As Grizzly Bears age, they gain greyish white tips on the dark shoulder hairs and around their head and ears. This is the grizzled or frosted look, and they have the nickname of silvertip. There are no entire white hairs, just the tips are...
After finally being diagnosed, I went on Pyridium - it actually got rid of the pain! So, I only use it for flareups. However, I've found that when the pain is really bad, it is just moderated. Have taken Pyridium for 3-4 weeks straight without side effects except mild stomach upset if taken without food.
Medicine containing pyrethrins is used to treat head, body, and pubic lice infections. This medicine is absorbed by the lice and destroys them by acting on their nervous systems. It does not affect humans in this way. The piperonyl butoxide is included to make the pyrethrins more effective in killing the lice.