HCPCS Code J2323: Injection, Natalizumab, 1 mg

All injected medication will likely result in pain and discomfort in the injection site. In the case of natalizumab therapy, it's possible for the patient to feel fatigued, experience headaches, and have joint pain. Rarely, it may increase the risk of opportunistic viral infections like progressive multifocal leukoencephalopathy (PML). Another potential rare complication is an allergic reaction. You need to observe the patient after the infusion.

The effects are not felt immediately. For some patients, the benefits are noticeable a few weeks after the infusion. For some, it takes months.

The whole procedure, if you include observation time, will take approximately two hours.