Hectorol is a prescription vitamin D medication for the treatment of secondary hyperparathyroidism or SHPT. Vitamin D is important for strong bones. You get vitamin D from some of the foods you eat, from sunlight being absorbed into your skin, and by taking vitamin supplements. Vitamin D is made "active" by passing through the liver and kidneys, where it is turned into a hormone. Active vitamin D helps balance minerals within your body, such as calcium and phosphorus, and keeps your bones strong. When you have kidney disease, your kidneys have trouble turning vitamin D into the active hormone. This is when you need additional help replacing active vitamin D and when your physician may prescribe Hectorol.

Headache, nausea, vomiting, itching, unusual tiredness, or upset stomach may occur. If any of these effects persist or worsen, notify your doctor promptly. Tell your doctor immediately if any of these serious side effects occur: swelling, constipation, unusual weight gain or weight loss, open sores (abscess), trouble breathing, joint pain, trouble sleeping, unusually slow heartbeat, dizziness. Tell your doctor immediately if any of these unlikely but serious side effects occur: bone pain, muscle pain, change in amount of urine, increased thirst, loss of appetite, metallic taste, severe stomach pain. If you notice other effects not listed above, contact your doctor or pharmacist.