Calcitriol is believed to be the active hormone which exerts vitamin D activity in the body, adverse effects are, in general, similar to those encountered with excessive vitamin D intake, ie, hypercalcemia syndrome or calcium intoxication, depending on the severity and duration of hypercalcemia. Because of the short biological half-life of Calcitriol, pharmacokinetic investigations have shown normalization of elevated serum calcium within a few days of treatment withdrawal, ie, much faster than in treatment with vitamin D3 preparations.Hypersensitivity reactions (pruritus, rash, urticaria, and very rarely severe erythematous skin disorders) may occur in susceptible individuals. One case of erythema multiforme and one case of allergic reaction (swelling of lips and hives all over the body) were confirmed by rechallenge.Calcitriol is a synthetic vitamin D analog which is active in the regulation of the absorption of calcium from the gastrointestinal tract and its utilization in the body. Cacitriol is available as capsules containing 0.25 mcg. Calcitriol Capsules contain butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) as antioxidants.
The main adverse drug reaction associated with calcitriol therapy is hypercalcaemia – early symptoms include: nausea, vomiting, constipation, anorexia, apathy, headache, thirst, sweating, and/or polyuria. Compared to other vitamin D compounds in clinical use (cholecalciferol, ergocalciferol), calcitriol has a higher risk of inducing hypercalcaemia. However, such episodes may be shorter and easier to treat due to its relatively short half-life.Calcitriol is used to treat hyperparathyroidism (overactive parathyroid glands) and metabolic bone disease in people who have chronic kidney failure and are not receiving dialysis.Calcitriol is also used to treat calcium deficiency (hypocalcemia) and metabolic bone disease in people who are receiving dialysis.Calcitriol is also used to treat calcium deficiency in people with hypoparathyroidism (underactive parathyroid glands) caused by surgery, disease, or other conditions.
Calcitriol is a form of vitamin D. It works by decreasing the rate of skin cell reproduction.Calcitriol topical (for the skin) is used to treat plaque psoriasis (raised, silvery flaking of the skin) in adults.Calcitriol topical is for use only on areas of psoriasis. Avoid getting it on healthy skin areas. Calcitriol topical should not be applied to the face or the vaginal using this medication and call your doctor if you have a serious side effect such as blistering or severe redness, itching, or other irritation of treated skin.Using calcitriol topical can affect your body’s ability to metabolize calcium. This can result in high levels of calcium in your blood (hypercalcemia). Symptoms of this condition include nausea, loss of appetite, constipation, increased thirst and urination, muscle weakness, confusion, and feeling tired or restless. Call your doctor if you have any of these symptoms.
Calcitriol is used to treat or prevent certain problems that can happen with long-term kidney dialysis, such as low levels of calcium or high levels of parathyroid hormone. Calcitriol is usually used along with a certain diet, supplements, and sometimes other people get enough vitamin D from exposure to the sun and from fortified food products (e.g., dairy products, vitamins). Before regular vitamin D can be used by the body, it needs to be changed to the active form by the liver and kidneys. People with kidney disease cannot make enough of the active form of vitamin D.