Laxative abuse causes which of the following renal stones?

Laxative abuse causes which of the
following renal stones ?
a) Uric acid
b) Ammonium urate
c) Struvite
d) Ca oxalate
Correct Answer - B
Answer: B - Ammonium urate
Based on the chemical nature two types of kidney stones:
Calcium oxalate (majority).
Others include Uric acid, Struvite (Infected stones), and Cystine
stones (rare hereditary metabolic disorder
Characteristic stone formation in laxative abuse:
Laxative abuse acts a factor in kidney stone formation.
Laxative abuse causes potassium loss
As a compensation mechanism kidney produces large amount of
ammonium.
Resulting in formation of uncommon stone type - ammonium acid
urate.