The most common form of LSD is paper blotter divided into about 1/4" squares called tabs. A single tab usually contains between 30 - 100 ug of LSD. Paper blotters are created by taking a sheet of absorbant paper (usually decorated and perforated) and soaking it in a dilution of lysergic acid diethylamide. The dilution can vary greatly from one batch to another, or one chemist to another. Because of the method used to make blotter tabs, there is no practical way to know the exact dosage of a particular tab without either trying it or knowing the chemist. Adjacent tabs on a sheet will usually contain very similar levels of LSD. Because a blotter tab is so small, only extremely potent chemicals such as LSD can fit at active levels. See the Strychnine myth.

LSD is soluble in water and other solvents, though liquid LSD is usually water based. Liquid LSD is used in the creation of blotter tabs. A single drop of potent liquid LSD could be 50 times a normal dose, although it is generally diluted to the point where a single drop is equal to approximately one dose. This varies greatly from batch to batch, and is sometimes a weak dose while othertimes a very strong dose. Liquid LSD is uncommon. Be extremely careful when dealing with it as there is no way to gauge it's potency. It is frequently stored in small dropper bottles, one precaution...when you reach the end of the bottle, don't rinse it out and assume that what remains is a small dose. There can still be many doses left along the inside surfaces and taking them all at once can lead to some unexpectedly strong and possibly very uncomfortable experiences.

Also known as "window panes". Gelatin LSD is made by mixing liquid LSD with gelatin and forming it into small, thin squares. The benefit of this method is that less of the LSD is exposed to sun and air which break down lysergic acid diethylamide. A single square of gelatin is commonly stronger than a single blotter tab of LSD. (Rough estimate 50 - 150 ug per square).