Inhalants are breathable chemical vapors that produce psychoactive effects. Inhalants fall into the following categories such as volatile solvents, aerosols, gases and nitrites. It produces a rapid high that resembles alcohol intoxication. High concentrations of inhalants cause death from suffocation by displacing oxygen in the lungs and then in the central nervous system so that breathing ceases.

Injectable contrast media falls into two categories such as chemotoxic reactions and idiosyncratic reactions. Chemotoxic reactions result from the physicochemical properties of the contrast media, the dose, and the speed of injection. All hemodynamic disturbances and injuries to organs or vessels perfused by the contrast medium are included in this category. Idiosyncratic reactions include all other reactions. They occur more frequently in patients 20 to 40 years old. Idiosyncratic reactions may or may not be dependent on the amount of dose injected, the speed of injection, the mode of injection, and the radiographic procedure. Idiosyncratic reactions are subdivided into minor, intermediate, and severe.