The best replacement for pcp is angel dust.

The best alternatives to pcp are rated as following:
★★★★★  angel dust
★★★★★  ketamine
★★★★  break barrel
★★★  springer
★★★  dxm
★★★  specialist
★★★  internist
★★  spring air rifle
★★  bath salts
★★  pjp
★  pch
★  contract hire
★  dmt
★  bank loan
★  lsd
★  npi
★  spring air rifles
★  hire purchase
★  lease hire
  embalming fluid
  springer air rifle
  company car
  internal medicine
  spring airgun
  personal lease
  nitro piston

Your alternative for pcp is not listed? Suggest!
Speaking about pcp, one probably shouldn't forget about aids.

Other search terms related to pcp and their ratings are:

★★★★★ aids
★★ marijuana
You have in mind a companion for pcp and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of pcp in all years. Click on graph for more.
angel dust