Need to know the concern or info on the use of antibiotics for a long peroid of time ? .. My girlfriend has been on them for 4 years this June 2011 ..for treament of Lyme disease (Chronic). Good or bad?... what are the concerns of going off them ?? .. or staying on them... ??? Protocols?... We are getting worried >> We unfortunately live in Canada ... we are so uninformed >>> Any help would be appreciated. Thanks..