Hello,
Mostly it would pass out spontaneously if she starts taking more fluids, enough to have a clear urine output of over 2-2.5 litres per day. Restrict salt, if possible to reduce chances of stone growth and recurrence.
Avoid excess non-vegetarian diet, but can take in limited quantities.
Oral
potassium citrate, which is potrate syrup, is extremely safe under normal circumstances and can be taken at doses of 10-15 ml thrice daily with water after meals by your wife if you are definitely aware that her
kidney function is normal and she has no significant gastric trouble.
You can continue this drug for the next month or so and we can take a further decision to stop or continue after you visit your
Urologist and some more reports are available.
Hopefully, by the time you visit your doctor, with this regimen, the 4mm stone would have passed off spontaneously.
If she has pain in loin due to the stone coming down, she can take tablets like
Buscopan for relief, though I seriously doubt if it would be required.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Ivan R. Rommstein, General Surgeon