This drug is legal the the galaxy named Parthas. Humans from Earth colonized Parthas thousands of years ago. The year is 5,000,445 years after the first human walked on the moon.
The name of the drug is peezish.
When taken and ingested, after about 1 hour, the human will forget who they are. They must be laying down because they will appear to lose consciousness and their body in Parthas will appear to sleep.
The human ingesting the drug will then be perceive that they are being transported to another planet and that they are being born to another mother.
They will perceive that they are living a new life.
Sometimes they perceive that they die at birth and awaken in Parthas in what is perceived as being no time at all.
Most of the time, the drug peezish causes them to perceive a full life as an entirely different human. They will feel like they have lived decades as someone else.
They will then wake up about three hours later on average in Parthas. They will fully remember nearly every detail (after the age 3 or 4 or 5) on the the planet that the drug seemed to transport them to.
Although the drug is legal to ingest, rarely will anyone ingest it because most all humans in Parthas are aware of its potential effects.