February 9, 2016


Side Effects


The most common adverse drug reactions observed in clinical trials for all subjects and patients are the following:

  • injection site pain (2%)
  • headache (2%).

Less common adverse drug reactions reported include the following:

  • chills,
  • fatigue,
  • rash and
  • nausea.

The following serious adverse reaction is described elsewhere [SEE WARNINGS AND PRECAUTIONS, Clinical Trial Experience]:

Clinical Trial Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Three hundred and seventy seven high risk individuals received VARIZIG intramuscularly in two clinical trials which included pregnant women, infants and immunocompromised pediatric and adult patients. The highest incidence of adverse reactions occurred in pregnant women (n=90), including injection site pain (9%), headache (4%), chills (2%) and fatigue (2%). All other adverse reactions occurred in 1% or less of clinical trial subjects within each high risk group. A single incidence of serum sickness (approximately one in 400 patients treated with VARIZIG) was observed in an immunocompromised adolescent patient.

There were six reported adverse events related to the coagulation system (one deep vein thrombosis) in 372 subjects in the open-label, Expanded Access Protocol (EAP); the study was not designed to differentiate between adverse events attributed to the underlying medical condition and adverse reactions to VARIZIG.

Read the VariZIG (varicella zoster immune globulin (human) for injection) Side Effects Center for a complete guide to possible side effects


The passive transfer of antibodies with immune globulin administration may impair the efficacy of live attenuated virus vaccines such as measles, rubella, mumps and varicella. Defer vaccination with live virus vaccines until approximately three months after VARIZIG administration. Inform the immunizing physician of recent therapy with VARIZIG so that appropriate measures can be taken [see PATIENT INFORMATION].

This monograph has been modified to include the generic and brand name in many instances.

Last reviewed on RxList: 2/19/2013

Side Effects

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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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