Rybrevant 350mg injection contains the active substance Amivantamab. It is an antineoplastic drug that belongs to the class of medications called bispecific antibodies. It is used to treat a type of cancer called non-small cell lung cancer (NSCLC) that spreads to other parts of the body and has certain changes in a gene called EGFR. It is also used if it cannot be removed by surgery and has worsened during or after treatment with other anticancer medications.