Armodafinil 250 mg is a prescription medicine that promotes wakefulness. It is used to treat excessive daytime sleepiness caused by:
Narcolepsy
Obstructive sleep apnea (OSA) (along with appropriate treatment such as CPAP, if prescribed)
Shift work sleep disorder
How it is usually taken:
For narcolepsy or OSA: 150–250 mg once daily in the morning.
For shift work sleep disorder: 150 mg about 1 hour before the work shift. Taking 250 mg is generally reserved for specific situations based on a doctor's assessment.
Common side effects:
Headache
Nausea
Dizziness
Dry mouth
Anxiety
Difficulty sleeping (insomnia)
Important precautions:
It can increase heart rate or blood pressure in some people.
It may reduce the effectiveness of hormonal contraceptives.
Avoid taking it late in the day, as it may interfere with sleep.
Take it only as prescribed, since it has the potential for misuse or dependence.
Seek medical attention promptly if you develop a severe rash, chest pain, hallucinations, severe mood changes, or signs of an allergic reaction.
If you're taking armodafinil for fatigue, studying, or staying awake without a diagnosed sleep disorder, let me know—that use differs from the approved indications, and I can explain the potential risks and alternatives.