Antihistamines are a group of medications which can be used for the following conditions :
Some antihistamines, such as chlorpheniramine, dexchlorpheniramine, tripolidine, diphenhydramine, hydroxyzine and promethazine may cause drowsiness.
Other newer antihistamines, such as cetirizine, loratadine, fexofenadine, desloratadine and levocetirizine are less likely to cause drowsiness.
While some antihistamines may be available Over-the-Counter, other antihistamines require a doctor's prescription.
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