FDA approves KarXT, a new schizophrenia treatment by Bristol Myers Squibb, offering improved symptoms and fewer side effects. KarXT, a combination of Xanomeline and trospium, targets muscarinic receptors and reduces digestive issues. The drug is expected to be cost-effective if priced between $16,000 and $20,000 per year, with 75% of patients seeing symptom improvement by 30% or more after one year.