Modafinil is a medication that has gained popularity in recent years for its ability to improve focus and alertness. It is commonly prescribed for conditions such as ADHD, narcolepsy, and shift work sleep disorder. Provigil is a brand name for modafinil that is often used interchangeably with the generic medication. Many people buy modafinil online from various sources, including Reddit forums, to improve productivity and cognitive function. However, it is important to note that modafinil is a prescription medication and should only be used under the guidance of a healthcare professional. Some common side effects of modafinil include headaches, nausea, and nervousness. While some people report feeling limitless and experiencing cognitive enhancement with modafinil, it is important to understand that the long-term effects of this medication are not yet fully understood. Overall, modafinil is a popular medication that has been shown to be effective for certain medical conditions, but should be used responsibly and with caution.