Fenistil Drops Contain Dimethindene Maleate, An Antihistamine Used To Relieve Allergic Symptoms Such As Itching, Rashes, Hay Fever, And Nasal Congestion. It Works By Blocking Histamine, The Substance Responsible For Triggering Allergic Reactions In The Body. Fenistil Drops Are Suitable For Both Adults And Children, Providing Fast-Acting Relief From Mild To Moderate Allergic Reactions And Helping To Manage Skin Irritation Caused By Insect Bites Or Hives. Side Effects: Fenistil Drops Are Generally Well-Tolerated. Possible Side Effects Include: Drowsiness (Most Common In The Initial Days Of Use) Dry Mouth Dizziness Gastrointestinal Discomfort Rare Side Effects: Skin Rash Or Itching Difficulty Breathing (Requires Immediate Medical Attention) If Severe Or Unusual Side Effects Occur, Discontinue Use And Consult A Healthcare Provider. Precautions: Allergies: Avoid Using Fenistil Drops If You Are Allergic To Dimethindene Maleate Or Other Ingredients In The Formulation. Infants: Use With Caution In Children Under 1 Year And Only Under Medical Supervision. Pregnancy And Breastfeeding: Consult A Doctor Before Use If You Are Pregnant Or Breastfeeding. Driving And Machinery: May Cause Drowsiness; Avoid Driving Or Operating Machinery After Taking The Drops. Medical Conditions: Inform Your Doctor If You Have Glaucoma, Epilepsy, Or Other Medical Conditions Before Using The Drops.