Precautions    

Before taking cladribine,

• tell your doctor and pharmacist if you are allergic to cladribine or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially aspirin and vitamins.
• tell your doctor if you have or have ever had liver or kidney disease.
• you should know that cladribine may interfere with the normal menstrual cycle (period) in women and may stop sperm production in men. However, you should not assume that you cannot get pregnant or that you cannot get someone else pregnant. Women who are pregnant or breast-feeding should tell their doctors before they begin taking this drug. You should not plan to have children while receiving chemotherapy or for a while after treatments. (Talk to your doctor for further details.) Use a reliable method of birth control to prevent pregnancy. Cladribine may harm the fetus.
• do not have any vaccinations (e.g., measles or flu shots) without talking to your doctor.