This drug may not function as effectively if used over an extended period of time. If the effects of this drug cease to be felt, see your doctor.Even while it benefits a lot of people, this medicine can occasionally lead to addiction. If you suffer from a substance use disorder, such as an addiction to drugs or alcohol, your risk may be increased. To reduce the chance of addiction, take this medicine as directed by your doctor. For further information, speak with your chemist or physician. Both Arvigil and Waklert contain the same dose of armodafinil, at 150 mg per tablet, but there are some differences in their potency (see number 3 further down).