<p><strong>Splenic Rupture</strong>: Splenic rupture, including fatal cases, can occur following the administration of Pegfilgrastim. Evaluate for an enlarged spleen or splenic rupture in patients who report left upper abdominal or shoulder pain after receiving Pegfilgrastim.<br />
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<strong>Acute Respiratory Distress Syndrome</strong>: Acute Respiratory Distress Syndrome (ARDS) can occur in patients receiving Pegfilgrastim. Evaluate patients who develop fever and lung infiltrates or respiratory distress after receiving Pegfilgrastim for ARDS. Discontinue Pegfilgrastim in patients with ARDS.<br />
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<strong>Serious Allergic Reactions</strong>: Serious allergic reactions, including anaphylaxis can occur in patients receiving Pegfilgrastim. The majority of reported events occurred upon initial exposure. Allergic reactions, including anaphylaxis can recur within days after the discontinuation of initial anti-allergic treatment. Permanently discontinue Pegfilgrastim in patients: with serious allergic reactions. Do not administer Pegfilgrastim to patients with a history of serious allergic reactions to Pegfilgrastim or Filgrastim.<br />
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<strong>Patients with Sickle Cell Disorders</strong>: Severe sickle cell crises can occur in patients with sickle cell disorders receiving Pegfilgrastim. Severe and sometimes fatal sickle cell crises can occur in patients with sickle cell disorders receiving Filgrastim, the parent compound of Pegfilgrastim.</p>