Mycet Lmk Tablet is a combination medicine recommended for treating runny nose and sneezing associated with allergic reactions. Levocetirizine of this medication is an anti allergic element that blocks histamine chemical messenger that causes symptoms like sneezing and runny nose or watery eyes. As leukotriene antagonist, montelukast ingredient of Mycet Lmk Tablet is effective in reducing inflammatory feeling caused by swelling. There are some specific side effects of this drug. These include drowsiness, fatigue, dryness in mouth, flue, constipation etc.