Benefits of morning sickness drug questioned by 40-year-old
The research was conducted by scientists from the Merrell-National Laboratories - which is now defunct - in the 1970s, and it sought to test the effects of pyridoxine-doxylamine in more than 2,300 pregnant women experiencing morning sickness.

Although the results of the study were not published at the time, it has emerged that both Health Canada and the United States Food and Drug Administration (FDA) used the data to help inform their decision to approve pyridoxine-doxylamine.

However, Dr. Nav Persaud, a family physician and researcher at St. Michael's Hospital in Toronto, Canada, has identified a number of flaws in how the study was conducted and how the results were analyzed. He says that these factors raise questions about the benefits of the drug....

http://www.medicalnewstoday.com/articles/314989.php
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