Rolicyclidine (PCPy) is a dissociative anesthetic agent that has hallucinergic and sedative properties. In rats, it produces stimulant effects like that of PCP (hydrochloride) and was therefore added to the Schedule I list of illegal drugs in the USA. It is thought to be much less stimulating than PCP however, and more similar to opioids, or other central nervous system depressants.

Rolicyclidine (PCPy):
https://drugs.ncats.io/drug/183O9O9JE3

Rolicyclidine

Duration: Rolicyclidine, also known as PCPy, is a dissociative with effects similar to PCP. While this dissociative anesthetic has hallucinogenic and sedative effects, it is said to be much less stimulating than PCP. In this sense it is more similar to opioids, or other central nervous system depressants.
Route	Onset	Duration	After Effects
Tripsit Factsheets
Rolicyclidine Basic Information: http://drugs.tripsit.me/rolicyclidine
Oral:	30-60 minutes	2-6 hours	1-8 hours
Nasal:	30 minutes	2-6 hours	1-8 hours
Avoid: All other CNS depressants.

Rolicyclidine (hydrochloride) RM Safety Data Sheet (PDF 5 pages):
https://www.caymanchem.com/msdss/19263m.pdf

• A dissociative anesthetic
• Hallucinogenic and sedative effects

It is similar in effects to phencyclidine (PCP) but is slightly less potent and has less stimulant effects. It instead produces a sedative effect described as being somewhat similar to a barbiturate, but with additional PCP-like dissociative, anaesthetic and hallucinogenic effects.

Due to its similarity in effects to PCP, PCPy was placed into the Schedule I list of illegal drugs in the 1970s, although it has never been widely abused and is now little known.