Brand Name: Hectorol® Active Ingredient: doxercalciferol
Strength(s): 0.5mcg and 2.5 mcg capsules; 2mcg and 4 mcg/ampule
Dosage Form(s): Capsules & Intravenous injection
Company Name: Bone Care International Availability: Prescription only
*Date Approved by the FDA: June 9, 1999
Hectorol is used to lower high parathyroid hormone (iPTH) levels in patients with Stage 5 chronic kidney disease on dialysis
Hectorol capsules are also used to lower high parathyroid hormone in patients with Stage 3 or Stage 4 chronic kidney disease who are not on dialysis.
Who should not be treated with Hectorol?
People with a high level of calcium in the blood.
People with signs of extremely high levels of vitamin D.
Special Warnings with Hectorol:
Periodic monitoring of your condition by your doctor is important while being treated with Hectorol.
Because Hectorol affects the absorption of calcium be the body, it is important for you and your doctor to be aware of the early symptoms of too much calcium in your blood, including weakness, headache, excessive sleepiness, nausea, vomiting, dry mouth, constipation, muscle pain, bone pain and metal taste in your mouth. If you have these symptoms, contact your doctor right away. Later symptoms include frequent need to urinate, loss of appetite, weight loss, pink eye, sensitivity to sunlight, nasal discharge, skin itching, and fever.
General Precautions with Hectorol:
Do not take Hectorol with magnesium containing antacids, because these may cause too much magnesium to build up in your body.
Do not take Hectorol with mineral oil or cholesterol-lowering drugs containing cholestyramine, because these may reduce the amount of Hectorol absorbed by your body.
What should I tell my doctor or health care provider?
Because certain other medications can interact with Hectorol, review all medications that you are taking with your health care provider, including those that you take without a prescription.
Tell your health care provider if you are trying to become pregnant, are already pregnant, or are breast-feeding.
What are some possible side effects of Hectorol? (This is NOT a complete list of side effects reported with Hectorol. Your health care provider can discuss with you a more complete list of side effects.)
Side effects of Hectorol are, in general, similar to those of high blood calcium associated with too much vitamin D intake. Some side effects are:
Swelling
Headache
Generally not feeling well
Shortness of breath
Joint pain
Weight gain
For more detailed information about Hectorol, ask your health care provider.
HECTOROL CAPSULES
(doxercalciferol)
DESCRIPTION
Doxercalciferol, the active ingredient in Hectorol, is a synthetic vitamin D2 analog that undergoes metabolic activation in vivo to form 1α,25-dihydroxyvitamin D2 (1α,25-(OH)2D2), a naturally occurring, biologically active form of vitamin D2. Hectorol is available as soft gelatin capsules containing 0.5 mcg or 2.5 mcg doxercalciferol. Each capsule also contains fractionated triglyceride of coconut oil, ethanol, and butylated hydroxyanisole (BHA). The capsule shells contain gelatin, glycerin, titanium dioxide, and D&C Yellow No. 10 with or without FD&C Red No. 40.
Doxercalciferol is a colorless crystalline compound with a calculated molecular weight of 412.66 and a molecular formula of C28H44O2. It is soluble in oils and organic solvents, but is relatively insoluble in water. Chemically, doxercalciferol is (1α,3β,5Z,7E,22E)-9,10-secoergosta-5,7,10(19),22-tetraene-1,3-diol and has the following structural formula:
CH3CH3CH3H3CHHCH2CH3HHHHOHHOH
Other names frequently used for doxercalciferol are 1α-hydroxyvitamin D2, 1α-OH-D2, and 1α-hydroxyergocalciferol.
CLINICAL PHARMACOLOGY
Vitamin D levels in humans depend on two sources: (1) exposure to the ultraviolet rays of the sun for conversion of 7-dehydrocholesterol in the skin to vitamin D3 (cholecalciferol) and (2) dietary intake of either vitamin D2 (ergocalciferol) or vitamin D3. Vitamin D2 and vitamin D3 must be metabolically activated in the liver and the kidney before becoming fully active on target tissues. The initial step in the activation process is the introduction of a hydroxyl group in the side chain at C-25 by the hepatic enzyme, CYP 27 (a vitamin D-25-hydroxylase). The products of this reaction are 25-(OH)D2 and 25-(OH)D3, respectively. Further hydroxylation of these metabolites occurs in the mitochondria of kidney tissue, catalyzed by renal 25-hydroxyvitamin
D-1-α-hydroxylase to produce 1α,25-(OH)2D2, the primary biologically active form of vitamin D2, and 1α,25-(OH)2D3 (calcitriol), the biologically active form of vitamin D3.
Mechanism of Action
Calcitriol (1α,25-(OH)2D3) and 1α,25-(OH)2D2 regulate blood calcium at levels required for essential body functions. Specifically, the biologically active vitamin D metabolites control the intestinal absorption of dietary calcium, the tubular reabsorption of calcium by the kidney and, in conjunction with parathyroid hormone (PTH), the mobilization of calcium from the skeleton. They act directly on bone cells (osteoblasts) to stimulate skeletal growth, and on the parathyroid glands to suppress PTH synthesis and secretion. These functions are mediated by the interaction of these biologically active metabolites with specific receptor proteins in the various target tissues. In patients with chronic kidney disease (CKD), deficient production of biologically active vitamin D metabolites (due to lack of or insufficient 25-hydroxyvitamin D-1-alpha-hydroxylase activity) leads to secondary hyperparathyroidism, which contributes to the development of metabolic bone disease.
Pharmacokinetics and Metabolism
Doxercalciferol is absorbed from the gastrointestinal tract and activated by CYP 27 in the liver to form 1α,25-(OH)2D2 (major metabolite) and 1α,24-dihydroxyvitamin D2 (minor metabolite). Activation of doxercalciferol does not require the involvement of the kidneys.
In healthy volunteers, peak blood levels of 1α,25-(OH)2D2, the major metabolite of doxercalciferol, are attained at 11-12 hours after repeated oral doses of 5 to 15 mcg of Hectorol and the mean elimination half-life of 1α,25-(OH)2D2 is approximately 32 to 37 hours with a range of up to 96 hours. The mean elimination half-life in patients with end-stage renal disease (ESRD) on dialysis appears to be similar. Hemodialysis causes a temporary increase in 1α,25-(OH)2D2 mean concentrations, presumably due to volume contraction. 1α,25-(OH)2D2 is not removed from blood during hemodialysis.
Clinical Studies
Dialysis: The safety and effectiveness of Hectorol were evaluated in two double-blind, placebo-controlled, multicentered clinical studies (Study A and Study B) in a total of 138 patients with chronic kidney disease on hemodialysis (Stage 5 CKD). Patients in Study A were an average age of 52 years (range: 22-75), were 55% male, and were 58% African-American, 31% Caucasian, and 11% Hispanic, and had been on hemodialysis for an average of 53 months. Patients in Study B were an average of 52 years (range: 27-75), were 45% male, and 99% African-American, and 1% Caucasian, and had been on hemodialysis for an average of 56 months. After randomization to two groups, eligible patients underwent an 8-week washout period during which no vitamin D derivatives were administered to either group. Subsequently, all patients received Hectorol in an open-label fashion for 16 weeks followed by a double-blind period of 8 weeks during which patients received either Hectorol or placebo. The initial dose of Hectorol during the open-label phase was 10 micrograms after each dialysis session (3 times weekly) for a total of 30 mcg per
week. The dosage of Hectorol was adjusted as necessary by the investigator in an attempt to achieve intact parathyroid hormone (iPTH) levels within a targeted range of 150 to 300 pg/mL. The maximum dosage was limited to 20 mcg after each dialysis session (60 mcg/week). If at any time during the trial iPTH fell below 150 pg/mL, Hectorol was immediately suspended and restarted at a lower dosage the following week.
Results:
One hundred and six of the 138 patients who were treated with Hectorol during the 16-week open-label phase achieved iPTH levels ≤ 300 pg/mL. Ninety-four of these patients exhibited plasma iPTH levels ≤ 300 pg/mL on at least 3 occasions. Eighty-seven patients had plasma iPTH levels < 150 pg/mL on at least one occasion during the open-label phase of study participation.
Mean weekly doses during the 16-week open-label period in Study A ranged from 14.8 mcg to 28.7 mcg. In Study B, the mean weekly doses during the 16-week open-label period ranged from 19.2 mcg to 28.0 mcg.
Decreases in plasma iPTH from baseline values were calculated, using, as baseline, the average of the last 3 values obtained during the 8-week washout phase and are displayed in the table below.
iPTH (pg/mL)
means ± s.d. (n*)
p Value v. Baseline
p Value v. Placebo
Hectorol
Placebo
Study A
Baseline
797.2 ± 443.8 (30)
n.a.
0.97
847.1 ± 765.5 (32)
Week 16 (open-label)
384.3 ± 397.8 (24)
< .001
0.72
526.5 ± 872.2 (29)
< .001
Week 24 (double-blind)
404.4 ± 262.9 (21)
< .001
0.008
672.6 ± 356.9 (24)
0.70
Study B
Baseline
973.9 ± 567.0 (41)
n.a.
0.81
990.4 ± 488.3 (35)
Week 16 (open-label)
476.1 ± 444.5 (37)
< .001
0.91
485.9 ± 443.4 (32)
< .001
Week 24 (double-blind)
459.8 ± 443.0 (35)
< .001
< .001
871.9 ± 623.6 (30)
< .065
* all subjects; last value carried to discontinuation
In both studies, iPTH levels increased progressively and significantly in 65.9% of the patients during the 8-week washout (control) period during which no vitamin D derivatives were administered. In contrast, Hectorol treatment resulted in a statistically significant reduction from baseline in mean iPTH levels during the 16-week open-label treatment period in more than 93.5% of the 138 treated patients. During the double-blind period (weeks 17 to 24), the reduction in mean iPTH levels was maintained in the Hectorol treatment group compared to a return to near baseline in the placebo group.
In the clinical trials, the values for iPTH varied widely from patient to patient and from week to week for individual patients. The following table shows the numbers of patients within each group who achieved and maintained iPTH levels below 300 pg/mL during the open-label and double-blind phases. Seventy-four of 138 patients (53.6%) had plasma iPTH levels within the target range (150-300 pg/mL) during Weeks 14-16.
Number of times iPTH ≤ 300 pg/mL
1
2
≥ 3
Hectorol
Placebo
Hectorol
Placebo
Hectorol
Placebo
Study A
Weeks 1 – 16 (open-label)
2/30
2/32
0/30
0/32
22/30
23/32
Weeks 17 – 24 (double-blind)
0/24
9/29
3/24
1/29
17/24
5/29
Study B
Weeks 1 – 16 (open-label)
2/41
4/35
1/41
0/35
29/41
21/35
Weeks 17 – 24 (double-blind)
2/37
6/32
1/37
4/32
26/37
4/32
During the 8-week double-blind phase, more patients achieved and maintained the target range of values for iPTH with Hectorol than with placebo.
Pre-dialysis: The safety and effectiveness of Hectorol were evaluated in two clinical studies in 55 patients with Stage 3 or Stage 4 chronic kidney disease. Eighty-two percent of the patients were male, the average age was 64.6 years, 51% were Caucasian, 40% African-American, and the average serum iPTH level at baseline was 194.6 pg/ml. While levels of 25-(OH) vitamin D were not evaluated at baseline, retrospective assessments of stored serum revealed that the mean + SD serum 25-(OH) vitamin D was 18.5 + 8.1 ng/mL (range: <5 to 54 ng/mL) in the study population.
After randomization to two groups, eligible patients underwent an 8-week washout period during which no vitamin D derivatives were administered to either group. Subsequently, one group received Hectorol and the other placebo during a double-blind period of 24 weeks. The initial dose of Hectorol was 1.0 mcg per day. The dosage of Hectorol was adjusted as necessary by the investigator in order to reduce intact parathyroid hormone (iPTH) levels to a target of ≥30% below post-washout baseline. The maximum dosage was limited to 3.5 mcg per day. If at any
time during the trial iPTH fell below 15 pg/mL, Hectorol was immediately suspended and restarted at a lower dosage the following week.
Results:
Decreases in the mean plasma iPTH from baseline values were calculated using as baseline the average of the last 2 values obtained during the 8-week washout phase. In analyses of pooled data from the two studies, iPTH levels decreased from baseline by an average of 101.4 pg/mL in the Hectorol group and by 4.4 pg/mL in the placebo group (p<0.001). Greater reductions of iPTH with Hectorol compared to placebo were observed in each study. Twenty (74%) of 27 subjects in the Hectorol group achieved mean plasma iPTH suppression of ≥30% from baseline for the last four weeks of treatment; whereas two (7%) of the 28 subjects treated with placebo achieved this level of iPTH suppression. In the Hectorol-treated patients, the reductions in plasma iPTH were associated with a reduction in serum bone-specific alkaline phosphatase.
INDICATIONS AND USAGE
Dialysis Patients: Hectorol is indicated for the treatment of secondary hyperparathyroidism in patients with chronic kidney disease on dialysis.
Pre-Dialysis Patients: Hectorol is indicated for the treatment of secondary hyperparathyroidism in patients with Stage 3 or Stage 4 chronic kidney disease.
CONTRAINDICATIONS
Hectorol should not be given to patients with a tendency towards hypercalcemia or evidence of vitamin D toxicity.
WARNINGS
Overdosage of any form of vitamin D, including Hectorol, is dangerous (see OVERDOSAGE). Progressive hypercalcemia due to overdosage of vitamin D and its metabolites may be so severe as to require emergency attention. Acute hypercalcemia may exacerbate tendencies for cardiac arrhythmias and seizures and may potentiate the action of digitalis drugs. Chronic hypercalcemia can lead to generalized vascular calcification and other soft-tissue calcification. The serum calcium times serum phosphorus (Ca X P) product should be maintained at <55 mg2/dL2 in patients with chronic kidney disease. Radiographic evaluation of suspect anatomical regions may be useful in the early detection of this condition.
Since doxercalciferol is a precursor for 1α,25-(OH)2D2, a potent metabolite of vitamin D2, pharmacologic doses of vitamin D and its derivatives should be withheld during Hectorol treatment to avoid possible additive effects and hypercalcemia.
Oral calcium-based or other non-aluminum-containing phosphate binders and a low phosphate diet should be used to control serum phosphorus levels in patients with chronic kidney disease. Uncontrolled serum phosphorus exacerbates secondary hyperparathyroidism and can lessen the
effectiveness of Hectorol in reducing blood PTH levels. If hypercalcemia occurs after initiating Hectorol therapy, the dose of Hectorol and/or calcium containing-phosphate binders should be decreased. If hyperphosphatemia occurs after initiating Hectorol, the dose of Hectorol should be decreased and/or the dose of phosphate binders increased. (See dosing recommendations for Hectorol under DOSAGE AND ADMINISTRATION section.)
Magnesium-containing antacids and Hectorol should not be used concomitantly in patients on chronic renal dialysis because such use may lead to the development of hypermagnesemia.
PRECAUTIONS
General
Active vitamin D sterols should not be used as initial treatment of nutritional vitamin D deficiency (as defined by low 25-hydroxy vitamin D). Patients should be checked and treated for nutritional vitamin D deficiency prior to initiating treatment with Hectorol.
The principal adverse effects of treatment with Hectorol are hypercalcemia, hyperphosphatemia, hypercalciuria, and oversuppression of iPTH. Prolonged hypercalcemia can lead to calcification of soft tissues, including the heart and arteries, and hyperphosphatemia can exacerbate hyperparathyroidism. Hypercalciuria can accelerate the onset of renal failure through nephrocalcinosis. Oversuppression of iPTH may lead to adynamic bone syndrome. All of these potential adverse effects should be managed by regular patient monitoring and appropriate dosage adjustments. During treatment with Hectorol, patients usually require dose titration, as well as adjustment in co-therapy (i.e., dietary phosphate binders) in order to effect and sustain PTH suppression while maintaining serum calcium and phosphorus within prescribed ranges.
Dialysis: In four adequate and well-controlled studies, the incidence of hypercalcemia and hyperphosphatemia increased during therapy with Hectorol. The observed increases during Hectorol treatment, although occurring at a low rate, underscore the importance of regular safety monitoring of serum calcium and phosphorus levels throughout treatment. Patients with higher pre-treatment serum levels of calcium (>10.5 mg/dL) or phosphorus (>6.9 mg/dL) were more likely to experience hypercalcemia or hyperphosphatemia. Therefore, Hectorol should not be given to patients with a recent history of hypercalcemia or hyperphosphatemia, or evidence of vitamin D toxicity.
Pre-dialysis: In two clinical studies, the incidences of hypercalcemia and hyperphosphatemia during therapy with Hectorol were similar to placebo therapy, and no episodes of hypercalciuria were observed. The baseline median 25-(OH) vitamin D levels of patients enrolled in these studies was 17.2 ng/mL. Ninety-three percent of patients had 25-(OH) vitamin D levels less than 30 ng/mL (26% had 25-(OH) vitamin D levels >20 to <30 ng/mL; 58% had levels >10 to <20 ng/mL; and 7% had levels >5 to <10 ng/mL and 2% had levels <5 ng/mL). The incidences of hypercalcemia, hyperphosphatemia, and hypercalciuria in patients treated with Hectorol for hyperparathyroidism related to pre-dialysis renal insufficiency has not been fully studied when 25-OH vitamin D levels are greater than or equal to 30 ng/mL.
Information for the Patient
The patient, spouse, or guardian should be informed about compliance with dosage instructions, adherence to instructions about diet, calcium supplementation, and avoidance of the use of nonprescription drugs without prior approval from their physician. Patients should also be carefully informed about the symptoms of hypercalcemia (see ADVERSE REACTIONS section).
Patients should have a combined (dietary and calcium based phosphate binder) daily intake of 1.5 to 2 gm.
Laboratory Tests
Serum or plasma iPTH and serum calcium, phosphorus, and alkaline phosphatase should be determined periodically. In the early phase of treatment for dialysis patients, iPTH, serum calcium, and serum phosphorus should be determined prior to initiation of Hectorol® treatment and weekly thereafter. For pre-dialysis patients, serum levels of calcium and phosphorus and plasma levels of iPTH should be monitored at least every two weeks for 3 months after initiation of Hectorol therapy or following dose-adjustments in Hectorol therapy, then monthly for 3 months, and every 3 months thereafter.
Drug Interactions
Specific drug interaction studies have not been conducted. Cholestyramine has been reported to reduce intestinal absorption of fat-soluble vitamins; therefore, it may impair intestinal absorption of doxercalciferol. Magnesium-containing antacids and Hectorol should not be used concomitantly, because such use may lead to the development of hypermagnesemia (see WARNINGS). The use of mineral oil or other substances that may affect absorption of fat may influence the absorption and availability of Hectorol. Although not examined specifically, both enzyme inducers (such as glutethimide and phenobarbital) may affect the 25-hydroxylation of Hectorol and may necessitate dosage adjustments.
Carcinogenesis, Mutagenesis, Impairment of Fertility
Long-term studies in animals to evaluate the carcinogenic potential of doxercalciferol have not been conducted. No evidence of genetic toxicity was observed in an in vitro bacterial mutagenicity assay (Ames test) or a mouse lymphoma gene mutation assay. Doxercalciferol caused structural chromatid and chromosome aberrations in an in vitro human lymphocyte clastogenicity assay with metabolic activation. However, doxercalciferol was negative in an in vivo mouse micronucleus clastogenicity assay. Doxercalciferol had no effect on male or female fertility in rats at oral doses up to 2.5 mcg/kg/day (approximately 3 times the maximum recommended human dose of 60 mcg/week based on mcg/m2 body surface area).
Use in Pregnancy
Pregnancy Category B
Reproduction studies in rats and rabbits, at doses up to 20 mcg/kg/day and 0.1 mcg/kg/day (approximately 25 times and less than the maximum recommended human dose of 60 mcg/week based on mcg/m2 body surface area, respectively) have revealed no teratogenic or fetotoxic effects due to doxercalciferol. There are, however, no adequate and well-controlled studies in
pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
Nursing Mothers
It is not known whether doxercalciferol is excreted in human milk. Because other vitamin D derivatives are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from doxercalciferol, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Pediatric Use
Safety and efficacy of Hectorol in pediatric patients have not been established.
Geriatric Use
Of the 138 patients treated with Hectorol Capsules in two Phase 3 clinical studies, 30 patients were 65 years or over. In these studies, no overall differences in efficacy or safety were observed between patients 65 years or older and younger patients.
Hepatic Insufficiency
Since patients with hepatic insufficiency may not metabolize Hectorol appropriately, the drug should be used with caution in patients with impaired hepatic function. More frequent monitoring of iPTH, calcium, and phosphorus levels should be done in such individuals.
ADVERSE REACTIONS
Dialysis: Hectorol has been evaluated for safety in clinical studies in 165 patients with chronic kidney disease on hemodialysis. In two placebo-controlled, double-blind, multicenter studies, discontinuation of therapy due to any adverse event occurred in 2.9% of 138 patients treated with Hectorol for four to six months (dosage titrated to achieve target iPTH levels, see CLINICAL PHARMACOLOGY/Clinical Studies) and in 3.3% of 61 patients treated with placebo for two months. Adverse events occurring in the Hectorol group at a frequency of 2% or greater and more frequently than in the placebo group are presented in the following table:
Adverse Events Reported by ≥2% of Hectorol Treated Patients and More Frequently Than Placebo During the Double-blind Phase of Two Clinical Studies
Adverse Event
Hectorol (n=61)
%
Placebo (n=61)
%
Body as a Whole
Abscess
Headache
Malaise
3.3
27.9
27.9
0.0
18.0
19.7
Cardiovascular System
Bradycardia
6.6
4.9
Digestive System
Anorexia
Constipation
4.9
3.3
3.3
3.3
Dyspepsia
Nausea/Vomiting
4.9
21.3
1.6
19.7
Musculo-Skeletal System
Arthralgia
4.9
0.0
Metabolic and Nutritional
Edema
Weight increase
34.4
4.9
21.3
0.0
Nervous System
Dizziness
Sleep disorder
11.5
3.3
9.8
0.0
Respiratory System
Dyspnea
11.5
6.6
Skin
Pruritus
8.2
6.6
A patient who reported the same medical term more than once was counted only once for that medical term.
Predialysis: Hectorol has been evaluated for safety in clinical studies in 55 patients (27 active and 28 placebo) with chronic kidney disease, Stages 3 or 4. In two placebo-controlled, double-blind, multicenter studies, discontinuation of therapy due to any adverse event occurred in one (3.7%) of 27 patients treated with Hectorol for 24 weeks (dosage titrated to achieve target iPTH levels, see CLINICAL PHARMACOLOGY/Clinical Studies) and in three (10.7%) of 28 patients treated with placebo for 24 weeks. Adverse events occurring in the Hectorol group at a frequency of 5% or greater and more frequently than in the placebo group are as follows: Body as a Whole – Infection, Pain chest; Digestive System – Constipation, Dyspepsia; Hematologic and Lymphatic – Anemia; Metabolic and Nutritional – Dehydration; Nervous System – Depression, Hypertonia, Insomnia, Paresthesia; Respiratory System – Cough increased, Dyspnea, Rhinitis.
Potential adverse effects of Hectorol are, in general, similar to those encountered with excessive vitamin D intake. The early and late signs and symptoms of vitamin D intoxication associated with hypercalcemia include:
Early
Weakness, headache, somnolence, nausea, vomiting, dry mouth, constipation, muscle pain, bone pain, metallic taste, and anorexia.
Late
Polyuria, polydipsia, anorexia, weight loss, nocturia, conjunctivitis (calcific), pancreatitis, photophobia, rhinorrhea, pruritus, hyperthermia, decreased libido, elevated blood urea nitrogen (BUN), albuminuria, hypercholesterolemia, elevated serum aspartate transaminase (AST) and alanine transaminase (ALT), ectopic calcification, hypertension, cardiac arrhythmias, sensory disturbances, dehydration, apathy, arrested growth, urinary tract infections, and, rarely, overt psychosis.
OVERDOSAGE
Administration of Hectorol to patients in excess doses can cause hypercalcemia, hypercalciuria, hyperphosphatemia, and oversuppression of PTH secretion leading in certain cases to adynamic bone disease. High intake of calcium and phosphate concomitant with Hectorol may lead to similar abnormalities. High levels of calcium in the dialysate bath may contribute to hypercalcemia.
Treatment of Hypercalcemia and Overdosage
General treatment of hypercalcemia (greater than 1 mg/dL above the upper limit of the normal range in dialysis patients; >10.7 mg/dL in pre-dialysis patients) consists of immediate suspension of Hectorol therapy, institution of a low calcium diet, and withdrawal of calcium supplements. Serum calcium levels should be determined at least weekly until normocalcemia ensues. Hypercalcemia usually resolves in 2 to 7 days. When serum calcium levels have returned to within normal limits, Hectorol therapy may be reinstituted at a dose that is lower (at least 2.5 mcg in dialysis patients and 0.5 mcg in pre-dialysis patients) than prior therapy. In dialysis patients, serum calcium levels should be obtained weekly after all dosage changes and during subsequent dosage titration. Persistent or markedly elevated serum calcium levels may be corrected by dialysis against a reduced calcium or calcium-free dialysate.
Treatment of Accidental Overdosage of Doxercalciferol
The treatment of acute accidental overdosage of Hectorol should consist of general supportive measures. If drug ingestion is discovered within a relatively short time (10 minutes), induction of emesis or gastric lavage may be of benefit in preventing further absorption. If drug ingestion is discovered later than 10 minutes post-ingestion, the administration of mineral oil may promote its fecal elimination. Serial serum electrolyte determinations (especially calcium), rate of urinary calcium excretion, and assessment of electrocardiographic abnormalities due to hypercalcemia should be obtained. Such monitoring is critical in patients receiving digitalis. Discontinuation of supplemental calcium and institution of a low calcium diet are also indicated in accidental overdosage. If persistent and markedly elevated serum calcium levels occur, there are a variety of therapeutic alternatives that may be considered. These include the use of drugs such as phosphates and corticosteroids as well as measures to induce diuresis. Also, one may consider dialysis against a calcium-free dialysate.
DOSAGE AND ADMINISTRATION
Adult Administration:
The optimal dose of Hectorol must be carefully determined for each patient. The following table provides the current recommended therapeutic target levels for iPTH in patients with chronic kidney disease:
Target Range of Intact Plasma PTH by Stage of CKD
CKD Stage
GFR
(mL/min/1.73 m2)
Target “intact” PTH
(pg/mL)
3
30 – 59
35 – 70
4
15 – 29
70 – 110
5
< 15 (or dialysis)
150 – 300
From Table 15 of National Kidney Foundation. K/DOQI Clinical Practice Guidelines for Bone Metabolism and Disease in Chronic Kidney Disease. Am J Kidney Dis 42:S1-S202, 2003 (suppl 3)
Dialysis: The recommended initial dose of Hectorol is 10.0 mcg administered three times weekly at dialysis (approximately every other day). The initial dose should be adjusted, as needed, in order to lower blood iPTH into the range of 150 to 300 pg/mL. The dose may be increased at 8-week intervals by 2.5 mcg if iPTH is not lowered by 50% and fails to reach the target range. The maximum recommended dose of Hectorol is 20 mcg administered three times a week at dialysis for a total of 60 mcg per week. Drug administration should be suspended if iPTH falls below 100 pg/mL and restarted one week later at a dose that is at least 2.5 mcg lower than the last administered dose. During titration, iPTH, serum calcium, and serum phosphorus levels should be obtained weekly. If hypercalcemia, hyperphosphatemia, or a serum calcium times serum phosphorus product greater than 55 mg2/dL2 is noted, the dose of Hectorol should be decreased or suspended and/or the dose of phosphate binders should be appropriately adjusted. If suspended, the drug should be restarted at a dose that is at least 2.5 mcg lower.
Dosing must be individualized and based on iPTH levels with monitoring of serum calcium and serum phosphorus levels. The following is a suggested approach in dose titration:
Initial Dosing
iPTH Level
> 400 pg/mL
Hectorol Dose
10.0 mcg three times per week at dialysis
Dose Titration
iPTH Level
Above 300 pg/mL
Hectorol Dose
Increase by 2.5 mcg at eight-week intervals as necessary
150-300 pg/mL
Maintain
< 100 pg/mL
Suspend for one week, then resume at a dose that is at least 2.5 mcg lower
Pre-dialysis: The recommended initial dose of Hectorol is 1.0 mcg administered once daily. The initial dose should be adjusted, as needed, in order to lower blood iPTH to within target ranges (see table below). The dose may be increased at 2-week intervals by 0.5 mcg to achieve the target range of iPTH. The maximum recommended dose of Hectorol is 3.5 mcg administered once per day.
Serum levels of calcium and phosphorus and plasma levels of iPTH should be monitored at least every two weeks for 3 months after initiation of Hectorol therapy or following dose-adjustments in Hectorol therapy, then monthly for 3 months, and every 3 months thereafter. If hypercalcemia, hyperphosphatemia, or a serum calcium times phosphorus product greater than 55 mg2/dL2 is noted, the dose of Hectorol should be decreased or suspended and/or the dose of phosphate binders should be appropriately adjusted. If suspended, the drug should be restarted at a dose that is at least 0.5 mcg lower.
Dosing must be individualized and based on iPTH levels with monitoring of serum calcium and serum phosphorus levels. The following is a suggested approach in dose titration:
Initial Dosing
iPTH Level
> 70 pg/mL (Stage 3)
> 110 pg/mL (Stage 4)
Hectorol Dose
1.0 mcg once per day
Dose Titration
iPTH Level
Above 70 pg/mL (Stage 3)
110 pg/mL (Stage 4)
Hectorol Dose
Increase by 0.5 mcg at two-week intervals as necessary
35 – 70 pg/mL (Stage 3)
70 – 110 pg/mL (Stage 4)
Maintain
< 35 pg/mL (Stage 3)
< 70 pg/mL (Stage 4)
Suspend for one week, then resume at a dose that is at least 0.5 mcg lower
HOW SUPPLIED
NDC 64894-825-50
NDC 64894-805-50
2.5 mcg doxercalciferol in soft gelatin, sunshine yellow, oval capsules, imprinted BCI; bottles of 50.
0.5 mcg doxercalciferol in soft gelatin, citrus orange, oval capsules, imprinted BCI; bottles of 50.
Store at controlled room temperature 20° to 25°C (68° to 77°F) [see USP].
Manufactured by Cardinal Health 409, Inc. for
Bone Care International, Inc., Middleton, WI 53562 888-389-4242
2000 Bone Care International, Inc.
PI-001-02 04/04
© 2007 Directory of Drugs - reference guide to drugs - All rights reserved - Legal Notice