In general, diuretics like Lasix should be stopped when dialysis is started; however, there are a few exceptions and only the nephrologist can determine whether it is still indicated. It is reasonable to question your nurse or doc if you have started dialysis and are still on any diuretics; in most cases, it is an oversight and should have been discontinued.
This is one reason why patients - and especially new ones - should bring their meds to their primary dialsyis nurses once a month to be checked; they can then contact the nephrologist if necessary. Of course, feel free to ask your nurse* or doc anytime you have a question about your medication regimen.
DeLana
*Make sure you are talking to a nurse - techs are not qualified to give you any information about meds. Some, unfortunately, don't seem to realize that