Recommendations for the Use of Antiretroviral Drugs During Pregnancy and Interventions to Reduce Perinatal HIV Transmission in the United States

Recommendations for Use of Antiretroviral Drugs During Pregnancy

Pregnant People With HIV Who Have Previously Received Antiretroviral Medications but Are Not Currently on Antiretroviral Medications

Pregnant people with HIV who are currently not receiving antiretroviral therapy (ART) may have received antiretroviral (ARV) medications in the past, either as treatment (ART) or prevention of HIV transmission to their infant (i.e., perinatal prevention) or pre-exposure prophylaxis (PrEP) .^1,2 There has been concern that prior, time-limited use of ART during pregnancy to prevent perinatal transmission may lead to resistance and, thus, reduced efficacy if these ARV drugs are used as a part of subsequent ART regimens.^3-7 Standard genotyping has shown that the rates of resistance after time-limited use of ART appear to be low. Resistance seems to be a concern primarily in patients who received time-limited non-nucleoside reverse transcriptase inhibitor (NNRTI)–based therapy,^8-10 but not in those who previously received protease inhibitor (PI)–based therapies.⁸ However, recent studies suggest that individuals receiving long-acting cabotegravir who acquire HIV infection are at high risk for selection of integrase inhibitor mutations, see Early (Acute and Recent) HIV Infection in the Adult and Adolescent Antiretroviral Guidelines.

Individuals may choose to discontinue ART for a variety of reasons, and the length of time off treatment before pregnancy may vary. A person’s HIV treatment history and all prior drug resistance test results should be considered when choosing ART regimens for pregnant people who previously have received treatment, even when the results of drug-resistance testing performed during the current pregnancy are not yet available.

Interpretation of resistance testing can be complex because resistance testing is most accurate when performed while an individual is still taking ART or within 4 weeks of discontinuing treatment. In the absence of selective drug pressure, resistant virus may revert to wild type; thus, a negative finding does not rule out the presence of archived resistant virus that could re-emerge once ART is restarted. Therefore, when selecting a new ART regimen, all information—including regimens received, viral response, laboratory testing (including HLA-B*5701 screening results), tolerance or adherence problems, food requirements, concomitant medications, prior medical conditions, and results of all prior resistance testing—should be considered.

Resistance testing should be performed before initiating a new ART regimen in people who have previously received ARVs (see Antiretroviral Drug Resistance and Resistance Testing in Pregnancy). In general, ART should be initiated before receiving the results of ARV drug-resistance testing, especially because longer durations of ART during pregnancy have been associated with reduced perinatal transmission rates, compared with shorter treatment periods.^11,12 ART should be modified, when necessary, based on subsequent resistance assay results. Careful monitoring of virologic response is essential. (For specific guidance on timing and frequency, see Initial Evaluation and Continued Monitoring of HIV-Related Assessments During Pregnancy).

A person may restart a previous ART regimen that successfully suppressed their viral load if the regimen was tolerated well and no evidence of resistance to that regimen is identified. Ideally, the regimen should also be recommended currently as a Preferred or Alternative regimen for initial ART in pregnancy (see Table 6. What to Start: Initial Antiretroviral Regimens During Pregnancy for People Who Are Antiretroviral Naive and Table 7. Situation-Specific Recommendations for Use of Antiretroviral Drugs in Pregnant People and Nonpregnant People Who Are Trying to Conceive). Drugs that are not recommended for initial use because of concerns about viral breakthrough during pregnancy should be avoided if good options exist; if not, they should be discussed with the patient using a shared decision-making approach. Even experienced health care providers may have difficulty with the selection of appropriate ART for people who have advanced HIV disease, a history of extensive prior ART, or previous significant toxicity or nonadherence. In addition to obtaining genotypic resistance testing, it is strongly recommended that specialists in the treatment of HIV be consulted early in the pregnancy about the choice of a suitable ART regimen for such individuals.

If ART produces an insufficient viral response (e.g., <1 log₁₀ drop within 4 weeks), clinicians should repeat resistance testing—including testing for resistance to integrase strand transfer inhibitors (INSTIs) if indicated (see Antiretroviral Drug Resistance and Resistance Testing in Pregnancy)—and assess medication adherence; food requirements; and potential drug interactions, including relevant pharmacokinetic studies when available, to inform potential regimen changes. Consultation with an HIV treatment specialist is recommended (see Pregnant People Who Have Not Achieved Viral Suppression on Antiretroviral Therapy).

References

1. Cohen MS, Chen YQ, McCauley M, et al. Prevention of HIV-1 infection with early antiretroviral therapy. N Engl J Med. 2011;365(6):493-505. Available at: http://www.ncbi.nlm.nih.gov/pubmed/21767103.
2. Centers for Disease Control and Update to CDC’s U.S. Medical Eligibility Criteria for Contraceptive Use, 2010: revised recommendations for the use of hormonal contraception among women at high risk for HIV infection or infected with HIV. MMWR Morb Mortal Wkly Rep. 2012;61(24):449-452. Available at: http://www.ncbi.nlm.nih.gov/pubmed/22717514.
3. Vogler MA, Smeaton LM, Wright RL, et al. Combination antiretroviral treatment for women previously treated only in pregnancy: week 24 results of AIDS Clinical Trials Group protocol a5227. J Acquir Immune Defic Syndr. 2014;65(5):542-550. Available at: http://www.ncbi.nlm.nih.gov/pubmed/24759064.
4. Aziz N, Sokoloff A, Kornak J, et al. Time to viral load suppression in antiretroviral-naive and -‍experienced HIV-infected pregnant women on highly active antiretroviral therapy: implications for pregnant women presenting late in gestation. BJOG. 2013;120(12):1534-1547. Available at: http://www.ncbi.nlm.nih.gov/pubmed/23924192.
5. Huntington S, Thorne C, Anderson J, et al. Response to antiretroviral therapy (ART): comparing women with previous use of zidovudine monotherapy (ZDVm) in pregnancy with ART naive women. BMC Infect Dis. 2014;14:127. Available at: http://www.ncbi.nlm.nih.gov/pubmed/24593018.
6. Geretti AM, Fox Z, Johnson JA, et al. Sensitive assessment of the virologic outcomes of stopping and restarting non-nucleoside reverse transcriptase inhibitor-based antiretroviral therapy. PLoS One. 2013;8(7):e69266. Available at: http://www.ncbi.nlm.nih.gov/pubmed/23874928.
7. Martin IB, Read S, Harrigan R, Gomez MP. Treatment experience and repeat pregnancy impact the effectiveness of non-nucleoside reverse transcription inhibitor-highly active antiretroviral therapy for the prevention of mother to child transmission of human immunodeficiency vAIDS Res Hum Retroviruses. 2020;36(8):681-687. Available at: https://www.ncbi.nlm.nih.gov/pubmed/32408754.
8. French CE, Tookey PA, Cortina-Borja M, de Ruiter A, Townsend CL, Thorne C. Influence of short-course antenatal antiretroviral therapy on viral load and mother-to-child transmission in subsequent pregnancies among HIV-infected women. Antivir Ther. 2013;18(2):183-192. Available at: http://www.ncbi.nlm.nih.gov/pubmed/23475123.
9. Perez H, Vignoles M, Laufer N, et al. Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen. Antivir Ther. 2008;13(1):135-139. Available at: http://www.ncbi.nlm.nih.gov/pubmed/18389908.
10. Lehman DA, Chung MH, Mabuka JM, et al. Lower risk of resistance after short-course HAART compared with zidovudine/single-dose nevirapine used for prevention of HIV-1 mother-to-child transmission. J Acquir Immune Defic Syndr. 2009;51(5):522-529. Available at: http://www.ncbi.nlm.nih.gov/pubmed/19502990.
11. Townsend CL, Byrne L, Cortina-Borja M, et al. Earlier initiation of ART and further decline in mother-to-child HIV transmission rates, 2000–AIDS. 2014;28(7):1049-1057. Available at: http://www.ncbi.nlm.nih.gov/pubmed/24566097.
12. Sibiude J, Le Chenadec J, Mandelbrot L, et al. Update of perinatal HIV-1 transmission in France: zero transmission for 5,482 mothers on continuous ART from conception and with undetectable viral load at delivery. Clin Infect Dis. 2022. Available at: https://www.ncbi.nlm.nih.gov/pubmed/36037040.