If your doctor has not already mentioned regular blood tests to monitor kidney/liver functions (glucose and lipid levels as well) then you can request this.
It is purely precautionary, but if you plan on taking any black box Rx for an expended period of time....it can bring peace of mind.
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT