What is the administration method for Tysabri?

Tysabri, also known as natalizumab, is administered via the intravenous route. This method involves delivering the medication directly into the bloodstream through a vein, which allows for immediate distribution throughout the body. Intravenous administration is particularly important for Tysabri because it is a large monoclonal antibody, and this route ensures that sufficient concentrations of the drug can be achieved quickly and effectively.

The other methods listed, such as subcutaneous (injection beneath the skin), topical (applied to the skin), and oral (taken by mouth), are not suitable for Tysabri. Monoclonal antibodies like Tysabri are typically not effective when taken orally due to the digestive breakdown, and they cannot be effectively administered through topical or subcutaneous methods in the treatment context for which Tysabri is prescribed.