Stelara injections are usually given every 12 weeks, but your first two injections will be 4 weeks apart. Follow your doctor's instructions.

Stelara can lower blood cells that help your body fight infections. This can make it easier for you to bleed from an injury or get sick from being around others who are ill.

Avoid being near people who have colds, the flu, or other contagious illnesses. Contact your doctor at once if you develop signs of infection.

Do not receive a "live" vaccine while you are being treated with Stelara, and avoid coming into contact with anyone who has recently received a live vaccine. There is a chance that the virus could be passed on to you. Live vaccines include measles, mumps, rubella (MMR), oral polio, chickenpox (varicella), BCG (Bacillus Calmette and Guérin), and nasal flu vaccine.

BCG vaccine should not be given for at least 1 year after you receive your last dose of Stelara.

Non-live vaccines (including flu shots) may not work as well during your treatment, and may not fully protect you from disease. Make sure you are current on all vaccines before you begin treatment with Stelara.