Xyzal 5Mg Tablet (30'S) Contains Levocetirizine, A Second-Generation Antihistamine Used Primarily For Treating Allergic Symptoms. It Is Effective In Relieving Symptoms Associated With Hay Fever (Allergic Rhinitis), Chronic Urticaria (Hives), And Other Allergic Reactions. Overview: Active Ingredient: Levocetirizine Levocetirizine Is A Potent, Non-Sedating Antihistamine That Works By Blocking The Effects Of Histamine, A Substance In The Body That Causes Allergic Reactions Like Swelling, Itching, And Congestion. Side Effects: Common: Drowsiness, Dry Mouth, Headache, Dizziness, And Fatigue. Serious: Severe Allergic Reactions, Trouble Breathing, And Swelling Of The Face Or Throat (Rare). Precautions: Kidney Function: Levocetirizine Should Be Used With Caution In Patients With Renal Impairment, And The Dose May Need Adjustment. Pregnancy & Breastfeeding: Consult A Healthcare Provider Before Use, As The Safety During Pregnancy And Breastfeeding Is Not Fully Established. Driving & Operating Machinery: Although Levocetirizine Is Less Sedating Than Older Antihistamines, It May Still Cause Mild Drowsiness In Some People. Avoid Activities That Require Full Alertness If You Experience This Side Effect.