Glenzal 5 MG Tablet is an antihistamine medicine. It is used widely to relieve allergic symptoms like runny nose, sneezing, redness of your nose, watery eyes, itching, rash and hives (raised bumps on your skin). It stops the action of a natural substance called histamine produced in your body during an allergic reaction. Glenzal 5 MG Tablet is generally safe to use. However, it may cause some side effects like drowsiness, dry mouth, headache, and tiredness. These symptoms are mild and subside with time. You may take Glenzal 5 MG Tablet with or without food. It is preferably taken in the evening. The dose and duration will depend on the condition you are taking it for. Consult your doctor if there is no improvement in your symptoms after the treatment. Do not increase the dose or take this tablet more often than prescribed by your doctor. Before taking Glenzal 5 MG Tablet, tell your doctor if you have/had any medical condition like liver, kidney or heart disease. Your doctor should also be aware of any other medications that you are taking since many of them may alter the efficacy of this medicine. If you are pregnant or are breastfeeding, you should consult your doctor before using this medication.