Modvigil 200 mg (Modafinil) is not considered safe for everyone and should only be taken under a doctor's supervision. It is generally well tolerated, but may not be suitable for people with certain medical conditions, such as heart problems, high blood pressure, liver or kidney problems, or a history of psychiatric disorders such as anxiety, depression, or psychosis. Modvigil may interact with other medications, such as oral contraceptives, blood thinners, and antidepressants, reducing the effectiveness of those medications or causing side effects. Common side effects of Modvigil include headache, dizziness, nausea, insomnia, and anxiety. In rare cases, it can cause more severe side effects, such as skin rashes, allergic reactions, and cardiovascular problems. Additionally, misuse or long-term use without proper guidance can lead to addiction and other health risks. To assess your risks, it is important to consult with your doctor before using Modvigil.