Acupuncture and Doxylamine-Pyridoxine for Nausea and Vomiting in Pregnancy: A Randomized, Controlled, 2×2 Factorial Trial

# Acupuncture and Doxylamine-Pyridoxine for Nausea and Vomiting in Pregnancy: Evidence from a Large International Study

Nausea and vomiting during pregnancy are experienced by up to 85% of pregnant women and are most common between the sixth and eighth weeks of gestation. Although most cases are mild, approximately 10% of women develop moderate to severe symptoms that can significantly affect quality of life, capacity to work, and overall well-being. In more severe situations, some pregnant women even consider terminating desired pregnancies because of the intensity of symptoms. Despite this urgent need for effective treatments, safe and proven therapeutic options for pregnant women remain limited, creating an important challenge in obstetric clinical practice.

A recently published international study investigated two promising therapeutic approaches: acupuncture and the combination of doxylamine-pyridoxine, both individually and in combination. This research, conducted at 13 hospitals in China with 352 pregnant women, used a rigorous methodological design called a factorial clinical trial, which allowed simultaneous evaluation of the independent and combined effects of both treatments. Participants were divided into four groups: true acupuncture with doxylamine-pyridoxine, sham acupuncture with doxylamine-pyridoxine, true acupuncture with placebo, and sham acupuncture with placebo. Over 14 days, they received daily 30-minute acupuncture sessions and oral medication, with rigorous symptom monitoring through validated questionnaires.

The results showed that both acupuncture and doxylamine-pyridoxine, when used individually, produced statistically significant improvements in nausea and vomiting symptoms compared with controls. Acupuncture resulted in a mean reduction of 0.7 points on the symptom scale, while doxylamine-pyridoxine produced a 1.0-point reduction. Although these values may seem modest on a 15-point scale, they represent real symptom relief for many women. Even more encouraging was the finding that combining both treatments produced a 1.6-point reduction, suggesting complementary effects.

In addition to improvement in core symptoms, benefits were observed in quality of life, mood, and functional capacity of pregnant women.

For patients and healthcare professionals, these results provide robust scientific evidence on therapeutic options that may be considered in the management of pregnancy-related nausea and vomiting. Acupuncture emerges as a valid non-pharmacological alternative, especially for pregnant women who prefer to avoid medications or who have not had success with other approaches. Side effects of acupuncture were limited to small bruises and local discomfort at the application points. Doxylamine-pyridoxine, already recommended by international guidelines, also proved effective in this population, with side effects mainly related to drowsiness.

The possibility of combining both approaches may be particularly valuable for more resistant cases, offering a more comprehensive therapeutic strategy.

However, some aspects should be considered in interpreting these results. The study observed that about 70% to 85% of the improvement in active treatment groups was also present in control groups, indicating important effects related to the support provided and to the expectation of improvement. One finding that deserves attention was a slight increase in the proportion of small-for-gestational-age infants in the group receiving doxylamine-pyridoxine, although the number of cases was small and requires further investigation in future studies. Additionally, the intensive daily acupuncture protocol used in the study may not be easily replicable in all clinical settings, especially considering aspects of cost and availability of qualified professionals.

The study provides encouraging evidence that both acupuncture and doxylamine-pyridoxine represent valid therapeutic options for pregnant women with moderate to severe nausea and vomiting. Although individual benefits are modest, combining the approaches may offer more substantial relief. These findings are particularly relevant given the scarcity of safe and effective therapeutic options during pregnancy. For clinical practice, the results suggest that an individualized approach, considering patient preferences, symptom severity, and availability of resources, may optimize management of this common but potentially debilitating condition.