Foods sometime play a role. Ideally the best treatment is avoidance of these substances, but that is impractical in most cases. In the allergic patient, the release of histamine and similar substances results in congestion and excess production of watery nasal mucus. Antihistamine Help relieve the sneezing and runny nose of allergy. Many antihistamines are now available without a prescription.
Decongestants shrink congested nasal tissues.
Combinations of antihistamines with decongestants are also available. All these preparations have potential side effects, and patients must heed the warnings of the package or prescription insert. This is especially important if the patient suffers from high blood pressure, glaucoma, irregular heart beats, difficulty in urination, or is pregnant. Allergy shots are the most specific treatment available, and they are highly successful in allergic patients. Skin tests or at times blood tests are used to make up treatment vials of substances to which the patient is allergic.