Information, treatment, and forums for sufferers of HPPD (Hallucinogen Persisting Perception Disorder), also known as flashbacks, which happens to some users of psychedelic drugs.

Information on entheogens, psychedelics, and hallucinogens including traditional, spiritual, and responsible use, chemistry, effects, experiences, images, research, legislation, media coverage, bibliographies and links.

Homepage of the Albert Hoffman Foundation. Albert Hoffman is the inventor of LSD.

A mainstream publication for about psychedelics.

Includes text of "A Narrative of the Early Years of American Psychedelianism" and offers the book for sale.

Menu of articles, research papers, books, and essays on LSD, peyote, psilocybin, and the use of psychedelic drugs in research, therapy, religion and personal growth.

Hallucinogens are drugs which act on the central nervous system to produce significant, often radical, changes to the user's state of consciousness. People who have taken them may see or hear things which aren't really there.

Information about psychedelics, entheogens, empathogens (MDMA, Ecstasy), from a pharmacologist and chemist.

Articles on psychedelic mushrooms and DMT (with field notes on DMT experiences); LSD and Ketamine trip reports; preservation of dried psilocybin mushrooms; links to other documents concerning psychedelics.

Information and message boards for people with Hallucinogen Persisting Perception Disorder (flashbacks).

Information regarding the use of hallucinogenic substances for the treatment of cluster headaches and other vascular headaches.

Includes visual art, and forums aimed at those interested in psychedelia. Also includes a picture gallery of some posters to the Usenet newsgroup alt.drugs.psychedelics.

Resource on psychoactive, psychedelic and hallucinogenic plants and their active chemical constituents.

One man's experiences with, and thoughts about, psychedelic substances.