Xemasin 25mg Tablet is an aromatase inhibitor. It is used in the treatment of breast cancer in women who have gone through menopause. It works by adjusting the level of estrogen and helps in slowing down the growth of cancer cells. Xemasin 25mg Tablet is also used in combination with medication in early cancer to prevent the risk of coming back. It should be taken with food, but take it at the same time every day 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 tablets whole with a drink of water. You should take this medicine for as long as it is prescribed for you. The most common side effects of the medicine include insomnia (difficulty sleeping), headache, nausea, and joint pain If these bother you, or appear serious, let your doctor know. There may be ways of reducing or preventing them. Before taking this medicine, tell your doctor if you are not gone through menopause and still having menstrual periods, or you have a problem with the liver or kidney. 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. Tell your doctor if you are pregnant or breastfeeding. Your doctor may perform some blood tests to check for vitamin D level or bone density.