Chlormerodrin is a mercurial diuretic commercially traded from 1952[1] until 1974[2] that was once used to treat patients with heart failure,[3] but is no longer in widespread use.

[4] The radiolabelled form (197Hg & 203Hg) had also been used for medical imaging of the kidney and brain[5][6] and the 197Hg form was even considered a contender for 99mTc by some physicians,[7] but was ultimately discontinued by the FDA in 1989.

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