For most people, the half-life of Modalert 100 mg is between 10 and 12 hours, however, others have reported that it lasted up to 15 hours for them. When it comes to modafinil metabolism, the liver is in charge. Inactive metabolites excrete urine as a waste product. Addiction is possible with Modalert 100mg.nnModalert 100 Tablet has the potential to be misused if used for a long time. Patients with a history of substance abuse are more likely to develop an addiction to Modalert 100 mg Tablet.