Modafinil in the body

Distribution: Vd: 0.9 L/kg

Protein binding: 60%, primarily to albumin

Metabolism: Hepatic; multiple pathways including CYP3A4

Half-life elimination: Effective half-life: 15 hours; Steady-state: 2-4 days

Time to peak, serum: 2-4 hours

Excretion: Urine (as metabolites, <10% as unchanged drug)

Can I take Modafinil if I’m on hormonal birth controls?

Yes, but Modafinil can affect birth control pills and how they work. Discuss this issue with your doctor.

Can I take Modafinil if I’m pregnant or nursing?

No, but ask your doctor.

Are there side effects?

See page on side effects


Do they prescribe Modafinil to kids?

Modafinil has not been approved by the Food and Drug Administration for pediatric use.

Addition Questions

It was thought that modafinil had a low additive potential, especially compared to other stimulants. A recent study has cast doubt on that view and found that modafinil affects the same dopamine system in the brain that other drugs affect. So it may be physically addictive. In any case, use the drug only if you need it and are under a doctor’s care.