The San Pedro cactus, also known as Trichocereus pachanoi, is a fast-growing cactus that grows in Peru and Ecuador, where it has been used in rituals for 3000 years. It contains mescaline which is a strong hallucinogen. The cacti is usually dried and cut into edible 'buttons' that are eaten to induce a trip similar to LSD.

What are the effects of the San Pedro cactus?

• It can create a dream-like stance with visions and distortions of sound and scale.
• The experience is similar to LSD, but longer lasting and more physical.
• The trip can last up to 12 hours and the user is usually in a deep trance, completely detached from the world throughout.

What are the risks of the San Pedro cactus?

• It is common to vomit shortly after ingesting the plant.
• Psychedelics can trigger underlying mental health problems.
• Hallucinogens can induce upsetting and frightening experiences you can't stop and have to ride out.

The San Pedro cactus and the law:

Mescaline is illegal in the UK and is listed as a class A drug. However, San Pedro cacti can be bought and sold legally if not intended for human consumption. Legal high providers usually write "not for human consumption" on the packet as a way of dodging the law.

If you are planning on taking San Pedro cactus:

• As with any hallucinogenic, take it in an environment where you feel safe to diminish the chances of having a bad trip.
• Avoid taking it if you have any mental health issues or a history of mental illness in your family.

Updated: 06/12/2010