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LSD is the original psychedelic drug. Those that take it experience a 'trip'; seeing and feeling things that aren't really there. But a bad trip is more like a real life nightmare.

If the acid is strong you can experience full-blown hallucinations

AKA

Acid, blotting paper, blots, microdots, tabs, trips, Lucy. The chemical name is Lysergic Acid Diethylamide.

What is it?

LSD is the original psychedelic drug. It is a man-made chemical that usually comes in tiny dot-like tablets or small squares of blotting paper that are called tabs of acid. When you take a tab of acid you will experience a trip.

How does it make you feel?

If it is mild, acid will give you a dreamy experience. Colours and lights look very vivid. You will probably see sparkly trails following moving objects. All your senses become heightened.

If the acid is strong then you can experience full-blown hallucinations. You will see and experience things that don't exist - which could lead you to do things in real life that are dangerous to you.

There is no way of knowing how strong a tab of acid is - which makes taking it pretty risky.

People can have 'bad trips', where they experience extreme fear, paranoia, depression or panic. The chances of this are increased if you take acid when you feel at all stressed or unhappy, because acid builds on how you already feel. A trip can last anything from 5-12 hours, which is a long time if it's not a good one.

What are the health effects?

The most common problem with acid is the 'bad trip' experience. If you try it, make sure you are in a place where you feel safe and comfortable, surrounded by people you trust.

If you use it regularly often you can suffer with mental illnesses. If you have a family history of mental illness then acid is best avoided.

Some people have complained that they suffer acid flashbacks long after a trip. These are not really understood.

The law

LSD is an illegal Class A drug. The maximum penalty for possession is seven years in prison and life for supply. You can get an unlimited fine for both.

BBC Advice factfiles are here to help young people with a broad range of issues. They're based on advice from medical professionals, government bodies, charities and other relevant groups. Follow the links for more advice from these organisations.