AIDS Treatment Data Network

Clinical Trials

Clinical trials are the way drugs are tested to see if they're safe and if they work. Clinical trials happen in several stages, or Phases. Phase I trials are done in a small number of people to make sure the drug is safe. Phase II trials are done in a larger number of people to see if the drug works. Phase III trials are done in a still larger group of people to continue to examine whether the drug is safe, what side effects it may have, and how well it works

All clinical trials have inclusion and exclusion criteria. Inclusions are the things you must have in order to take part in the trial. Exclusions are the things you cannot have if you want to take part in the trial.

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Should I Join a Clinical Trial? (38K) updated 11/16/1999

This handbook describes the clinical trial process and lists many questions you might want to ask before joining a clinical trial. We will be happy to mail you the printed handbook as well as the Experimental Treatment Guide if you fill out the attached form and send it back to us.

trials of drugs to treat HIV - Open-label T-20 study
(updated 11/6/2001)

trials of drugs to treat opportunistic infections
(updated 7/18/2001)

trials of drugs for treating children
(updated 8/19/1999)

trials of drugs for treating pregnant women
(updated 2/7/99)

information gathering studies
(updated 8/16/1999)

vaccine trials
for HIV-negative and HIV+ participants
(updated 12/7/1999)