Generic Name and Formulations:
Parathyroid hormone (recombinant) 25mcg, 50mcg, 75mcg, 100mcg; lyophilized pwd for SC inj after reconstitution.
Shire US, Inc.
Indications for NATPARA:
Adjunct to calcium and vitamin D to control hypocalcemia in hypoparathyroidism.
Limitations Of use:
Use only for patients uncontrolled on calcium supplements and active vitamin D alone. Not studied in hypoparathyroidism caused by calcium-sensing receptor mutations or in acute post-surgical hypoparathyroidism.
Individualize based on total serum calcium (albumin-corrected) and 24hr urinary calcium excretion. Give as SC inj in the thigh (alternate thigh daily). Initially 50mcg once daily; may increase in increments of 25mcg every 4 weeks up to max 100mcg daily, if serum calcium is not maintained >8mg/dL. May decrease to 25mcg daily if serum calcium repeatedly >9mg/dL. If currently receiving active vitamin D: decrease vitamin D dose by 50% if serum calcium >7.5mg/dL. Maintenance: use lowest dose to achieve total serum calcium within the lower half of the normal range (approx. 8–9mg/dL). See full labeling.
<18yrs: not established.
Confirm sufficient 25-hydroxyvitamin D stores and serum calcium >7.5mg/dL prior to initiation. Avoid in those with increased baseline risk of osteosarcoma (eg, Paget's disease of bone, unexplained elevations of alkaline phosphatase, pediatric and young adults with open epiphyses, hereditary disorders predisposing to osteosarcoma, history of external beam or implant radiation therapy involving the skeleton). Measure calcium concentration every 3–7 days after starting therapy and when adjusting Natpara, active vitamin D, or calcium supplement doses; consider holding and/or reducing dose if severe hypercalcemia occurs. Renal impairment. Elderly. Pregnancy (Cat.C). Nursing mothers: not recommended.
Concomitant alendronate: not recommended. Concomitant digoxin: monitor serum calcium and digoxin levels and for digitalis toxicity; adjustments may be needed for both drugs.
Paresthesia, hypocalcemia, headache, hypercalcemia, nausea, hypoaesthesia, diarrhea, vomiting, arthralgia, hypercalciuria, pain in extremity; possibly osteosarcoma.
Multi-dose cartridges (dual-chamber)—2
Endocrinology Advisor Articles
- Update on Vitamin D and Calcium Supplements for Reducing Fracture Risk
- AAP Shares List of 5 Unnecessary Pediatric Tests and Procedures
- Severe Hypoglycemia Associated With Increased Mortality Risk in T2D
- Efficacy of CGM in Preterm Infants of Mothers With Diabetes
- SSRIs and SNRIs Linked to Type 2 Diabetes in Children, Adolescents
- High Grip Strength Associated With Lower Risk for Diabetes-Related AEs
- Statin Use for CVD Prevention Increases Diabetes Risk in Overweight Patients
- Optimal Timing of Gastric Bypass and Cholecystectomy When Both Procedures Clinically Indicated
- Does Asthma Contribute to Infertility?
- Short-Term Probiotics Increase Weight Loss in Overweight, Obesity