Read the label?
Every product label that I have seen that contains either medicinal or potentially lethal ingredients has both the active ingredients listed and the inactive ingredients. I lost my label for the PAM, so i can only assume the inactive ingredients are listed.
I have used PAM with good success, but you do have to be careful about using it with some species of snakes and lizards that have been found to be more sensitive to permethrins, so you do need to do your research and you do need to follow the instructions. I also know that some people have used the other products mentioned here with good success. Most mattress and lice products have very little to no toxic ingredients because they are made to be used on humans, but some do have more permetherines, so they might need to be diluted.