Radiopharmaceuticals are specialized drugs that contain radioactive isotopes and are used primarily in medical imaging and therapy. They are designed for diagnostic and therapeutic purposes, particularly in nuclear medicine. ### Key characteristics: 1. **Radioactive Isotopes**: Radiopharmaceuticals consist of a radionuclide (radioactive isotope) attached to a pharmaceutical component, which can target specific organs, tissues, or cellular receptors in the body.
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A pharmaceutical containing a radionuclide, with uptake and clearance chosen for imaging or treatment. Biological targeting and radioactive decay jointly determine its useful signal and tissue dose.