Buy Ritalin online is used to treat attention deficit hyperactivity disorder ADHD. The generic name of Ritalin is methylphenidate. It is of two variants there areRitalin 10 mgand Ritalin 20 mg. take this medicine by mouth with or without food, usually 2 to 3 times daily. This medication is best taken 30 to 45 minutes before a meal. Taking this medication late in the day may cause trouble sleeping (insomnia). It is best for adults. Never take an overdose of this medicine because some side effects are seen in the body. It is good for your health because it is clinically approved.