PCP never really does leave the system completely. PCP attaches itself at the back of the brain and stays there for a period of time. As for the affects of PCP, the affects vary how long you have it based on your reaction to the trip. You can have a really bad trip and have it stay that way for days or weeks or even longer than that, depending on your reaction. Otherwise, PCP affects leave after a substantial amount of time. The affects usually last a good deal of time, and it can make one extremely violent and cause harm to others or themselves. PCP is a powerful drug that can turn anyone for the worst, and many PCP panic attacks come after usage of the drug. Once someone uses PCP for the first time, you are more likely to have problems with it later on, as PCP triggers very heavy panic attacks at random moments. PCP panic attacks tend to come at random times, and can be very dangerous. These panic attacks can last a lifetime from just one usage, depending on the user. They usually have longer-termed affects, which makes it different than other heavier drugs. I hope this answers your question!
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The drug PCP will normally show up in a urine test for about 7 days. It will be present longer if someone is a heavy user.