@wendyw - I was just learning what lithotrypsys is and it lead me to reread your original post. Assuming your son is taking Effexor to treat are many depression have you considered switching meds to see if it helps? There are many meds available for depression and although it can take awhile for them to get in your system and work well it sounds like his life is somewhat on hold anyway so now might not be the worst time to try a change. Obviously, he should speak with his prescribing doctor to make the decision that is best for him but it would at least eliminate Effexor as a variable in the possible cause of his frequent kidney stones. Otherwise, the Mayo link that was shared before gives some home remedies you can try, especially since you know what type of kidney stones he has.