Nephrocalcinosis
"I was put on Thiazide 25mg for severe life long  Nephrocalcinosis (kidney stone disease).
I have been on it 6 weeks.
Yes it cut my urine calcium in half which is great and what we wanted but I have had some terrible side effects:
Daily migraines and new acne daily on jaw line (never had acne until I started this medication).
It lowered my potassium levels causing lethargy and muscle weakness.
Took a 2 day break and instant stop of headaches and no new pimples for 2 days.
Have gone back on it today but only taken 12.5mg to see if it makes a difference, only time will tell if I get a headache soon and then I will know for sure it is the tablet causing it."