(lucy, tabs, blotter, acid)

LSD (Lysergic acid diethylamide) is a hallucinogenic drug that was first synthesised by Albert Hofmann in 1938. Its hallucinogenic properties were discovered in 1943 when Hofmann accidentally ingested some and had a now iconic bike ride home. LSD generally comes absorbed onto a small square of paper and is sometimes available as a clear, tasteless liquid or dropped onto sweets/sugar cubes.

Effects | Dosage | Advice | Support


The effects of LSD generally take around 30-90 minutes to kick in and will last 9-14 hours:

  • Visual and auditory hallucinations
  • Distortions of time and perception
  • Spiritual connection to the earth/other people
  • Confusion
  • Anxiety/paranoia
  • Disorientation
  • Psychosis-like symptoms


As always, the appropriate dose will depend on your weight, tolerance and gender, amongst other factors. This is a guide only:

  • Low: 25–100 µg (people report feeling some effects with as little as 20 µg)
  • Medium (common): 65–175 µg
  • High: 175–250 µg
  • Heavy: 250+ µg

Harm Reduction Advice

  • Use a low dose. Your trip will last a long time and you won’t know how strong it’s going to be until you’re already feeling the effects.  Don't be tempted to re-dose.  The effects can take a while to kick in and can creep up on you.
  • Use with people you know and trust and in a safe, calm environment to reduce the chance of having a bad trip. Don’t use LSD if you’re already feeling worried, anxious or depressed.
  • If you’re having a bad trip, remind yourself you have taken a drug and that the effects will wear off.
  • Consider having a 'trip sitter', someone who remains sober and can help out if someone is having a bad time.
  • If someone can’t be 'talked down' from a bad trip, consider seeking medical assistance.
  • More physically harmful substances such as the NBOMBe series are sometimes sold as LSD. Follow the mantra "if it's bitter, it’s a spitter" and remove the tab from your mouth if it has a bitter, chemical taste it is likely your tab isn’t LSD (which is tasteless).
  • Do not attempt to get in the car and drive. Make sure you find a safe alternative.

Access Support

The Drop is BDP's one stop shop for support, advice and resources around party drugs.

Visit The Drop

External Resources

Drug combinations

Visit drugsand.me for more information.

Image Credit: Dominic Milton Trott