Prenoxid 200mg Tablet is an antitussive medicine. It is used for the treatment of dry cough. It works by suppressing the cough reflex in the brain. It can also provide relief from symptoms like watery eyes, sneezing, runny nose, and throat irritation. Prenoxid 200mg Tablet can be taken with or without food, but take it at the same time to get the most benefit. It should be taken as your doctor's advice. 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. Swallow the tablet whole with water. You should take this medicine 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, never take a double dose. You must inform your doctor if symptoms do not get improve within 7 days of the treatment. The most common side effects of this medicine include allergic reactions, allergic skin reactions, constipation, and dryness in the mouth. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Generally, it is advised to drink plenty of fluids while on treatment with this medicine. Before taking this medicine let your doctor know if you suffer from asthma, as close monitoring is required while taking this medicine. 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. Inform your doctor if you are pregnant, planning a pregnancy, or breastfeeding.