They are usually sold loose in bags or crushed into tablets. The effects of mushrooms are very similar to acid, although some report a more 'natural' high sometimes with a feeling of being detached. Much the same as acid. Some users complain of nausea, dizziness, vomiting, diarrhoea and stomach pains. Like all hallucinogens, how good or bad your trip will be can be affected by who you are with, where you are and how you're feeling at the time.
Some people also report flashbacks.
It is important to be in a safe environment as some people can panic and get confused. There are no serious problems such as dependence and withdrawal associated with the drug, and as the body quickly develops tolerance, continuous use is unlikely. The hallucinatory effects of the drug can make people at risk of accidents, while the biggest risk is of people mistakenly picking and consuming poisonous mushrooms - make sure you know what you're taking. If in any doubt, don't take them. Its effects are likened to ecstasy with heightened visual imagery, increased bodily awareness and sensitivity and an increased sex drive.