SIDE EFFECTS: Sleepiness occurs in 14% of patients. Dry mouth, nausea, headache, fatigue, jitteriness and sore throat are infrequently reported with cetirizine.
Antihistamines block the effects of histamines. Histamines cause symptoms of allergy when released by allergic reactions in the body. Antihistamines block the ability of histamine to promote the allergy symptoms. For further information, please read the Allergic Rhinitis article.
Call your doctor if your symptoms do not improve, if they get worse, or if you also have a fever.
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