How Liquid LSD is Dosed
There is no standard potency of a drop of liquid LSD. A single drop typically ranges from 75 ugs to 300 ugs, but could be lower or higher.
The manufacturer of liquid LSD will determine the potency of each drop, by controlling the ratio of crystalline LSD to the alcohol/water solvent used. For example, if a manufacturer wants a 125 ug dose from a single drop and one assumes a standard dropper bottle dispenses 0.05 ml per drop of LSD (this is a commonly used assumption), then one must mix a concentration of 125 ug of LSD per 0.05 ml of final solution.
To get a desired dose, two conditions must be true: (i) the LSD solution is at the desired concentration (e.g., 125 ug per 0.05 ml), and (ii) the dispensing device consistently distributes the desired amount of liquid (e.g., 0.05 ml per drop).