Here is some interesting metabolic information:
Metabolic half-life of:
MDMA: 9 hours, 72 hours traceable @ 1%
Psilocybin: 5 +- 1 hours, 48 hours traceable @ 1%
The chemical name for psilocybin is: 4-phosphoryloxy-N,N-dimethyltryptamine
Psilocybin and Psilocin are both structually similar to seratonin which is: 5-hydroxytrytamine
As the psilocybin and psilocin bind to seratonin receptors, the seratonin receptors (typically the 5-HT2A receptors) are over-stimulated as the body has an inefficient re-uptake mechanism for psilocybin and psilocin.
Fortunately, psilocybin and psylocin are easily oxidized and hence become inefficient at this point.
I would tell you what chemicals to ingest to immediately flush the psilocybin and/or psylocin from your body .. but they would all kill you