I often wonder whether or not one could get similar effects through meditation. When I was doing regular Buddhist meditation exercises, I felt that I had an increased level of concentration. The disadvantages are that meditation is much harder than taking a pill and the effects might not be as strong. The advantages are that meditation has no harmful long-term side effects and has much longer lasting positive effects than any drug that temporarily alters brain chemistry. Meditation causes long-term changes in brain structure and function.