Post tretment of rituximab infusion

My wife has this RA disease since 1997. Intially she her disease was not that sever and was contrable with DMRD MTX medicines, however her RA disease become sever and started creating lot problem in her daily routne life. I consulted different doctor for her cure and also search different RA WEB specially on BIO Medicines, I found two type of medicines TNF and B cell control infusion. I have checked expeince of diiferent patients on both of the medicines even contacted RA Assocaition USA about rituximab. I good report on it then in January 07 2008 I advised my wife to go for rituximab infusions. Now 9 months have passed her daily life is normal no RA pain. Now she can walk easily and can do her daily chours as well. I am and wife are happy with result of the medicines but donot know how long me wife will continue without pain. If any one had rituximab infusions please share your experience with me