Modalert Australia, also known as Modafinil, is a medication commonly prescribed to treat excessive daytime sleepiness associated with conditions like narcolepsy, sleep apnea, and shift work disorder. The onset of its effects can vary among individuals. Generally, Modalert is known for its relatively quick onset of action, typically taking effect within 30 to 60 minutes after ingestion. However, individual metabolism and other factors can influence the precise timing. It is important to note that Modalert should be taken as prescribed by a healthcare professional, and its effects can last for several hours, providing increased wakefulness and alertness during that time. It is always advisable to consult a healthcare provider for specific guidance regarding medication usage and timing.