Randomized Controlled Trial

Ondansetron compared with doxylamine and pyridoxine for treatment of nausea in pregnancy: a randomized controlled trial.

Obstet Gynecol. 2014 Oct 1;124(4):735-42.
Randomized Controlled Trial

Studying the antiemetic effect of vitamin B6 for morning sickness: pyridoxine and pyridoxal are prodrugs.

J Clin Pharmacol. 2014 Dec 1; 54 (12): 1429-33.
Randomized Controlled Trial

Effectiveness of delayed-release doxylamine and pyridoxine for nausea and vomiting of pregnancy: a randomized placebo controlled trial.

Am. J. Obstet. Gynecol. 2010 Dec 1; 203 (6): 571.e1-7.