Pseudoephedrine

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Acrivastine/ pseudoephedrine is used for:
Relieving symptoms associated with allergies, including sneezing, runny nose, itching, watery eyes, and nasal stuffiness. It may also be used for certain conditions as determined by your doctor.

Acrivastine/pseudoephedrine is an antihistamine and decongestant combination. It works by blocking histamine at H1 receptor sites and causes vasoconstriction and shrinkage of the nasal mucous membranes, which helps to promote nasal drainage and relieve watery eyes, runny nose, and sneezing.