Armodafinil, sold under the brand name Waklert among others, is a medication used to improve wakefulness and reduce excessive daytime sleepiness in conditions such as narcolepsy, obstructive sleep apnea (OSA), and shift work sleep disorder. It is a wakefulness-promoting agent, similar to modafinil. Armodafinil is available in various strengths, including 150 mg, which is the dose you mentioned.