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On 23 February 2017, the Committee for Medicinal Products for Human Use (CHMP) adopted a positive opinion, recommending the granting of a conditional1 marketing authorisation for the medicinal product Natpar, intended for the treatment of hypoparathyroidism. Natpar was designated as an orphan medicinal product on 18 December 2013. The applicant for this medicinal product is Shire Pharmaceuticals Ireland Ltd.

Natpar will be available as powder (25, 50, 75 and 100 micrograms) and solvent for solution for injection. The active substance of Natpar is parathyroid hormone (ATC code: H05AA03). Natpar is intended as a replacement therapy for endogenous parathyroid hormone, a principal regulator of calcium and phosphate homeostasis.

The main benefits with Natpar are its ability to reduce the patient’s need for calcium and vitamin D supplements while maintaining serum calcium levels within the desired range and partially improving some parameters of calcium-phosphate metabolism. The most common side effects are hypercalcaemia and hypocalcaemia.

The full indication is: "Natpar is indicated as adjunctive treatment of adult patients with chronic hypoparathyroidism who cannot be adequately controlled with standard therapy alone". It is proposed that Natpar be prescribed by physicians experienced in the treatment of hypoparathyroidism.

Detailed recommendations for the use of this product will be described in the summary of product characteristics (SmPC), which will be published in the European public assessment report (EPAR) and made available in all official European Union languages after the marketing authorisation has been granted by the European Commission.

1 A conditional marketing authorisation is granted to a medicinal product that fulfils an unmet medical need when the benefit to public health of immediate availability outweighs the risk inherent in the fact that additional data are still required. The marketing authorisation holder is likely to provide comprehensive clinical data at a later stage.

Name Language First published Last updated
CHMP summary of positive opinion for Natpar (English only) 2017-02-24  

Key facts

Product details for Natpar
INN or common name

parathyroid hormone

Therapeutic area Hypoparathyroidism
Active substance

parathyroid hormone

Date opinion adopted23/02/2017
Company name

Shire Pharmaceuticals Ireland Ltd.

Application typeInitial authorisation