Final answer:
Fluoxetine, also known as Prozac, is an SSRI used to treat depression. St. John's Wort is the herbal therapy that should be avoided when taking fluoxetine.
Step-by-step explanation:
Fluoxetine, also known as Prozac, is a selective serotonin reuptake inhibitor (SSRI) commonly used to treat depression. It works by increasing the levels of serotonin in the central nervous system. When taking fluoxetine, it is important to be cautious about using certain herbal therapies that can interact with the medication. According to the information provided, the herbal therapy that might be dangerous when taken with fluoxetine is St. John's Wort.