In his book PiHKAL, the minimum dosage is listed as 200 mg, and the duration unknown. MDPR is a promoter; by itself it has almost no effects on the mind, but it promotes the effects of hallucinogens, similarly to the closely related MDPH.
In his book PiHKAL, the minimum dosage for MDPR is 200 mg, and its duration is not specified. MDPR acts as a promoter; on its own, it has little effect on the mind but increases the potency of hallucinogens, similar to MDPH.