If not you may want to tread carefully so as to avoid adding undue stress to the kidneys. ie, in my opinion, Colloidal Silver could potentially reduce toxins and load on the kidney's though it would be important to have a reliable baseline from which to establish whether the treatment is either, helping or exacerbating the issue. Which could lead to making things worst.
PS. pay no attention to the naysayers, in this particular realm of treatment, we just don't know if a treatment will prove helpful unless we try it.