Modvigil 200 Australia typically begins to take effect within 30 to 60 minutes after ingestion. Its wakefulness-promoting effects usually peak within 2 hours, helping improve alertness and reduce excessive daytime sleepiness. The medication can remain active in the body for up to 12–15 hours, providing sustained cognitive and wakefulness benefits. However, the onset of effects may vary depending on individual factors like metabolism, dosage, and overall health. It’s important to take Modvigil as prescribed by a healthcare provider for optimal results.