Actemra is a type of synthetic protein administered through an injection. It is used mostly in patients suffering from rheumatoid arthritis. This drug is immunosuppressive which means it affects the immune system and its effectiveness in battling infections. It is important to test patients for various infections, especially TB, before prescribing and administering this particular medication. Close monitoring of patients using this medicine is also very important and highly recommended. Actemra acts by blocking the action of IL-6, which causes inflammation.