Nasal antihistamines are nose sprays which deliver allergy medication directly to the site of seasonal allergy symptoms for relief of nasal and sinus problems caused by allergies. Decongestants narrow the capillaries in the nose lining which reduces the amount of blood that flows through the area, allowing swollen tissue to shrink thereby allowing air to pass through more easily.
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Antihistamines or Decongestants? Getting Allergy Relief
Discusses the difference between the two remedies, how each of them work, and what benefits each has as well as what downsides go along with each. - Antihistamines or Decongestants? Getting Allergy Relief
http://www.webmd.com/allergies/antihistamines-1
Decongestants: OTC Relief for Congestion
Offers information about over the counter decongestants, including how they work, what interactions they have with other drugs, and how to read the labels of decongestants. - Decongestants: OTC Relief for Congestion
http://familydoctor.org/online/famdocen/home/otc-center/otc-medicines/859.html
Nasal Antihistamines and Decongestants
Drugs.com's list of decongestants and of nasal antihistamines, each with user reviews, their benefits, and contraindications. - Nasal Antihistamines and Decongestants
http://www.drugs.com/drug-class/nasal-antihistamines-and-decongestants.html