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The active ingredients in most over-the-counter and prescribed pharmaceutical decongestants are pseudoephedrine or phenylephrine. Several foods can be very effective at relieving congestion and a number of foods are natural decongestant remedies. Onions are a natural decongestant and expectorant and a raw onion is enough to start loosening phlegm and mucus. Citrus fruits and spicy food also act as effective decongestants.
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