Zyrtec 10Mg Tablet Contains Cetirizine Hydrochloride, A Second-Generation Antihistamine Used For The Treatment Of Allergy Symptoms. Cetirizine Is Known For Its Ability To Relieve Symptoms Of Hay Fever (Allergic Rhinitis) Such As Sneezing, Runny Nose, And Itchy Eyes, As Well As Symptoms Of Urticaria (Hives) Like Itching And Swelling. Unlike First-Generation Antihistamines, Cetirizine Is Less Likely To Cause Drowsiness, Making It Suitable For Daytime Use. Side Effects: While Zyrtec Is Generally Well-Tolerated, Some Side Effects May Occur, Including: Drowsiness (In Some Individuals) Headache Dry Mouth Fatigue Dizziness Rare But Serious Side Effects Can Include Trouble Breathing, Swelling Of The Face, Lips, Or Tongue (Indicating An Allergic Reaction), And Fast Or Irregular Heartbeats. Precautions: Pregnancy And Breastfeeding: Zyrtec Should Be Used During Pregnancy Only If Clearly Needed And Under Medical Advice. It Is Excreted In Breast Milk, So It Should Be Used With Caution By Breastfeeding Mothers. Kidney Impairment: People With Kidney Problems May Require Dose Adjustments. Drug Interactions: Zyrtec May Interact With Other Medications, Including Alcohol And Sedatives, Which Can Increase The Sedative Effects.