Five nights a week is quite a lot, she may have some strong tolerance as well. It's a semi-low to moderate dose for pain patients I believe IIRC just a higher dosing rate compared to the median rates that I commonly see.
There is some promise with NAC and the bladder nightmare that can happen, but yes agreed, those bladder problems can be heinous, and accepting a mildly reduced efficacy in the short term for the trade of being able to maintain this longer term is the risk argument that I think I'd be making here. <3 :))))
It is a doctor's prescription. You might say that the frequent use has increased her tolerance, but she had no other effects even at the start (other than occasional double vision).
