Buying Ritalin online is not recommended due to the potential for misuse, fraud, and other safety risks. It is important to note that medications such as Ritalin should only be taken under the direction and supervision of a qualified healthcare professional. Furthermore, there is no guarantee that the medication you receive online is legitimate or safe. As for the effectiveness of Ritalin, it is a stimulant medication used to treat ADHD and is effective for many people. However, it is important to discuss any potential risks and benefits of taking Ritalin with your doctor.