Why Do Antihistamines Help With Headaches?

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Nasal Decongest-Antihistamine Oral Precautions

Before taking chlorpheniramine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

  • breathing...
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