I advise you not to apply for a patent, because when you get patent protection, what you get is the disclosure of technology. In other words, even if your application is authorized, it will only be protected for 20 years. If you choose to use technical secrets for protection, it is permanent protection.
The key is whether your formula can be easily cracked or patented. However, according to the patent law, such drugs for the treatment of mental illness cannot be patented, depending on what your application documents and claims say. You'd better find a professional patent agency to help you apply.