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In Sweden, ecologist Tomas Brodin of the Swedish University of Agricultural Sciences is preparing to study whether an antianxiety drug alters relationships between predatory pikes and the perch and roach they eat.

Mr. Stanford has been taking large doses of the antianxiety drug clonazepam, along with antidepressants, for about a year.

“The company will tell you it doesn’t hurt — it does,” said Dr. Tina Alster, a dermatologist in Washington, who has made a pain and an antianxiety drug mandatory for her Ulthera patients.