Cinacalcet

Cinacalcet
Clinical data
Trade names Sensipar, Mimpara
AHFS/Drugs.com Monograph
MedlinePlus a605004
License data
Pregnancy
category
  • AU: B3
  • US: C (Risk not ruled out)
    Routes of
    administration    		 By mouth
    ATC code
    Legal status
    Legal status
    • In general: ℞ (Prescription only)
    Pharmacokinetic data
    Bioavailability 20 to 25%
    increases if taken with food
    Protein binding 93 to 97%
    Metabolism Hepatic (CYP3A4-, CYP2D6- and CYP1A2-mediated)
    Elimination half-life 30 to 40 hours
    Excretion Renal (80%) and fecal (15%)
    Identifiers
    CAS Number
    PubChem CID
    IUPHAR/BPS
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEBI
    ChEMBL
    ECHA InfoCard 100.208.116 Edit this at Wikidata
    Chemical and physical data
    Formula C22H22F3N
    Molar mass 357.412 g/mol
    3D model (JSmol)
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    Cinacalcet (INN) is a drug that acts as a calcimimetic (i.e. it mimics the action of calcium on tissues) by allosteric activation of the calcium-sensing receptor that is expressed in various human organ tissues (Van Wagenen et al. (2001), U.S. Pat. 6,211,244). It is sold by Amgen under the trade name Sensipar in North America and Australia and as Mimpara in Europe. Cinacalcet is used to treat secondary hyperparathyroidism (elevated parathyroid hormone levels), a consequence of end-stage renal disease.[1] Cinacalcet is also indicated for the treatment of hypercalcemia in patients with parathyroid carcinoma.[2] Cinacalcet was FDA approved in March 2004,[3] and was the first allosteric G protein-coupled receptor modulator to enter the pharmaceutical market.[4] In 2014, cinacalcet was 76th out of the top 100 drugs in the list of largest selling pharmaceutical products.[5]

    Medical uses

    Cinacalcet is indicated for the treatment of tertiary hyperparathyroidism in people with chronic kidney disease on dialysis and hypercalcemia in people with parathyroid carcinoma.[6] Cinacalcet can also be used to treat severe hypercalcemia in patients with primary hyperparathyroidism who are unable to undergo parathyroidectomy.[7]

    In the treatment of tertiary hyperparathyroidism due to chronic kidney disease on dialysis it does not appear to affect mortality.[8] It does decrease the need for a parathyroidectomy but caused more issues with low blood calcium levels.[8]

    Pregnancy and lactation

    Cinacalcet has pregnancy category C in the US, meaning that adequate and well-controlled studies involving cinacalcet in pregnant women have not been done.[3]

    Studies have not been done in lactating women; therefore it is not known whether cinacalcet is excreted into human milk.[3]

    Contraindications

    Hypocalcemia (decreased calcium levels) is a contraindication of cinacalcet. Patients who have serum calcium levels less than 7.5 mg/dL should not be started on cinacalcet. Hypocalcemia symptoms include parathesias, myalgias, muscle cramping, tetany, and convulsions. Cinacalcet should not be administered until serum calcium levels are above 8.0 mg/dL and/or hypocalcemia symptoms are resolved.[3]

    Adverse effects

    Common side effects of cinacalcet include stomach upset, vomiting, diarrhea, dizziness, nausea, weakness, and chest pain.[7]

    Clinical trials conducted in the United States by Amgen to determine whether the drug is safe in children were halted by the FDA in February 2013 following the death of a 14-year-old patient.[9]

    Overdose

    Serious side effects, including overdose symptoms, of cinacalcet include:[7]

    • burning
    • tingling
    • unusual feelings of the lips, tongue, fingers, or feet
    • muscle aches or cramps
    • sudden tightening of muscles in hands, feet, face, or throat
    • seizures

    Interactions

    Cinacalcet is a strong inhibitor of the liver enzyme CYP2D6 and is partially metabolized by CYP3A4 and CYP1A2. Dose adjustments may be necessary if patients are treated with CYP3A4 and CYP1A2 inhibitors and medications that are metabolized by CYP2D6.[3]

    Pharmacology

    Mechanism of action

    Cinacalcet is a drug that acts as a calcimimetic (i.e. it mimics the action of calcium on tissues) by allosteric activation of the calcium-sensing receptor that is expressed in various human organ tissues. The calcium-sensing receptors on the surface of the chief cell of the parathyroid gland is the principal negative regulator of parathyroid hormone secretion.[10] Cinacalcet increases the sensitivity of calcium receptors on parathyroid cells to reduce parathyroid hormone (PTH) levels and thus decrease serum calcium levels.[6]

    The intravenously administered drug etelcalcetide has the same mechanism of action.[11]

    References

    1. ↑ Torres PU (2006). "Cinacalcet HCl: a novel treatment for tertiary hyperparathyroidism caused by chronic kidney disease". Journal of Renal Nutrition. 16 (3): 253–8. doi:10.1053/j.jrn.2006.04.010. PMID 16825031.
    2. ↑ "Sensipar for Parathyroid Carcinoma". Amgen. 2009. Retrieved 25 September 2009.
    3. 1 2 3 4 5 "Highlights of prescribing information" (PDF). Amgen. Retrieved 29 October 2014.
    4. ↑ Bräuner-Osborne H, Wellendorph P, Jensen AA (2007). "Structure, pharmacology and therapeutic prospects of family C G-protein coupled receptors". Current Drug Targets. 8 (1): 169–84. doi:10.2174/138945007779315614. PMID 17266540.
    5. ↑ Drugs.com U.S. Pharmaceutical Sales - Q4 2013, updated Feb. 2014
    6. 1 2 2014 Nurses Drug Handbook (13th ed.). Burlington, MA: Jones & Bartlett Learning. 2014. pp. 245–6. ISBN 978-1-284-03115-7.
    7. 1 2 3 "Cinacalcet". U.S. National Library of Medicine. Retrieved 29 October 2014.
    8. 1 2 Ballinger, AE; Palmer, SC; Nistor, I; Craig, JC; Strippoli, GF (9 December 2014). "Calcimimetics for tertiary hyperparathyroidism in chronic kidney disease patients". The Cochrane Database of Systematic Reviews. 12: CD006254. doi:10.1002/14651858.CD006254.pub2. PMID 25490118.
    9. ↑ Edney, Anna (February 26, 2013). "Amgen Pediatric Trials of Sensipar Halted by FDA After Death". Businessweek.
    10. ↑ http://www.drugbank.ca/drugs/DB01012
    11. ↑ "Amgen Submits New Drug Application For Novel Intravenous Calcimimetic Etelcalcetide (AMG 416)”
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