<p data-pm-slice="1 1 []">Like any other medication, Imfinzi 120mg Injection also cause adverse reactions on the body, which disappear when the body gets adjusted to the drug. Some of the common side effects are fatigue, nausea, skin rash, and joint pain. Consult your oncologist immediately if you get any of the serious reactions to the medication like unrelenting headache, chest pain, or decreased amount of urine or blood in urine.