The primary purpose of the trial is to assess how effective pregabalin, alprazolam, and placebo are at reducing anxiety levels of subjects who take a dose of these treatments 4 hours before a scheduled dental procedure.

Inclusion Criteria:

• Male or female outpatients 18 years of age or older who score 12 points or more on the Dental Anxiety Scale at screening and baseline evaluations and have a scheduled appointment for an elective dental procedure.

Exclusion Criteria:

• Current diagnosis of any of the DSM-IV anxiety disorders.
• Current diagnosis of major depressive disorder, dysthymia, schizophrenia or any other psychotic disorder, bipolar disorder, and eating disorders as assessed by the M.I.N.I. at screening, or current diagnosis of delirium, dementia, or body dysmorphic disorder.