Abstract: A pharmaceutical product includes a container having an exterior surface and an interior chamber, an active ingredient disposed in the interior chamber, the active ingredient having a photosensitive property that changes based on at least cumulative exposure to light having a wavelength within the range between X and Y, and a layer of photosensitive material disposed on or in the container and exposed to environmental conditions contemporaneous with the active ingredient being disposed in the interior chamber. The photosensitive material is reactive to light having a wavelength within the range between X and Y to experience a property change at a threshold of cumulative exposure to light received within the range between X and Y related to the change in the photosensitive property of the active ingredient. A photosensitive device can also be disposed along a path followed by the pharmaceutical product within a facility.