L Hist 5mg Tablet is a medication used to relieve symptoms of hay fever and allergies It contains Levocetirizine which works by blocking the action of histamine in the body Histamine is released during allergic reactions and reducing its effects helps manage symptoms like a runny nose and itching It is important to follow your doctors guidance for optimal use The medicine can be taken with or without food but it is recommended to maintain a consistent daily schedule Common side effects may include sleepiness dry mouth headache vomiting and nasopharyngitis Special precautions include monitoring for drowsiness and avoiding activities requiring alertness Patients with kidney or liver issues should inform their doctor before starting treatment Promptly consult the doctor in case of a missed dose to maintain the medications effectiveness