methotrexate: toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis
immunosuppressant: a drug that lowers the body's normal immune response
rex begonia: any of numerous usually rhizomatous hybrid begonias derived from an East Indian plant having rough-textured leaves patterned in silver and bronze and purple and red-brown with inconspicuous flowers