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SOMAVERT® (pegvisomant) Highlights


These highlights do not include all the information needed to use SOMAVERT safely and effectively. See full prescribing information for SOMAVERT.

SOMAVERT (pegvisomant) for injection, for subcutaneous use
Initial U.S. Approval: 2003


SOMAVERT is a growth hormone receptor antagonist indicated for the treatment of acromegaly in patients who have had an inadequate response to surgery or radiation therapy, or for whom these therapies are not appropriate. The goal of treatment is to normalize serum insulin-like growth factor-I (IGF-I) levels.(1)


  • Administer a 40 mg loading dose subcutaneously under physician supervision (2.1)
  • After proper injection instruction, on day after loading dose, patients or caregivers begin daily subcutaneous injections of 10 mg (2.1)
  • Adjust dosage in 5 mg increments or decrements until serum IGF-I concentrations are maintained within age-adjusted normal range. Do not adjust dosage based on growth hormone (GH) levels or signs or symptoms of acromegaly (2.1)
  • Dosage range is 10 to 30 mg once daily (2.1)
  • Perform liver tests prior to first dosage and if greater than 3 time upper limit of normal should work-up prior to SOMAVERT administration (2.2)
  • Follow reconstitution and injection procedures (2.3, 2.4)


For injection: 10, 15, 20, 25 or 30 mg (as protein) lyophilized powder in single-use vial for reconstitution (3)


None (4)


  • Hypoglycemia: Monitor blood glucose in patients with diabetes mellitus and reduce anti-diabetic drug therapy as necessary (5.1)
  • Liver Test Elevations: Should have more frequent liver tests and/or discontinue SOMAVERT (5.2)
  • Systemic Hypersensitivity: Monitor closely when re-initiating SOMAVERT in patients with systemic hypersensitivity (5.5)


Most common reported adverse reactions (> 6%) are infection, pain, nausea, diarrhea, abnormal liver tests, flu syndrome, injection site reaction (6)

To report SUSPECTED ADVERSE REACTIONS, contact Pfizer at (phone 1-800-438-1985 or FDA at 1-800-FDA-1088 or


  • Insulin and/or Oral hypoglycemic Agents: Patients with acromegaly and with diabetes mellitus may require careful monitoring and dose reductions of insulin and/or oral hypoglycemic agents. (5.2, 7.1)
  • Opioids: Patients on opioids may need higher SOMAVERT doses to achieve appropriate IGF-I suppression. (7.2)

See 17 for PATIENT COUNSELING INFORMATION and FDA-approved patient labeling.

Revised: 4/2016

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