LSD comes in several different forms. The most common is paper blotter. Other forms include gell caps, liquid, and gelatin. Each form will contain different quantities and purities of lysergic acid diethylamide. The chart below shows dosages for pure LSD measured in micrograms (ug). Micrograms are 1/1,000,000 of a gram.

Oral LSD Dosages
Threshold 20 ug
Light 25 - 75 ug
Common 50 - 150 ug
Strong 150 - 400 ug
Heavy 400 + ug
LD50 (Lethal Dose*) 12,000 ug


Onset : 30 - 120 minutes (usually about 1 hr)
Duration : 6 - 14 hours
Normal After Effects : up to 24 hours


* LD50 = dose which will kill 50% of the tested animals.

LD50 SOURCES
Clinical Management of Poisoning and Drug Overdose
by Haddad Winchester
page 459:
"No well-documented human deaths resulting directly from the toxic effects of LSD itself have occurred, though LSD has been implicated in accidental deaths, suicides, and homicides. LD50 (That's lethal dose in 50% of those who injest this much) determinations vary widely with species, begin 46 mg/kg in mice, 16.5 mg/kg in rats, 0.3 mg/kg in rabbits and 0.1 mg/kg in elephants. In monkeys, the LD100 is 5 mg/kg. Death in these animals is the result of respiratory failure, preceded in the rabbit by marked hyperthermia. Human data are manifestly lacking, and predictions of the average lethal dose for humans have ranged from 0.2 mg/kg to more than 1 mg/kg, administered orally.

Pharmacotheon by Ott
by Jonathon Ott
p.139
"I must emphasize that there is no danger of death or injury from overdose of LSD, which must have about the highest therapeutic index of any drug known (the ratio of fatal dose to effective dose is unknown since no human being has ever died from an overdose of LSD, but must be very high, as individuals have mistakenly ingested hundreds of doses at a sitting; this is a way of saying that the drug is not at all toxic)."