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Medicis Pharmaceutical Corp's newer anti-wrinkle drug Dysport proved significantly better than Botox at improving crow's feet in a small clinical study, a finding that could give frown lines to market leader Allergan Inc.

Wrinkle-busting Botox has long been used to rev up the sex lives of women who blame waning allure on facial lines and creases, but doctors now say the injections can help smooth problems below the belt as well.