antagonists) and the relationship between specific antihistamines and specific birth defects.
Although many findings provide reassurance about the relative safety of many antihistamine drugs and that any malformation reported is most probably caused by chance, studies are still required to assure fetal safety.
Depending on the type of allergy, oral antihistamines may be taken regularly or seasonally to combat responses to allergens.
Common allergens include dog and cat hair, dust mites, grass and tree pollen, and molds and mildew.
Antihistamines work by blocking the effects of histamine, a chemical released by mast cells during an allergic response to an allergen.
Histamine irritates and inflames the airways to produce sneezing and mucus production.
As pruritus is sometimes troublesome for pregnant women topical medications like emollients should be tried first in the first trimester of pregnancy.
Also pregnant women should be advised to consult their health care provider before taking any medication.Histamine is stored in Antihistamines are medications that counteract the effect of the natural chemical histamine.They are valuable drugs to reduce symptoms due to allergic diseases, especially those mediated by histamine.Antihistamines attach to the areas on cells that histamines attach to, thereby blocking the allergic response.Antihistamines are most effective when taken before exposure to an allergen.The drugs of the first antihistamine generation are: promethazine, alimemazine, dexchlorpheniramine, brompheniramine, buclizine, carbinoxamine and doxylamine, are sedating and elicit a drowsiness which can be awkward.