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Efficacy
Rhophylac Efficacy Rhophylac® Gives Platelet Levels A Lift With Proven Efficacy.

Rhophylac® is effective in raising platelet counts.

In a study, 98 adult chronic ITP patients with a platelet count below 30,000/microliter were treated with Rhophylac® in a single intravenous (IV) dose of 250 IU (50 mcg/kg body weight). The following results were seen at Day 15: Primary Response Rates by Baseline Platelet Count at Day 15.


Rhophylac Efficacy
  • Overall increase in platelet count at least 20,000/microliter over baseline and up to 30,000/microliter
    • 66% response rate
    • In patients with baseline platelet count of >20,000-30,000/microliter, 89% primary response rate
  • Regression of hemorrhage in patients with bleeding at baseline
    • 88% response rate
  • Increased platelet counts to more than 50,000/microliter
    • 55% response rate
    • 82% response rate in patients with baseline platelet counts of >20,000 to 30,000/microliter

Median time to response was 3 days and median duration of response was 22 days.

How Rhophylac® Works

The mechanism of action is thought to involve the formation of Rh0(D) immune globulin red blood cell complexes, which are preferentially removed by the reticuloendothelial system, particularly the spleen. This leads to an Fc receptor blockade, and as a result antibody-coated platelets are spared. Learn about the Rhophylac® Assurance of Safety.

IMPORTANT SAFETY INFORMATION

Rhophylac® is indicated for suppression of rhesus (Rh) isoimmunization in:

  • Pregnancy and obstetric conditions in non-sensitized, Rho(D)-negative women with an Rh-incompatible pregnancy, including routine antepartum and postpartum Rh prophylaxis and Rh prophylaxis in cases of obstetric complications, invasive procedures during pregnancy, or obstetric manipulative procedures.
  • Incompatible transfusions in Rho(D)-negative individuals transfused with blood components containing Rho(D)-positive red blood cells.

For suppression of Rh isoimmunization, Rhophylac® can be administered IM or IV.

Rhophylac® is indicated to raise platelet counts in Rho(D)-positive, non-splenectomized adult patients with chronic immune thrombocytopenic purpura (ITP). For the treatment of ITP, Rhophylac® must be administered IV.

Rhophylac® is contraindicated in individuals with known anaphylactic or severe systemic reaction to human immune globulin products.

Allergic or hypersensitivity reactions may occur with Rhophylac®; early signs of hypersensitivity include generalized urticaria, chest tightness, wheezing, hypotension, and anaphylaxis. Individuals with selective IgA deficiency can develop antibodies to IgA and may develop severe hypersensitivity and anaphylactic reactions. For these individuals, weigh the expected benefits of treatment against the potential risks.

Rhophylac® is derived from human plasma. The risk of transmission of infectious agents, including viruses and, theoretically, the Creutzfeldt-Jakob disease (CJD) agent, cannot be completely eliminated.

Suppression of Rh Isoimmunization: For postpartum use following an Rh-incompatible pregnancy, Rhophylac® should not be given to the newborn infant.

The most common adverse reactions in the suppression of Rh isoimmunization with Rhophylac® are nausea, dizziness, headache, injection-site pain, and malaise.

Immune Thrombocytopenic Purpura: The most serious adverse reactions in patients receiving Rho(D) immune globulin have been observed in the treatment of ITP. ITP patients being treated with Rhophylac® should be monitored for signs and symptoms of intravascular hemolysis, including back pain, shaking chills, fever, and hemoglobinuria. Potentially serious complications of intravascular hemolysis include clinically compromising anemia, acute renal insufficiency, and, very rarely, disseminated intravascular coagulation, and death.

The most common adverse reactions observed in the treatment of ITP are chills, pyrexia/increased body temperature, and headache. Mild extravascular hemolysis has also been observed. In patients with preexisting anemia, weigh the benefits of Rhophylac® against the potential risk of increasing the severity of the anemia.

Please see full prescribing information.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch or call 1-800-FDA-1088.