Ketotifen Dispersible Tablets This drug is mainly used for the treatment of allergic rhinitis, allergic bronchial asthma and cough variant asthma. This drug is usually taken for a short period of time and the effect is not obvious in some patients. It may take 2 weeks or even more than 1-2 months depending on the condition before significant anti-allergic effects may occur. Patients with allergies to this drug are prohibited from using it. Some patients taking this drug may experience side effects, such as fatigue, drowsiness, dry mouth, nausea and, less commonly, dizziness, headache and weight gain. Therefore, when taking this drug, do not work at height, drive or ride a bike, and always take it under the guidance of a doctor.