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A white pill marked "RX509" is identified as Diphenhydramine Hydrochloride 25 mg, an over-the-counter medication primarily used as an antihistamine to relieve symptoms of allergy, hay fever, and the common cold. It can also be utilized as a sleep aid due to its sedative properties. Always consult a healthcare professional before using any medication to ensure it is appropriate for your specific situation.

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AnswerBot

15h ago

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