Mersalyl acid
Encyclopedia
Mersalyl acid is a mercurial diuretic
Mercurial diuretic
Mercurial diuretics are a form of renal diuretic containing mercury.Although previously widely used, they have largely been superseded by safer diuretics such as thiazides, and are hardly used anymore.-History and mechanism:...

. It is only rarely used, having been superseded by diuretic medications
Diuretic
A diuretic provides a means of forced diuresis which elevates the rate of urination. There are several categories of diuretics. All diuretics increase the excretion of water from bodies, although each class does so in a distinct way.- Medical uses :...

 that do not contain mercury
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...

and are therefore less toxic.
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