Y-Clast Infusion is used to treat or prevent weakening of the bones (osteoporosis) caused by menopause or use of steroids. Using this medicine can reduce your risk of breaking bones. It is also used to treat high levels of calcium in people who have cancer. Y-Clast Infusion is given by a doctor or nurse. How much you are given, and how often, will be decided by your doctor. It may just be a single injection or you may need regular injections depending upon your underlying condition. Your doctor will ask you to drink plenty of water before the injection, to avoid getting dehydrated. It may take several days to get the full benefit of this drug. Y-Clast Infusion is only part of a treatment program that may also include changes to your diet and taking calcium and vitamin supplements. The most common side effects include nausea, fatigue, anemia, bone pain, constipation, fever, vomiting, and breathlessness. Y-Clast Infusion can cause serious kidney problems, especially if you are dehydrated, if you take diuretic medicine (water pills) or if you already have kidney disease. It can also cause low levels of calcium in the blood and pain in the mouth or jaw. These are serious side effects and need urgent medical attention. Tell your doctor straight away if you notice any of these. You should not be given this medicine if you are pregnant or breastfeeding. Before taking it, tell your doctor if you have kidney problems or low calcium levels. Also, let your doctor know what other medicines you are taking. Some of them may affect, or be affected by, this injection, especially medicines used to treat severe infections and medicines used to treat cancer and osteoporosis. You may need frequent medical tests to check your kidney function and calcium levels. Avoid smoking as it can reduce your bone mineral density, making fractures more likely. Drinking large amounts of alcohol can also cause bone loss and should be avoided.