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Meta-Analysis
. 2014 Mar 19:13:20.
doi: 10.1186/1475-2891-13-20.

A systematic review and meta-analysis of the effect and safety of ginger in the treatment of pregnancy-associated nausea and vomiting

Estelle Viljoen  1 , Janicke Visser, Nelene Koen, Alfred Musekiwa
Affiliations
Meta-Analysis

A systematic review and meta-analysis of the effect and safety of ginger in the treatment of pregnancy-associated nausea and vomiting

Estelle Viljoen et al. Nutr J. .

Abstract

Background and objectives: Nausea and vomiting during pregnancy (NVP) occur commonly. Possible harmful side-effects of conventional medicine to the fetus create the need for alternative options to relieve NVP. This systematic review (SR) investigated current evidence regarding orally administered ginger for the treatment of NVP. The primary objective was to assess the effectiveness of ginger in treating NVP. The secondary objective was to assess the safety of ginger during pregnancy.

Methods: A comprehensive electronic bibliographic database search was carried out. Randomized controlled trials (RCTs) of the efficacy of orally administered ginger, as treatment for NVP in pregnant women at any stage of pregnancy, published in English, were included. Two researchers independently extracted data and assessed trial quality. RevMan5 software (Cochrane Collaboration) was used for data analysis. p < 0.05 was considered statistically significant.

Results: Twelve RCTs involving 1278 pregnant women were included. Ginger significantly improved the symptoms of nausea when compared to placebo (MD 1.20, 95% CI 0.56-1.84, p = 0.0002, I² = 0%). Ginger did not significantly reduce the number of vomiting episodes during NVP, when compared to placebo, although there was a trend towards improvement (MD 0.72, 95% CI -0.03-1.46, p = 0.06, I² = 71%). Subgroup analyses seemed to favor the lower daily dosage of <1500 mg ginger for nausea relief. Ginger did not pose a significant risk for spontaneous abortion compared to placebo (RR 3.14, 95% CI 0.65-15.11, p = 0.15; I² = 0%), or to vitamin B₆ (RR 0.49, 95% CI 0.17-1.42, p = 0.19, I² = 40%). Similarly, ginger did not pose a significant risk for the side-effects of heartburn or drowsiness.

Conclusions: This review suggests potential benefits of ginger in reducing nausea symptoms in pregnancy (bearing in mind the limited number of studies, variable outcome reporting and low quality of evidence). Ginger did not significantly affect vomiting episodes, nor pose a risk for side-effects or adverse events during pregnancy. Based on evidence from this SR, ginger could be considered a harmless and possibly effective alternative option for women suffering from NVP. International Prospective Register of Systematic Reviews (PROSPERO) registration number: CRD42011001237.

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Figures

Figure 1
Figure 1
Diagrammatic representation of the process followed in the selection of studies.
Figure 2
Figure 2
Methodological quality graph: judgments about each methodological quality item presented as percentages for all included studies (n = 12).
Figure 3
Figure 3
Forest plot of the improvement in nausea symptoms measured by change in VAS scores (ginger versus placebo).
Figure 4
Figure 4
Forest plot of the improvement in nausea symptoms as measured by the change in VAS scores (ginger versus Vitamin B6): subgroup analysis regarding dose (≥1500 mg versus < 1500 mg).
See this image and copyright information in PMC

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