerpted directly from the full-text guidelines. The brief version is a compilation of the tables and boxed recommendations.

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What to Start

What Not to Start: Regimens Not Recommended for Initial Therapy of Antiretroviral-Naive Children

Last Updated: September 12, 2019; Last Reviewed: September 12, 2019

Many antiretroviral (ARV) agents and combinations are available; some are not recommended for use as part of an initial regimen in ARV-naive children, although they may be used in ARV-experienced children. This section describes ARV drugs and drug combinations that are not recommended for use in ARV-naive children, or that lack sufficient data to recommend their use in ARV-naive children. Several ARV drugs that are no longer available or that have not been recommended for use in in children for several years, including the nucleoside reverse transcriptase inhibitors (NRTIs) stavudine and didanosine and the protease inhibitors (PIs) indinavir, nelfinavir, saquinavir, tipranavir, fosamprenavir, and enfuvirtide, have been removed from this chapter. Information about these agents is available in Archived Drugs.

Not Recommended

These include drugs and drug combinations that are not recommended for initial therapy in ARV-naive children because they produce an inferior virologic response, they pose potential serious safety concerns (including potentially overlapping toxicities), they are associated with pharmacologic antagonism, or there are better options within a drug class. These drugs and drug combinations are listed in Table 9.

Insufficient Data to Recommend

Drugs and drug combinations that are approved for use in adults but that have insufficient, limited, and/or no pharmacokinetic (PK) or safety data for children cannot be recommended for initial therapy in children. However, these drugs and drug combinations may be appropriate to consider when managing treatment-experienced children (see Management of Children Receiving Antiretroviral Therapy). These drugs are also listed in Table 9.

Antiretroviral Drugs and Combinations Not Recommended for Initial Therapy

Several ARV drugs, or certain dosing schedules for some ARV drugs, may be appropriate for use in some children but not others, depending on the child’s age and weight.

Atazanavir without Ritonavir Boosting

Although unboosted atazanavir is approved by the Food and Drug Administration (FDA) for use in treatment-naive adolescents aged ≥13 years and weighing ≥40 kg who are unable to tolerate ritonavir, data from the IMPAACT/PACTG 1020A study indicate that higher doses of unboosted atazanavir (as measured by mg/m2 of body surface area) are required in adolescents than in adults to achieve adequate drug concentrations.1 The Panel on Antiretroviral Therapy and Medical Management of Children Living with HIV (the Panel) does not recommend using atazanavir without ritonavir boosting because of these findings.

Regimens Containing Only Nucleoside Reverse Transcriptase Inhibitors

In adult trials, regimens that contain only NRTIs have shown less potent virologic activity than non-nucleoside reverse transcriptase inhibitor (NNRTI)-based or PI-based regimens.2,3 Data on the efficacy of triple-NRTI regimens for treatment of ARV-naive children are limited to small observational studies.4,5 In a study on the use of the triple-NRTI regimen abacavir plus lamivudine plus zidovudine in ARV-experienced children, this combination showed evidence of only modest viral suppression; only 10 of the 102 children had viral loads of <400 copies/mL at Week 48 of treatment.6 Therefore, regimens that contain only NRTIs are not recommended for treatment-naive or treatment-experienced children.

Regimens Containing Three Drug Classes

Data are insufficient to recommend initial regimens that contain agents from three drug classes (e.g., an NRTI plus an NNRTI plus a PI or an integrase strand transfer inhibitor [INSTI] plus an NRTI plus a PI or NNRTI). Although studies of regimens that contain three classes of drugs have demonstrated that these regimens are safe and effective in ARV-experienced children and adolescents, these regimens have not been studied as initial regimens in treatment-naive children and adolescents. These regimens also have the potential to induce resistance to three drug classes, which could severely limit future treatment options.7-11 Ongoing studies are investigating the use of drugs from three drug classes as treatment in neonates.

Regimens Containing Three Nucleoside Reverse Transcriptase Inhibitors and a Non-Nucleoside Reverse Transcriptase Inhibitor

Data are currently insufficient to recommend using a regimen that contains three NRTIs plus an NNRTI in young infants. A review of nine cohorts from 13 European countries suggested that this four-drug regimen produced responses that were superior to the responses observed in patients receiving boosted-PI regimens or three-drug NRTI regimens.12 There has been speculation that poor tolerance and poor adherence to a PI-based regimen may account for some of the differences. The ARROW trial, conducted in Uganda and Zimbabwe, randomized 1,206 children (with a median age of 6 years) to receive either a standard NNRTI-based, three-drug regimen or a four-drug regimen (three NRTIs and one NNRTI). After a 36-week induction period, the children on the four-drug regimen continued treatment on a dual-NRTI plus NNRTI regimen or a three-NRTI regimen. Although early improvements in CD4 T lymphocyte (CD4) cell counts and virologic control were observed among patients in the four-drug arm, these benefits were not sustained after patients switched to the three-NRTI regimen.13 Furthermore, after a median of 3.7 years on therapy, children in the four-drug arm who changed to an all-NRTI regimen had significantly poorer virologic control.14 Because three-drug regimens have been shown to be effective and well tolerated, and because efficacy data is lacking for the four-drug regimen, the Panel does not currently recommend the four-drug regimen.

Antiretroviral Drugs and Combinations with Insufficient Data to Recommend for Initial Therapy in Children

Several ARV drugs and drug regimens are not recommended for use as initial therapy in ARV-naive children or for specific age groups because of insufficient pediatric data. In some cases, new agents appear promising for use in adults but do not have sufficient pediatric PK and safety data to recommend their use as components of an initial therapeutic regimen in children. In addition, some dosing schedules may not be recommended in certain age groups due to insufficient data. As new data become available, these agents may become recommended agents or regimens. These agents and regimens are summarized below and are also listed in Table 9.

Doravirine-Based Regimens

Doravirine is an NNRTI that is available as both a single-drug tablet and a fixed-dose combination (FDC) tablet that contains doravirine 100 mg/lamivudine 300 mg/tenofovir disoproxil fumarate (TDF) 300 mg and is marketed as Delstrigo. Efficacy studies in adults have demonstrated that doravirine/lamivudine/TDF is noninferior to efavirenz-based regimens and darunavir-based regimens. Doravirine compared favorably to the other drugs in these trials in terms of adverse events. Currently, doravirine is not approved for use in children or adolescents aged <18 years, but there are ongoing studies of doravirine in children and adolescents. At this time, the Panel does not recommend the use of doravirine in children or adolescents.

Darunavir with Low-Dose Ritonavir-Based Regimens Administered Once Daily for Children Aged ≥3 Years to 12 Years

Data are limited on the PKs of once-daily darunavir/ritonavir (DRV/r) in young children. While modeling studies identified a once-daily dosing schedule for this combination that is now approved by the FDA, the Panel is concerned about the lack of efficacy data for individuals aged ≥3 years to <12 years treated with once-daily DRV/r. Therefore, once-daily dosing is not recommended for initial therapy in this age group. For children aged ≥3 years to <12 years, twice-daily DRV/r is a Preferred drug combination. For older children who have undetectable viral loads while receiving a twice-daily DRV/r-based regimen, practitioners can consider switching the DRV/r dosing to once-daily if no darunavir-associated resistance mutations are present. Once-daily dosing helps support adherence by making this drug combination easier to use.

Efavirenz-Based Regimens for Children Aged ≥3 Months to 3 Years

Efavirenz is approved by the FDA for use in children aged >3 months and weighing ≥3.5 kg. An efavirenz-based regimen has been shown to have variable PKs in studies of the very young; because of this, the Panel does not recommend using efavirenz in children aged <3 years at this time (see the efavirenz section in Appendix A: Pediatric Antiretroviral Drug Information). When use of efavirenz is being considered for children aged <3 years, cytochrome P450 (CYP) 2B6 genotyping should be performed, if available, in order to predict a patient’s metabolic rate for efavirenz. Therapeutic drug monitoring can also be considered.

Etravirine-Based Regimens

Etravirine is an NNRTI that has been studied in treatment-experienced children aged ≥1 years and is now approved by the FDA for use in children aged ≥2 years and weighing ≥10 kg.15-17 It is associated with multiple interactions with other ARV drugs, including tipranavir/ritonavir, atazanavir/ritonavir, and unboosted PIs, and must be administered twice daily. It is unlikely that etravirine will be studied in treatment-naive children.

Maraviroc-Based Regimens

Maraviroc is an entry inhibitor that is approved by the FDA for use in children aged ≥2 years and weighing ≥10 kg who have CCR5-tropic HIV-1. It has been used infrequently in children. A recent dose-finding study administered both the liquid and tablet formulations of maraviroc to treatment-experienced children aged 2 years to 18 years who were divided into four age cohorts.18 Initial dose was based on body surface area and scaled from recommended adult dose. Dose adjustments were required in patients who were not receiving a potent CYP3A4 inhibitor or inducer.19 Maraviroc has multiple drug interactions and must be administered twice daily. In addition, tropism assays must be performed prior to use to ensure the presence of only CCR5-tropic virus.

Antiretroviral Drug Regimens That Are Never Recommended

Several ARV drugs and drug regimens should never be used in children or adults. These are summarized in Table 10. Clinicians should also be aware of the components of FDC tablets so that patients do not inadvertently receive a double dose of a drug contained in such a combination.

Table 9. Antiretroviral Regimens or Components Not Recommended for Initial Treatment of HIV Infection in Children
Regimen or ARV Component Rationale
Unboosted ATV-containing regimens in children Reduced exposure
Once-daily DRV-based regimens in children aged ≥3 years to 12 years Insufficient data to recommend
Unboosted DRV Use without RTV has not been studied
Dual (full-dose) PI regimens Insufficient data to recommend

Potential for added toxicities
Dual-NRTI combination of ABC plus TDF Insufficient data to recommend
EFV-based regimens for children aged <3 years Appropriate dose not determined
ETR-based regimens Insufficient data to recommend
LPV/r dosed once daily Reduced drug exposure
MVC-based regimens Insufficient data to recommend
Regimens containing only NRTIs Inferior virologic efficacy
Regimens containing three drug classes Insufficient data to recommend
Full-dose RTV or use of RTV as the sole PI GI intolerance

Metabolic toxicity
Regimens containing three NRTIs and one NNRTI Added cost and complexity outweighs any benefit
TDF-containing regimens in children aged <2 years Potential bone toxicity

Appropriate dose has yet to be determined
Key to Acronyms: ABC = abacavir; ARV = antiretroviral; ATV = atazanavir; DRV = darunavir; EFV = efavirenz; ETR = etravirine; GI = gastrointestinal; LPV/r = lopinavir/ritonavir; MVC = maraviroc; NNRTI = non-nucleoside reverse transcriptase inhibitor; NRTI = nucleoside reverse transcriptase inhibitor; PI = protease inhibitor; RTV = ritonavir; TDF = tenofovir disoproxil fumarate

Table 10. Antiretroviral Therapy Regimens or Components Never Recommended for Treatment of HIV Infection in Children
ART Regimens Never Recommended for Children
Regimen Rationale Exceptions
One ARV Drug Alone (Monotherapy) Rapid development of resistance

Inferior antiviral activity compared to combinations that include ≥3 ARV drugs

Monotherapy “holding” regimens are associated with more rapid CD4 cell count declines than nonsuppressive ART.
Infants with perinatal HIV exposure and negative virologic tests who are receiving 4 weeks to 6 weeks of ZDV prophylaxis to prevent perinatal transmission of HIV
Two NRTIs Alone Rapid development of resistance

Inferior antiviral activity compared to combinations that include ≥3 ARV drugs
Not recommended for initial therapy

Some clinicians may opt to continue this treatment in patients who are currently on two NRTIs alone and who achieve virologic goals.
TDF plus ABC plus (3TC or FTC) as a Triple-NRTI Regimen High rate of early viral failure when this triple-NRTI regimen was used as initial therapy in treatment-naive adults No exceptions
TDF plus ddI plus (3TC or FTC) as a Triple-NRTI Regimen High rate of early viral failure when this triple-NRTI regimen was used as initial therapy in treatment-naive adults No exceptions
ARV Components Never Recommended as Part of an ARV Regimen for Children
Regimen Rationale Exceptions
Dual-NNRTI Combinations Enhanced toxicity No exceptions
Dual-NRTI Combination 3TC plus FTC Similar resistance profile and no additive benefit No exceptions
Dual-NRTI Combination d4T plus ZDV Antagonistic effect on HIV No exceptions
NVP as Initial Therapy in Adolescent Girls with CD4 Counts >250 cells/mm3 or Adolescent Boys with CD4 Counts >400 cells/mm3 Increased incidence of symptomatic (including serious and potentially fatal) hepatic events in these patient groups Only if benefit clearly outweighs risk
Key to Acronyms: 3TC = lamivudine; ABC = abacavir; ART = antiretroviral therapy; ARV = antiretroviral; CD4 = CD4 T lymphocyte; d4T = stavudine; ddI = didanosine; DRV = darunavir; FTC = emtricitabine; NNRTI = non-nucleoside reverse transcriptase inhibitor; NRTI = nucleoside reverse transcriptase inhibitor; NVP = nevirapine; TDF = tenofovir disoproxil fumarate; ZDV = zidovudine

References

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