Hectorol Dosage

Generic name: doxercalciferol
Dosage form: capsule, liquid filled

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The information at Drugs.com is not a substitute for medical advice. ALWAYS consult your doctor or pharmacist.

Adult Administration:

The optimal dose of Hectorol must be carefully determined for each patient.  Table 4 provides the current recommended therapeutic target levels for iPTH in patients with chronic kidney disease:

Table 4: Target Range of Intact Plasma PTH by Stage of CKD
CKD Stage
GFR
(mL/min/1.73m2)
Target “intact” PTH
(pg/mL)

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)

3 30-59 35-70
4 15-29 70-110
5 < 15 (or dialysis) 150-300

Dialysis:

The recommended initial dose of Hectorol is 10 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:

Table 5: Dialysis Dosing Recommendations
Initial Dosing

iPTH Level

Hectorol® Dose

> 400 pg/mL

10 mcg three times per week at dialysis

Dose Titration

iPTH Level

Hectorol® Dose

Above 300 pg/mL

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 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.  Table 6 presents a suggested approach in dose titration:

Table 6: Pre-dialysis Dosing Recommendations
Initial Dosing

iPTH Level

Hectorol® Dose

> 70 pg/mL (Stage 3)

1 mcg once per day

> 110 pg/mL (Stage 4)

Dose Titration

iPTH Level

Hectorol® Dose

Above 70 pg/mL (Stage 3)

Increase by 0.5 mcg at two-week intervals as necessary

110 pg/mL (Stage 4)

35 - 70 pg/mL (Stage 3)

Maintain

70 - 110 pg/mL (Stage 4)

< 35 pg/mL (Stage 3)

Suspend for one week, then resume at a dose that is at least 0.5 mcg lower

< 70 pg/mL (Stage 4)

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