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Sedating effect of antihistamine

Histamine can cause itching, sneezing, runny nose, and watery eyes.

Also, in some persons histamine can close up the bronchial tubes (air passages of the lungs) and make breathing difficult.

They work by preventing the effects of a substance called histamine, which is produced by the body.However, if itching is still a problem your doctor may prescribe you an antihistamine.Antihistamines are most commonly used to control the symptoms of allergies such as hay fever.If you can't, consider an allergy medication with an added decongestant.Antihistamines combined with a decongestant are usually marked with a "D." Claritin-D, Allegra-D, and Zyrtec-D all contain a decongestant called pseudoephedrine, the same active ingredient that powers Sudafed.If you're shopping for allergy medication, we'll assume your eyes are itchy, your nose is running, and you can't stop sneezing.But if you can still breathe through your nose, proceed to Step 2.Some of the antihistamines are also used to prevent motion sickness, nausea, vomiting, and dizziness.In patients with Parkinson's disease, diphenhydramine may be used to decrease stiffness and tremors.It makes your nose feel less stopped up by narrowing the blood vessels inside your nostrils.Pseudoephedrine's usefulness when making methamphetamine means that in the United States, these drugs need to be purchased directly from the pharmacist with a government ID.

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