The following information is taken directly from an authoritative source, the Lexi-Comp website -- http://online.lexi.com/lco/action/doc/retrieve/docid/preglac_f/303420.
While the use of Fexofenadine during pregnancy is generally deemed to be safe for the mother and fetus there is no absolute proof of that. The same principles apply to many other drugs, including Monteleukast.
Fexofenadine in Pregnancy & Lactation (Pregnancy and Lactation, In-Depth)
With each pregnancy, there is a risk of birth defect, loss, or other adverse outcome regardless of drug exposure. While Lexicomp and its third party providers have taken great care to ensure the accuracy of the information and recommendations presented, application of the information in this monograph to a specific patient is the responsibility of the healthcare provider. This information is not a substitute for individual patient assessment and consideration of factors unique to the patient by a healthcare provider. Healthcare providers and their patients should not use the information as a substitute for actual medical care. Use of this information is subject to Lexicomp’s Terms & Conditions and Disclaimer, which are available on the Lexicomp Online home page.
Basically, the preceding reinforces the need to discuss the safety of this and any other drug, including Monteleukast, with your physician (PC).
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