Dif 25mg Suspension is an antihistaminic medicine. It is used to treat symptoms of nasal allergy such as sneezing, runny nose, itching, and watery eyes. It may also be used to treat insomnia and motion sickness. Dif 25mg Suspension is best taken before a meal or at bedtime. Take it exactly as prescribed by your doctor. The dose and how often you take it depends on what you are taking it for. Your doctor will decide how much you need to improve your symptoms. Take it for as long as it is prescribed for you. In case, you have missed any doses, take the next dose as soon as you remember it. However, you should never take a double dose. Dizziness and drowsiness are the most common side effect of this medicine. Avoid driving or attention-seeking activities while on treatment with this medicine. In some cases, it may cause also dryness of mouth. To prevent dry mouth, drink more water and maintain good oral hygiene. Before taking this medicine, let your doctor know if you have glaucoma or have any gastro-related issues or have asthma. Inform your doctor if you are pregnant, or breastfeeding. Your doctor should also know about all other medicines you are taking as many of these may make this medicine less effective or change the way it works. Generally, it is advised to avoid alcohol while on treatment.