What does amanita muscaria do?

Amanita Muscaria, AKA "Fly Agaric" or "Toadstool" is a halluciogenic mushroom which CAN be poisonous in large amounts. However, it can be dangerous in small amounts, as everyone reacts differently to mushrooms, poisonous or not. In Siberia, A. Muscaria was used for shamanic purposes as an alternate method of acheiving a trance-like state.