A radiopharmaceutical drug is a pharmaceutical that delivers therapy or aids in diagnosis through use of a radioisotope.

Radioligand therapy is most commonly done with multiple injections of a radioligand drug. It is commonly monitored by other radioactive imaging techniques like PET of SPECT imaging, which are powerful tools used to visualize tumours and track patient progress.

Radioactive drugs are subject to the same high standard that all therapeutics and diagnostics must meet set by government regulators.

Radioisotopes are high energy forms of natural elements that emit various forms of energy into their surroundings.