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Meta-Analysis
. 2018 Nov 14;11(11):CD011444.
doi: 10.1002/14651858.CD011444.pub3.

Mefloquine for preventing malaria in pregnant women

Affiliations
Meta-Analysis

Mefloquine for preventing malaria in pregnant women

Raquel González et al. Cochrane Database Syst Rev. .

Abstract

Background: The World Health Organization recommends intermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine for malaria for all women who live in moderate to high malaria transmission areas in Africa. However, parasite resistance to sulfadoxine-pyrimethamine has been increasing steadily in some areas of the region. Moreover, HIV-infected women on cotrimoxazole prophylaxis cannot receive sulfadoxine-pyrimethamine because of potential drug interactions. Thus, there is an urgent need to identify alternative drugs for prevention of malaria in pregnancy. One such candidate is mefloquine.

Objectives: To assess the effects of mefloquine for preventing malaria in pregnant women, specifically, to evaluate:• the efficacy, safety, and tolerability of mefloquine for preventing malaria in pregnant women; and• the impact of HIV status, gravidity, and use of insecticide-treated nets on the effects of mefloquine.

Search methods: We searched the Cochrane Infectious Diseases Group Specialized Register, the Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library, MEDLINE, Embase, Latin American Caribbean Health Sciences Literature (LILACS), the Malaria in Pregnancy Library, and two trial registers up to 31 January 2018. In addition, we checked references and contacted study authors to identify additional studies, unpublished data, confidential reports, and raw data from published trials.

Selection criteria: Randomized and quasi-randomized controlled trials comparing mefloquine IPT or mefloquine prophylaxis against placebo, no treatment, or an alternative drug regimen.

Data collection and analysis: Two review authors independently screened all records identified by the search strategy, applied inclusion criteria, assessed risk of bias, and extracted data. We contacted trial authors to ask for additional information when required. Dichotomous outcomes were compared using risk ratios (RRs), count outcomes as incidence rate ratios (IRRs), and continuous outcomes using mean differences (MDs). We have presented all measures of effect with 95% confidence intervals (CIs). We assessed the certainty of evidence using the GRADE approach for the following main outcomes of analysis: maternal peripheral parasitaemia at delivery, clinical malaria episodes during pregnancy, placental malaria, maternal anaemia at delivery, low birth weight, spontaneous abortions and stillbirths, dizziness, and vomiting.

Main results: Six trials conducted between 1987 and 2013 from Thailand (1), Benin (3), Gabon (1), Tanzania (1), Mozambique (2), and Kenya (1) that included 8192 pregnant women met our inclusion criteria.Two trials (with 6350 HIV-uninfected pregnant women) compared two IPTp doses of mefloquine with two IPTp doses of sulfadoxine-pyrimethamine. Two other trials involving 1363 HIV-infected women compared three IPTp doses of mefloquine plus cotrimoxazole with cotrimoxazole. One trial in 140 HIV-infected women compared three doses of IPTp-mefloquine with cotrimoxazole. Finally, one trial enrolling 339 of unknown HIV status compared mefloquine prophylaxis with placebo.Study participants included women of all gravidities and of all ages (four trials) or > 18 years (two trials). Gestational age at recruitment was > 20 weeks (one trial), between 16 and 28 weeks (three trials), or ≤ 28 weeks (two trials). Two of the six trials blinded participants and personnel, and only one had low risk of detection bias for safety outcomes.When compared with sulfadoxine-pyrimethamine, IPTp-mefloquine results in a 35% reduction in maternal peripheral parasitaemia at delivery (RR 0.65, 95% CI 0.48 to 0.86; 5455 participants, 2 studies; high-certainty evidence) but may have little or no effect on placental malaria infections (RR 1.04, 95% CI 0.58 to 1.86; 4668 participants, 2 studies; low-certainty evidence). Mefloquine results in little or no difference in the incidence of clinical malaria episodes during pregnancy (incidence rate ratio (IRR) 0.83, 95% CI 0.65 to 1.05, 2 studies; high-certainty evidence). Mefloquine decreased maternal anaemia at delivery (RR 0.84, 95% CI 0.76 to 0.94; 5469 participants, 2 studies; moderate-certainty evidence). Data show little or no difference in the proportions of low birth weight infants (RR 0.95, 95% CI 0.78 to 1.17; 5641 participants, 2 studies; high-certainty evidence) and in stillbirth and spontaneous abortion rates (RR 1.20, 95% CI 0.91 to 1.58; 6219 participants, 2 studies; I2 statistic = 0%; moderate-certainty evidence). IPTp-mefloquine increased drug-related vomiting (RR 4.76, 95% CI 4.13 to 5.49; 6272 participants, 2 studies; high-certainty evidence) and dizziness (RR 4.21, 95% CI 3.36 to 5.27; participants = 6272, 2 studies; moderate-certainty evidence).When compared with cotrimoxazole, IPTp-mefloquine plus cotrimoxazole probably results in a 48% reduction in maternal peripheral parasitaemia at delivery (RR 0.52, 95% CI 0.30 to 0.93; 989 participants, 2 studies; moderate-certainty evidence) and a 72% reduction in placental malaria (RR 0.28, 95% CI 0.14 to 0.57; 977 participants, 2 studies; moderate-certainty evidence) but has little or no effect on the incidence of clinical malaria episodes during pregnancy (IRR 0.76, 95% CI 0.33 to 1.76, 1 study; high-certainty evidence) and probably no effect on maternal anaemia at delivery (RR 0.94, 95% CI 0.73 to 1.20; 1197 participants, 2 studies; moderate-certainty evidence), low birth weight rates (RR 1.20, 95% CI 0.89 to 1.60; 1220 participants, 2 studies; moderate-certainty evidence), and rates of spontaneous abortion and stillbirth (RR 1.12, 95% CI 0.42 to 2.98; 1347 participants, 2 studies; very low-certainty evidence). Mefloquine was associated with higher risks of drug-related vomiting (RR 7.95, 95% CI 4.79 to 13.18; 1055 participants, one study; high-certainty evidence) and dizziness (RR 3.94, 95% CI 2.85 to 5.46; 1055 participants, 1 study; high-certainty evidence).

Authors' conclusions: Mefloquine was more efficacious than sulfadoxine-pyrimethamine in HIV-uninfected women or daily cotrimoxazole prophylaxis in HIV-infected pregnant women for prevention of malaria infection and was associated with lower risk of maternal anaemia, no adverse effects on pregnancy outcomes (such as stillbirths and abortions), and no effects on low birth weight and prematurity. However, the high proportion of mefloquine-related adverse events constitutes an important barrier to its effectiveness for malaria preventive treatment in pregnant women.

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Conflict of interest statement

RG, JJA, and CM are authors of two trials of mefloquine to prevent malaria in pregnancy (published in 2014) that are candidates for inclusion in this review. MP has no known conflicts of interest. CPD has no known conflicts of interest. FtK has no known conflicts of interest.

Figures

1
1
Indicators and impact of malaria infection in mothers and infants.
2
2
Conceptual framework of malaria chemoprevention. Reproduced under the terms of a Creative Commons Licence from Radeva‐Petrova 2014.
3
3
Study flow diagram.
4
4
‘Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.
5
5
‘Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
1.1
1.1. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 1 Clinical malaria episodes during pregnancy.
1.2
1.2. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 2 Maternal peripheral parasitaemia at delivery.
1.3
1.3. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 3 Placental malaria.
1.4
1.4. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 4 Mean haemoglobin at delivery.
1.5
1.5. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 5 Maternal anaemia at delivery.
1.6
1.6. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 6 Severe maternal anaemia at delivery.
1.7
1.7. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 7 Cord blood parasitaemia.
1.8
1.8. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 8 Cord blood anaemia.
1.9
1.9. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 9 Mean birth weight.
1.10
1.10. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 10 Low birth weight.
1.11
1.11. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 11 Low birth weight by gravidity.
1.12
1.12. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 12 Prematurity.
1.13
1.13. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 13 Malaria in first year of life.
1.14
1.14. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 14 Hospital admissions in first year of life.
1.15
1.15. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 15 SAEs during pregnancy.
1.16
1.16. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 16 Stillbirths and abortions.
1.17
1.17. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 17 Congenital malformations.
1.18
1.18. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 18 Maternal mortality.
1.19
1.19. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 19 Neonatal mortality.
1.20
1.20. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 20 Infant mortality.
1.21
1.21. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 21 AEs: vomiting.
1.22
1.22. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 22 AEs: fatigue/weakness.
1.23
1.23. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 23 AEs: dizziness.
1.24
1.24. Analysis
Comparison 1 Mefloquine versus sulfadoxine‐pyrimethamine, Outcome 24 AEs: headache.
2.1
2.1. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 1 Clinical malaria episodes during pregnancy.
2.2
2.2. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 2 Maternal peripheral parasitaemia at delivery (PCR).
2.3
2.3. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 3 Placental malaria (blood smear).
2.4
2.4. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 4 Placental malaria (PCR).
2.5
2.5. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 5 Mean haemoglobin at delivery.
2.6
2.6. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 6 Maternal anaemia at delivery (< 9.5 g/dL).
2.7
2.7. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 7 Maternal severe anaemia at delivery.
2.8
2.8. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 8 Cord blood parasitaemia.
2.9
2.9. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 9 Mean birth weight.
2.10
2.10. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 10 Low birth weight.
2.11
2.11. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 11 Prematurity.
2.12
2.12. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 12 SAEs during pregnancy.
2.13
2.13. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 13 Spontaneous abortions and stillbirths.
2.14
2.14. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 14 Congenital malformations.
2.15
2.15. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 15 Maternal mortality.
2.16
2.16. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 16 Neonatal mortality.
2.17
2.17. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 17 Mother‐to‐child transmission HIV.
2.18
2.18. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 18 AEs: vomiting.
2.19
2.19. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 19 AEs: fatigue/weakness.
2.20
2.20. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 20 AEs: dizziness.
2.21
2.21. Analysis
Comparison 2 Mefloquine plus cotrimoxazole versus cotrimoxazole, Outcome 21 AEs: headache.
3.1
3.1. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 1 Maternal peripheral parasitaemia at delivery (PCR).
3.2
3.2. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 2 Placental malaria (PCR).
3.3
3.3. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 3 Placental malaria (blood smear).
3.4
3.4. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 4 Mean haemoglobin at delivery.
3.5
3.5. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 5 Maternal anaemia at delivery (< 9.5 g/dL).
3.6
3.6. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 6 Mean birth weight.
3.7
3.7. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 7 Low birth weight.
3.8
3.8. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 8 Prematurity.
3.9
3.9. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 9 SAEs during pregnancy.
3.10
3.10. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 10 Stillbirths.
3.11
3.11. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 11 Spontaneous abortions.
3.12
3.12. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 12 Congenital malformations.
3.13
3.13. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 13 Maternal mortality.
3.14
3.14. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 14 Neonatal mortality.
3.15
3.15. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 15 Infant deaths after 7 days.
3.16
3.16. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 16 AEs: vomiting.
3.17
3.17. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 17 AEs: fatigue/weakness.
3.18
3.18. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 18 AEs: dizziness.
3.19
3.19. Analysis
Comparison 3 Mefloquine versus cotrimoxazole, Outcome 19 AEs: headache.
4.1
4.1. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 1 Maternal peripheral parasitaemia during pregnancy.
4.2
4.2. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 2 Placental malaria.
4.3
4.3. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 3 Mean birth weight.
4.4
4.4. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 4 Low birth weight.
4.5
4.5. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 5 Prematurity.
4.6
4.6. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 6 Stillbirths.
4.7
4.7. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 7 Spontaneous abortions.
4.8
4.8. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 8 Congenital malformations.
4.9
4.9. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 9 Maternal mortality.
4.10
4.10. Analysis
Comparison 4 Mefloquine versus placebo, Outcome 10 Infant mortality.

Update of

References

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References to other published versions of this review

González 2015
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