Hu·ma·trope (h  m -tr p ) A trademark for the drug somatropin. |
Humatrope,
somatropin, recombinant
Genotropin, Humatrope, Norditropin, Nutropin AQ, Nutropin AQ Pen, Nutropin Depot, Saizen, Serostim, Tev-Tropin, Zomacton (UK), Zorbtive
Pharmacologic class: Posterior pituitary hormone
Therapeutic class: Growth hormone (GH)
Pregnancy risk category B (Genotropin, Saizen, Serostim), C
Action
Stimulates linear and skeletal growth, increases number and size of muscle cells, and influences internal organ size
Availability
Genotropin injection: 1.5 mg (about 4 international units/vial), 5.8 mg (about 15 international units/vial), 13.8 mg (about 41.4 international units/vial)
Humatrope injection: 2 mg (about 6 international units/vial), 5 mg (about 15 international units/vial), 6 mg (about 18 international units/vial), 12 mg (about 36 international units/vial), 24 mg (about 72 international units/vial)
Norditropin injection: 4 mg (12 international units/vial), 8 mg (24 international units/vial)
Norditropin injection cartridge: 5 mg/1.5 ml, 10 mg/1.5 ml, 15 mg/1.5 ml
Nutropin AQ injection: 10 mg
Nutropin AQ Pen injection cartridge: 10 mg
Nutropin Depot: 13.5-mg, 18-mg, and 22.5-mg single-use vials; 13.5-mg, 18-mg, and 22.5-mg kits
Nutropin injection: 5 mg (about 15 international units/vial), 10 mg (about 30 international units/vial)
Saizem injection: 5 g (about 15 international units/vial)
Serostim injection: 5 mg (about 15 international units/vial), 6 mg (about 18 international units/vial)
Tev-Tropin injection: 5 mg
Zorbtive injection: 8.8 mg in 10-ml vial
⊘Indications and dosages
➣ Growth failure in children with inadequate endogenous GH
Children: 0.16 to 0.24 mg/kg (Genotropin) subcutaneously q week in six or seven divided doses. Or 0.18 mg/kg/week (Humatrope) subcutaneously or I.M., divided equally and given on three alternate days six times weekly (or daily, if epiphyseal closure hasn't occurred). Or 0.024 to 0.034 mg/kg (Norditropin) subcutaneously six or seven times each week using NordiPen injection pen. Or 0.3 mg/kg/week (Nutropin AQ, Nutropin AQ Pen, Tev-Tropin) subcutaneously in equally divided daily doses. Or 0.06 mg/kg (Saizen) subcutaneously or I.M. three times weekly.
➣ Endogenous GH replacement in adults with GH deficiency
Adults: 0.04 mg/kg/week (Genotropin) subcutaneously in six or seven divided doses. Or 0.006 mg/kg/day (Humatrope) subcutaneously. Or initially, no more than 0.006 mg/kg/day (Nutropin AQ, Nutropin AQ Pen, Tev-Tropin) subcutaneously; may increase to a maximum of 0.025 mg/kg daily in patients younger than age 35 or 0.0125 mg/kg/day in patients ages 35 and older. Or 0.005 mg/kg/day (Saizen) subcutaneously; may increase to a maximum of 0.01 mg/kg/day after 4 weeks, depending on patient tolerance.
➣ Short stature related to Turner's syndrome
Children: 0.375 mg/kg/week (Humatrope) subcutaneously, divided into equal doses given on 3 alternate days or daily. Or up to 0.375 mg/kg/week (Nutropin AQ, Nutropin AQ Pen) subcutaneously, divided into equal doses given three or seven times weekly.
➣ Idiopathic short stature (non-GH-deficient) in children whose epiphyses haven't closed
Children: Up to 0.37 mg/kg (Humatrope) subcutaneously q week. Divide dosage and give in equal doses six or seven times weekly.
➣ Growth failure in children with Prader-Willi syndrome
Children: 0.24 mg/kg/week (Genotropin) subcutaneously in six or seven divided doses
➣ Infants born small for gestational age
Children: 0.48 mg/kg/week (Genotropin) subcutaneously in six or seven divided doses
➣ AIDS wasting or cachexia
Adults and children weighing more than 55 kg (121 lb): 6 mg (Serostim) subcutaneously at bedtime
Adults and children weighing 45 to 55 kg (99 to 121 lb): 5 mg (Serostim) subcutaneously at bedtime
Adults and children weighing 35 to 45 kg (77 to 99 lb): 4 mg (Serostim) subcutaneously at bedtime
Adults and children weighing less than 35 kg (77 lb): 0.1 mg/kg/day (Serostim) subcutaneously at bedtime
➣ Growth failure due to chronic renal insufficiency (up to time of kidney transplantation)
Children: Up to 0.35 mg/kg/weekly (Nutropin AQ, Nutropin AQ Pen) subcutaneously, divided into daily doses
➣ Short bowel syndrome in patients receiving specialized nutritional support
Adults: 0.1 mg/kg/day subcutaneously (Zorbtive), to a maximum of 8 mg/day for no more than 4 weeks
Contraindications
• Hypersensitivity to drug, benzyl alcohol, glycerin, or metacresol (with some diluents)
• Active neoplasia
• Acute, critical illness after open-heart surgery, acute respiratory failure, or multiple trauma
• Children with closed epiphyses
• Neonates (Zorbtive)
Precautions
Use cautiously in:
• hypothyroidism
• diabetes mellitus.
Administration
• Reconstitute by injecting supplied diluent through rubber top of vial and aiming liquid stream at side of vial. Swirl vial gently to mix; don't shake.
• Inspect reconstituted solution. Don't use if it has visible particles or is cloudy.
• Keep diluted drug refrigerated; use within 14 days.
• When using prefilled cartridges, follow manufacturer's instructions carefully.
• Know that patients receiving Zorbtive for short bowel syndrome may receive specialized nutritional support as needed.
| Route | Onset | Peak | Duration |
| I.M., subcut. | Unknown | 1-5 hr | 12-48 hr |
Adverse reactions
CNS: headache, weakness
CV: mild and transient edema
GU: hypercalciuria
Hematologic: leukemia
Metabolic: fluid retention, mild hyperglycemia, hypothyroidism, ketosis
Musculoskeletal: localized muscle pain, tissue swelling, joint pain
Skin: rash, urticaria
Other: pain, inflammation at injection site
Interactions
Drug-drug. Androgens, thyroid hormone: epiphyseal closure
Corticotrophin, corticosteroids: inhibited growth response (with long-term use)
Drug-diagnostic tests. Alkaline phosphatase, glucose, inorganic phosphorus, parathyroid hormone: increased levels
Patient monitoring
• Monitor patient's height, X-rays, blood chemistry results, blood glucose level, and thyroid function studies.
☞ Watch for signs and symptoms of leukemia.
Patient teaching
• Advise patient and parents that regular check-ups and blood tests are needed to detect adverse reactions.
• Teach parents how to reconstitute and administer drug. Stress importance of following manufacturer's instructions carefully when using prefilled cartridges.
• Teach parents about proper handling and disposal of syringes, needles, and cartridges.
• As appropriate, review all significant and life-threatening adverse reactions and interactions, especially those related to the drugs and tests mentioned above.
Humatrope™
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