Some people using hallucinogenic drugs can re-experience the effects of the drug days, weeks, or even years after they used it. This is called hallucinogen persisting perception disorder (HPPD). These ...

It's a condition described as a living hell by sufferers, and it's marked by stigma and shame. WARNING: This story discusses suicide and drug use and may be distressing for some readers. Sheree da ...

Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...

Hallucinogen-persisting perception disorder (HPPD) causes a person to keep reliving the visual element of an experience caused by hallucinogenic drugs. A person with HPPD has frequent visual ...

Hallucinogen Persisting Perception Disorder (HPPD) is a cognitive disorder in which individuals continuously re-experience visual and other sensory hallucinations that they first experienced while ...