The FDA categorizes Nexium as a category B medication, meaning there is no proven harm to the fetus if the drug is administered to a pregnant subject during the first trimester. QUESTION. Une patiente enceinte âgée de 36 ans présente des symptômes de maladie peptique. Le traitement par des changements dans l’alimentation et le mode de vie ainsi que l’administration d’antiacides l’ont très peu soulagée. There are no controlled studies in breastfeeding women, however the risk of untoward effects to a breastfed infant is possible, or controlled studies show only minimal non-threatening adverse effects. FDA Drug Category: B Nexium is generally prescribed for no longer then eight weeks but if your doctor feels you need a second round of treatment to prolong healing time, a second round may be prescribed. Esomeprazole Breastfeeding Warnings Esomeprazole is the S-isomer of omeprazole and limited data indicate that maternal doses of omeprazole 20 mg daily produce low levels in human milk. Animal studies given high doses of esomeprazole strontium showed effects on developing bone. The FDA categorizes omeprazole (Prilosec) as a category C medication, which means it should only be given during pregnancy when the potential benefit outweighs the potential risks. Effects While Trying to Conceive: Animal studies of up to 56 times the normal human dose showed no effect on fertility or reproduction. Human studies have not been completed, but the drug is not likely to affect human fertility. I'm not sure about nexium, I take it now and I'm breastfeeding and its ok. Honestly I feel your pain unfortunately mine got even worse as the pregnancy continued I just lived off gaviscon. Honestly I feel your pain unfortunately mine got even worse as the pregnancy continued I just lived off gaviscon. Esomeprazole, sold under the brand names Nexium among others, is a medication which reduces stomach acid. It is used to treat gastroesophageal reflux disease , peptic ulcer disease , and Zollinger–Ellison syndrome. Esomeprazole Levels and Effects while Breastfeeding Summary of Use during Lactation Esomeprazole is the S -enantiomer of the proton-pump inhibitor, omeprazole.