Before receiving Rituxan, tell your doctor if you: 1  Have had a severe infusion reaction to Rituxan in the past. 2  Have a history of other medical conditions including: Heart problems. Irregular heartbeat. 3  Have had an infection, currently have an infection, or have a weakened immune system.
Usurpation. The illegal encroachment or assumption of the use of authority, power, or property properly belonging to another; the interruption or disturbance of an individual in his or her right or possession.
Definition of usurp. 1  transitive verb. 2  1a : to seize and hold (office, place, functions, powers, etc.) in possession by force or without right usurp a throneb : to take or make use of without right usurped the rights to her life story.