HPPD
# HPPD

HPPD may refer to:

* Hallucinogen persisting perception disorder, a perception disorder that can be caused by hallucinogenic drug use
* 4-hydroxyphenylpyruvate dioxygenase, an enzyme found in almost all aerobic life forms and the primary target of some herbicides

   * One of those HPPD inhibitor herbicides, a 4-hydroxyphenylpyruvate dioxygenase inhibitor
