||In 1991, the manufacturer of Halcion (Upjohn) announced that errors had been made in reporting the results of clinical studies used in their application for approval of Halcion for human use. Based on this information, and in combination with reports of amnesia, depression, and violent behavior caused by the product, Halcion was removed from market in the U.K., Brazil, Argentina, Norway, and Denmark. |
Other countries, including the United States and Canada chose to keep the product on the market but to lower the recommended doses and duration of treatment. In 1996, a U.S. government task force reviewed again whether Halcion should stay on the market and concluded that it was safe when taken according to the new (lower dose) product labelling.
There has been quite a bit of controversy about this decision, which may be what you've heard. We did what we could to see whether there have been any recent changes to the status of Halcion in the U.S., and have been unable to find anything which suggests it has been taken off the U.S. market. Most importantly, it is still listed on Upjohn's product information page with a link to U.S. approved prescribing information.
There are many web sites with specific information about the negative effects experienced by some useres. You can get a reasonably good list of these with the following google search:
Hope that helps.