Alfacalcidol 1.0 microgram soft capsules

Alfacalcidol is indicated in conditions where there is a disturbance of calcium metabolism due to impaired 1-α hydroxylation such as when there is reduced renal function.

The main indications are:

a) Renal osteodystrophy

b) Hyperparathyroidism (with bone disease)

c) Hypoparathyroidism

d) Nutritional and malabsorptive rickets and osteomalacia

e) Pseudo-deficiency (D-dependent) rickets and osteomalacia

f) Hypophosphataemic vitamin D resistant rickets and osteomalacia

Posology

Initial dose for all indications:

The dose of Alfacalcidol should be adjusted thereafter to avoid hypercalcaemia according to the biochemical response. Indices of response include plasma levels of calcium (ideally corrected for protein binding), alkaline phosphatase, parathyroid hormone, as well as radiographic and histological investigations.

Plasma levels should initially be measured at weekly intervals. The daily dose of Alfacalcidol may be increased by increments of 0.25-0.5 microgram. When the dose is established, measurements of calcium, phosphorous and creatinine may be taken every 2-4 weeks.

Most adult patients respond to doses between 1and 3 micrograms per day. When there is biochemical or radiographic evidence of bone healing, (and in hypoparathyroid patients when normal plasma calcium levels have been attained), the dose generally decreases. Maintenance doses are generally in the range of 0.25 to 1 microgram per day. If hypercalcaemia occurs, Alfacalcidol should be stopped until plasma calcium returns to normal (approximately 1 week) then restarted at half the previous dose.

a) Renal bone disease:

Patients with relatively high initial plasma calcium levels may have autonomous hyperparathyroidism, often unresponsive to Alfacalcidol. Other therapeutic measures may be indicated.

Before and during treatment with Alfacalcidol, phosphate binding agents should be considered to prevent hyperphosphataemia. It is particularly important to make frequent plasma calcium measurements in patients with chronic renal failure because prolonged hypercalcaemia may aggravate the decline of renal function.

b) Hyperparathyroidism:

In patients with primary or tertiary hyperparathyroidism about to undergo parathyroidectomy, pre-operative treatment with Alfacalcidol for 2-3 weeks alleviates bone pain and myopathy without aggravating pre-operative hypercalcaemia. In order to decrease post-operative hypocalcaemia, Alfacalcidol should be continued until plasma alkaline phosphatase levels fall to normal or hypercalcaemia occurs.

c) Hypoparathyroidism:

In contrast to the response to parent vitamin D, low plasma calcium levels are restored to normal relatively quickly with Alfacalcidol. Severe hypocalcaemia is corrected more rapidly with higher doses of Alfacalcidol (e.g., 3-5 micrograms) together with calcium supplements.

d) Nutritional and malabsorptive rickets and osteomalacia:

Nutritional rickets and osteomalacia can be cured rapidly with Alfacalcidol. Malabsorptive osteomalacia (responding to large doses of IM or IV parent vitamin D) will respond to small doses of Alfacalcidol.

e) Pseudo-deficiency (D-dependent) rickets and osteomalacia:

Although large doses of parent vitamin D would be required, effective doses of Alfacalcidol are similar to those required to heal nutritional vitamin D deficiency rickets and osteomalacia.

f) Hypophosphataemic vitamin D-resistant rickets and osteomalacia:

Neither large doses of parent vitamin D nor phosphate supplements are entirely satisfactory.

Treatment with Alfacalcidol at normal dosage rapidly relieves myopathy when present and increases calcium and phosphate retention. Phosphate supplements may also be required in some patients.

Method of administration

Oral use

The soft capsules should be swallowed whole with sufficient amount of fluid.

Hypersensitivity to the active substance, arachis oil (peanut oil), soya or to any of the excipients listed in section 6.1.

Hypercalcaemia, metastatic calcification.

Monitoring

During treatment with Alfacalcidol, serum calcium and serum phosphate and creatinine levels should be monitored regularly especially in children, patients with renal impairment and patients receiving high doses. PTH, alkaline phosphatase and calcium phosphates should be monitored as clinically indicated.

Hypercalcaemia

Hypercalcaemia may appear in patients treated with Alfacalcidol. For this reason, patients should be informed about the clinical symptoms connected with hypercalcaemia. Refer section 4.8 (Undesirable effects)

In case of hypercalcaemia, Alfacalcidol treatment should be stopped until serum calcium concentrations return to normal, usually in about 1 week. Alfacalcidol may then be restarted at half the last dose used with monitoring of calcium.

Prolonged hypercalcaemia may aggravate arteriosclerosis, cardiac valve sclerosis or nephrolithiasis and therefore prolonged hypercalcaemia should be avoided when Alfacalcidol is used in these patients. Transient or even long-lasting deterioration of kidney function has been observed. Alfacalcidol should also be used with caution in patients with calcification of pulmonary tissue as this may result in cardiac disease.

Renal

In patients with renal bone disease or severely reduced renal function, a phosphate binding agent could be used simultaneously with alfacalcidol to prevent increased serum phosphate and potential metastatic calcification.

Granulomatous diseases

Alfacalcidol should be used with caution in patients with granulomatous diseases such as sarcoidosis where the sensitivity to vitamin D is increased due to increased hydroxylation activity.

Fructose intolerance

This medicinal product contains sorbitol as an excipient and patients with rare hereditary problems of fructose intolerance (HFI) should not take this medicinal product.

This medicinal product contains 1 mg of alcohol (ethanol) per soft capsule, corresponding to 1% (w/w). The amount of alcohol (ethanol) in one soft capsule of this medicine is equivalent to less than 1 ml of beer or 1 ml of wine. The small amount of alcohol in this medicine has no noticeable effects.

Digitalis glycosides

Concurrent use of digitalis glycosides in the presence of hypercalcaemia due to vitamin D administration increases the potential for cardiac arrhythmias and is therefore contraindicated. Patients taking digitalis and alfacalcidol concomitantly should be frequently monitored with ECG and measurements of plasma levels of digitalis glycosides and calcium.

Thiazide diuretics and calcium containing preparations

Use with caution in patients being treated with thiazide diuretics or calcium containing preparations as they may have an increased risk of developing hypercalcaemia. Calcium levels should be monitored.

Other vitamin D containing preparations

Vitamin D or its analogous should not be given concurrently with alfacalcidol as may enhance the risk of hypercalcaemia.

Anticonvulsants

Patients taking barbiturates or anticonvulsants may require larger doses of Alfacalcidol to produce the desired effect due to the induction of hepatic detoxification enzymes.

Magnesium-containing antacids

Magnesium based antacids and laxatives should not be used during treatment with alfacalcidol due to increased risk of hypermagnesaemia.

Aluminium-containing preparations

Alfacalcidol may increase the serum concentration of aluminium. Patients taking aluminium- containing preparations (e.g. aluminium hydroxide, sucralfate) should be monitored for signs of aluminium related toxicities.

Bile acid sequestrants

Concomitant oral administration of bile acid sequestrants such as cholestyramine may impair the intestinal absorption of oral Alfacalcidol formulations. Alfacalcidol should be administered at least 1 hour before, or 4 to 6 hours after the intake of the bile acid sequestrant in order to minimise the potential risk of interaction.

Pregnancy

There is alimited amount of data from the use of alfacalcidol in pregnant women. Studies in animals have shown reproductive toxicity at high doses (see section 5.3).

Therefore, Alfacalcidol is not recommended during pregnancy and in women of child- bearing potential not using contraception.

Breast-feeding

Although it has not been established, it is likely that increased amounts of 1,25- dihydroxyvitamin D will be found in the milk of lactating mothers treated with Alfacalcidol. This may influence calcium metabolism in the infant.

Breast-fed infants of alfacalcidol-using mothers should be monitored closely for hypercalcaemia.

Fertility

There are no clinical studies on the effect of alfacalcidol on fertility. A pre-clinical study did not show an effect on fertility in rats.

Alfacalcidol has no or negligible direct influence on the ability to drive and use machines. However, the patient suffering from “dizziness” or “confusional states” due to Alfacalcidol should not drive or use machines.

The estimation of the frequency of undesirable effects is based on a pooled analysis of data from clinical studies and spontaneous reporting.

The most frequently reported undesirable effects are skin reactions such as pruritus and rash, hypercalcaemia, gastrointestinal pain/discomfort and hyperphosphataemia. Symptoms of hypercalcaemia are headache, weakness, anorexia, weight loss, nausea, vomiting, diarrhoea, constipation, polyuria, polydepsia, and muscle and bone pain, and metallic taste. Renal failure has been reported post-marketing.

Undesirable effects are listed by MedDRA system organ class (SOC) and the individual undesirable effects are listed starting with the most frequently reported one.

Very common (≥1/10)

Common (≥1/100 to < 1/10)

Uncommon (≥1/1,000 to <1/100)

Rare (≥1/10,000 to <1/1,000)

Very rare (<1/10,000)

Not known (cannot be estimated from the available data)

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

Excessive intake of Alfacalcidol may lead to the development of hypercalcaemia, however, the effect is reversed rapidly on withdrawal.

Symptoms of overdosage of Alfacalcidol strides are anorexia, lassitude, nausea and vomiting, diarrhoea, constipation, weight loss, polyuria, sweating, headache, thirst, vertigo, and raised concentrations of calcium and phosphate in plasma and urine.

In severe cases of hypercalcaemia, general supportive measures should be undertaken. Keep the patient well hydrated by i.v. infusion of saline (force diuresis), measure electrolytes, calcium and renal function indices; assess electrocardiographic abnormalities, especially in patients on digitalis. More specifically, treatment with glucocorticosteroids, loop diuretics, bisphosphonates, calcitonin and eventually haemodialysis with low calcium content should be considered.

Pharmacotherapeutic group: Vitamin D and analogues. ATC code: A11CC03

Clinical efficacy and safety

Impaired 1α-hydroxylation by the kidneys reduces endogenous 1,25-dihydroxyvitamin D production. This contributes to the disturbances in mineral metabolism found in several disorders, including renal bone disease, hypoparathyroidism and vitamin D dependent rickets. These disorders, which require high doses of parent vitamin D for their correction, will respond to small doses of Alfacalcidol.

The delay in response and high dosage required in treating these disorders with parent vitamin D makes dosage adjustment difficult. This can result in unpredictable hypercalcaemia which may take weeks or months to reverse. The major advantage of Alfacalcidol is the more rapid onset of response, which allows a more accurate titration of dosage. Should inadvertent hypercalcaemia occur, it can be reversed within days of stopping treatment.

In patients with renal failure, 1 - 5 microgram/day of 1α- hydroxyvitamin D (1α-OHD3) increased intestinal calcium and phosphorus absorption in a dose-related manner. This effect was observed within 3 days of starting the drug and conversely, it was reversed within 3 days of its discontinuation.

Patients with chronic renal failure have shown increased serum calcium levels within 5 days of receiving 1α-OHD3 in a dose of 0.5- 1.0 microgram/day. As serum calcium rose, PTH levels and alkaline phosphatase decreased toward normal.

In patients with nutritional osteomalacia, increases in calcium absorption were noted within 6 hours of giving 1 µg 1α-OHD3 orally and usually peaked at 24 hours. 1α- OHD3 also produced increases in plasma inorganic phosphorus due to increased intestinal absorption and renal tubular re-absorption. This latter effect is a result of PTH suppression by 1α-OHD3. The effect of the drug on calcium was about double its effect on phosphorus absorption.

Absorption

Alfacalcidol is absorbed passively and almost completely in the small intestine.

Biotransformation

Alfacalcidol is converted rapidly in the liver to 1,25-dihydroxyvitamin D. This is the metabolite of vitamin D which acts as a regulator of calcium and phosphate metabolism. Since this conversion is rapid, the clinical effects of Alfacalcidol and 1,25-dihydroxyvitamin D are very similar.

Pharmacokinetic/pharmacodynamic relationship(s)

The half-life of alfacalcidol is about 4 hours. The pharmacologic effect is 3-5 days.

Chronic toxicity:

The non-clinical toxicity of alfacalcidol is attributed to the known vitamin D-effect of calcitriol on calcium homeostasis, which is characterised by hypercalcaemia, hypercalciuria and eventually soft tissue calcification.

Genotoxicity:

Alfacalcidol is not genotoxic.

Reproduction toxicity:

No specific effects of alfacalcidol on fertility or behaviour of the offspring were noted in rats and rabbits. In terms of embryo-fetal development, fetal toxicity (post-implantation loss, lower litter size and lower pup weight) was observed at doses high enough to cause toxicity in the dams. High doses of vitamin D are known to be teratogenic in experimental animals.

Citric acid, anhydrous

All-rac-α-Tocopherol

Propyl gallate,

Ethanol, anhydrous

Arachis oil, hydrogenated

The capsule shell contains:

Gelatin Glycerol Anidrisorb Purified water

Medium chain triglyceride

Lecithin (soya lecithin)

The capsules contain the following colours:

1.0 microgram capsules: titanium dioxide (E171) and ferric oxide yellow (E172).

Not applicable.

2 years.

This medicinal product does not require any special storage conditions.

The finished products are Alfacalcidol 1.0 mcg capsules soft, to be marketed in white opaque HDPE container, with white opaque HDPE screw closure and induction sealing.

Pack size: 30 capsules, 50 capsules and 100 capsules

Not all pack sizes may be marketed.

No special requirements.