If you're using Modalert Tablet to treat sleep disorders for work or studying, then take 200 mg prior to starting your work. Modvigil can treat illnesses with effectiveness similar to Modalert 200 Australia, which includes sleep disorder treatments such as OSA and work-related problems as well as narcolepsy. The chemical found in Modvigil 200mg is known as modafinil, which is a component of nootropic medications.