Ventek Tab is a drug that is developed to assist with breathing difficulties caused by different respiratory disorders including asthma, chronic obstructive pulmonary disease (COPD) and allergic rhinitis. The active ingredient in this medication is montelukast sodium, a leukotriene receptor antagonist that acts by blocking the effect of leukotrienes, a group of substances produced by the body in response to allergens or irritants. Leukotrienes can cause inflammation and swelling in the airways, leading to breathing difficulties and other respiratory symptoms. The tablet should be swallowed whole with a glass of water, and should not be crushed, chewed, or dissolved.