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. Tuberculosis has been reported in patients receiving Jakafi for myelofibrosis. Attention should be given to the possibility of latent or active tuberculosis. 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.

Herpes Zoster
Advise patients about early signs and symptoms of herpes zoster and to seek treatment as early as possible if suspected [see Adverse Reactions].