As nouns the difference between pharmaceutical and radiopharmaceuticals
is that pharmaceutical
is (medicine) a pharmaceutical or pharmacological preparation or product; a drug while radiopharmaceuticals
As an adjective pharmaceutical
is (medicine) of, or relating to pharmacy or pharmacists.
As nouns the difference between radiopharmaceuticals and radionuclide
is that radiopharmaceuticals
is while radionuclide
is (physics) a radioactive nuclide.