3) People with acrophobia (fear of heights) sometimes enroll in therapy sessions to help them overcome this fear. Typically, seven or eight therapy sessions are needed before improvement is
noticed. A study was conducted to determine whether the drug D-cycloserine, used in combination
with fewer therapy sessions, would help people with acrophobia overcome this fear. Each of 27
people who participated in the study received a pill before each of two therapy sessions. Seventeen
of the 27 people were randomly assigned to receive a D-cycloserine pill, and the remaining 10
people received a placebo. Three months after the administration of the pills and the two therapy
sessions 61% of those receiving D-cycloserine pill improved their acrophobia, while 33% of those
in the placebo group improved their acrophobia.
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