Warnings and Precautions
Thrombocytopenia, Anemia and Neutropenia
Treatment with Jakafi can cause thrombocytopenia, anemia and neutropenia. [see Dosage and Administration].
Thrombocytopenia was generally reversible and was usually managed by reducing the dose or temporarily interrupting Jakafi. Platelet transfusions may be necessary [see Dosage and Administration].
Patients developing anemia may require blood transfusions and/or dose modifications of Jakafi.
Severe neutropenia (ANC less than 0.5 × 109/L) was generally reversible. Withhold Jakafi until recovery [see Adverse Reactions].
Perform a pre-treatment complete blood count (CBC) and monitor CBCs every 2 to 4 weeks until doses are stabilized, and then as clinically indicated [see Dosage and Administration, and Adverse Reactions].
Risk of Infection
Serious bacterial, mycobacterial, fungal and viral infections may occur. Active serious infections should have resolved before starting therapy with Jakafi. Observe patients receiving Jakafi for signs and symptoms of infection and initiate appropriate treatment promptly.
Progressive multifocal leukoencephalopathy (PML) has been reported with ruxolitinib treatment for myelofibrosis. If PML is suspected, stop Jakafi and evaluate.
Advise patients about early signs and symptoms of herpes zoster and to seek treatment as early as possible if suspected [see Adverse Reactions].