A Phase 1 MAD Study to Evaluate the Safety and Tolerability of LY03020

This early-phase safety study is testing a new drug called LY03020, which is a long-acting injectable medication being developed for schizophrenia. The study includes both healthy volunteers and people with stable schizophrenia to evaluate safety and how the drug behaves in the body. **You may be eligible if...** - You are between 18 and 45 years old (healthy volunteers) or 18 to 60 years old (people with schizophrenia) - For schizophrenia participants: your condition is currently stable and well-managed - Your weight and BMI are within acceptable ranges for the study - You are willing to follow all study procedures **You may NOT be eligible if...** - You have active, uncontrolled psychiatric illness (for healthy volunteers) - You have other significant medical conditions - You are pregnant or breastfeeding - You have a history of serious drug or alcohol problems - You have taken certain other medications recently Talk to your doctor to see if this trial is right for you.