Armodafinil is a prescription medication available in 150mg and 250mg dosages designed to promote wakefulness. It is commonly used for the treatment of excessive sleepiness caused by conditions such as narcolepsy, obstructive sleep apnea, and shift work sleep disorder. Armodafinil works by influencing certain natural substances in the brain that control sleep and wakefulness. The medication is usually prescribed to be taken once daily in the morning, with effects lasting up to 12-15 hours. Common side effects may include headaches and nausea. It is crucial to discuss any possible side effects or concerns with a healthcare provider to ensure the safe use of this medication.