The effects depend on the user's mood, where they are and who they are with. Magic mushrooms may cause hallucinations - objects, colour and sound become distorted. A trip tends to last about 4 hours. Eating the wrong kind of mushroom can also cause serious illness and even fatal poisoning. If users feel sick they should go straight to hospital with a sample of the mushroom and explain what happened.
Bad trips can happen and can be very frightening.
Once the trip has started, there's no going back. Like any hallucinogen, magic mushrooms can complicate mental problems.