LSD analogues are substances that are chemically very similar to LSD and can have comparable effects. Some of them have been known for a long time (e.g. ALD52, ETH-LAD, AL-LAD, PRO-LAD etc.) and have been studied pharmacologically as well as psychopharmacologically, at least in part. Others are newer "creations" (e.g. the derivatives 1P-LSD,1B-LSD, 1cP-LSD, 1V-LSDetc.), for which only few or no data are available. Certain LSD analogues can (still) be legally produced, traded and consumed in some countries, which is the main reason for their distribution.
Most LSD analogues are naturally different from LSD in their effect and/or potency (e.g. ETH-LAD, AL-LAD, LSZ etc.). In contrast, the so-called 1-acylated LSD compounds (e.g. 1P-LSD, 1V-LSD, 1B-LSD, ALD-52, etc.) are presumed, on the basis of pharmacological studies, to convert into LSD in the body (they function as so-called prodrugs) and thus have a comparable psychoactive effect to LSD.
In the case of prodrugs of LSD and LSD analogues, it has not been conclusively clarified whether, in addition to their psychoactive effect, they can produce other pharmacological effects. How potent these prodrugs are compared to the resulting substance (e.g., 1P-LSD to LSD), and to what extent a delay in onset of action occurs in each case, may be substance-dependent and cannot be generalized. Therefore, it is important to approach the dose/effect carefully to avoid overdoses.