Olanzapine is being studied for its effectiveness in treating schizophrenia and chemotherapy-induced nausea, with some research suggesting that low doses can be beneficial in reducing nausea without sedation. However, the medication has also been associated with various side effects, including weight gain and cardiometabolic issues, as well as rare conditions such as black hairy tongue. The relationship between olanzapine and its side effects is being explored in various studies, including those examining its concentration and metabolic dysfunction in patients.