antihistamines are used to treat allergy symptoms. we have two generations of antihistamines: first generation antihistamines like chlorpheniramine dimenhydrinate diphenhydramine doxylamine are considered safe to use during pregnancy. these medications have sedative effect (cause sleepiness). the newer non-sedating antihistamines like cetirizine desloratadine fexofenadine and loratadine are best avoided in pregnancy as we have no strong evidence confirming its safety in pregnancy. hope this helps. consult a general medicine physician online for further queries --> <link>
can i take antihistamines (an otc drug) when pregnant?