HCPCS Code J9260: Injection, Methotrexate Sodium, 50 mg

As with any injection, there will be pain and discomfort in the injection site. It's also possible for the patient to feel dizzy and nauseated. They might even vomit. The possible adverse complications, though rare, include allergic reactions, liver damage, lung disease, infection of the injection site, and bone marrow suppression. All of these adverse reactions require immediate attention.

Chemotherapy agents for those with cancer. Corticosteroids for those with autoimmune diseases.

It can take up to 15 minutes. 30, if you count observation for adverse reactions.