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How Long Does Unisom Stay In Your System?

Unisom (doxylamine succinate) is a first-generation antihistamine available as an over-the-counter medication in the United States.  It is commonly used as a sleep aid (to combat insomnia), an antiallergenic (to reduce severe allergies), and sometimes to treat symptoms of the common cold.  The pharmacological ingredient within Unisom, known as “doxylamine,” functions predominantly via antagonism of H1 …

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