Calcitonin, which is sold under the brand name «Fortical”, is a nasal spray indicated for the treatment of osteoporosis in women who have been in menopause for at least 5 years. Plus, it is typically used in combination with Calcium and Vitamin D. According to webmd.com, this product works by “slowing bone loss to help maintain strong bones and reduce your risk of fractures”. You should tell your doctor, before using Calcitonin nasal spray, if you have hypercalcemia (i.e. high levels of calcium in one’s blood). You should also tell them if you’ve ever been treated for any nasal or sinus problems. Based on the information posted on drugs.com, Calcitonin “may increase your risk of developing certain types of cancer”. Therefore, consulting a doctor before using it is highly recommended. You should also consult them to know if it is safe for you to use this nasal spray during pregnancy and/or breastfeeding, especially since it is still not known whether Calcitonin could in any way harm the fetus or the nursing baby. As for the common side effects, they include stuffy nose, scabs inside your nose, or bleeding from it. Remember to call your doctor when any of the following side effects occurs: severe nasal irritation, numbness around the mouth, irregular heartbeat, and dizziness.