Technetium (99mTc) medronic acid

Technetium (99mTc) medronic acid is a pharmaceutical product used in nuclear medicine to localize bone metastases as well as other diseases that can alter the natural turn-over in the bone.

Chemistry
The drug is a complex of medronic acid, the simplest bisphosphonate, with technetium-99m (99mTc), a radionuclide that emits gamma rays. The exact structure of the complex is not known.