Most sedating antihistamine
They do, however, have the potential for negative effects if taken with other drugs, so let your doctor know if you are taking more than one medication.
Doxylamine can be used by itself as a sleep aid or combined with other drugs for cold and allergy relief (usually in a night-time formula).
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Antihistamines are commonly used for the treatment of various allergic diseases, and can be taken in oral, nasal spray, eye drop, and injected forms.