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Several classic studies demonstrate that activation of specific facial muscles (e.g., clenching a pencil between one's teeth to activate the smiling muscles) can alter mood. These researchers examined whether clinical improvement is associated with decreased depressive facial expression through the use of botulinum toxin type A in the glabellar region.
Inclusion criteria were ongoing major depressive disorder, Hamilton Rating Scale for Depression (HRSD) score of 15 or higher, and a moderate-to-severe vertical glabellar line during maximum frowning. Patients were taking one or two antidepressants or had not responded to at least one previous antidepressant. The investigators assessed 263 patients for eligibility and accepted 30 (23 women; ave…