I have a friend who has a lot of lizards in his place. Also inside of the house. They make a kissing sound which means they are probably mating or just being annoying. Every night when you walk anywhere in the house you see them crossing your paths. I was wondering what type of poison could he get to kill them off? There is a ton of lizards and he would just like to kill off the ones in his house. He lives in Switzerland.

Hayhay, it is not a good idea to poison them. If that is done, your friend is going to have an amazing stench inside and around the outside of his house when they die. He won't be able to find all the bodies and it takes weeks, if not months, for the odor to dissipate. I don't know where your friend lives and don't know what types of lizards he is plagued by, but I am sure the pest control experts in his area are used to dealing with this problem. Look through his regional yellow pages directory and call a few to come in and give him some estimates to remove the ones that are there, and to give him guidance as to how to effectively keep them from returning.

Bet he doesn't have any problem with flies or insects. I don't think they would take up residence inside and in any great number unless there was some food source. Some cultures consider those critters living in their house to be a sign of good fortune.

Mothballs usually works on deterring reptiles and such...