Inclusion Criteria:  Adults ages 18-65 years of age. A diagnosis of childhood-onset ADHD, meeting the Diagnostic and Statistcal Manual-5 (DSM-5) criteria for ADHD in adulthood, including at least 5 current symptoms of inattentive or impulsive-hyperactive traits, and childhood onset by age 12, defined as two symptoms of inattentive or of impulsive/hyperactive traits by the age of 12. A score of 20 or more on the Adult ADHD Investigator Symptom Report Scale (AISRS)  Exclusion Criteria:  Individuals with known renal insufficiency or renal impairment. A history of intolerance to solriamfetol Pregnant or nursing females, and individuals unwilling to use adequate contraceptive methods to avoid conception while they are receiving study agent and for 1 month after the last dose of study agent. For female subjects of childbearing potential adequate contraceptive methods will include: a medically acceptable form of birth control (such as male or female condoms with or without spermicidal agent, diaphragm or cervical cap with spermicide, medically prescribed intrauterine device, hormonal contraceptives like birth control pills, or abstinence). For male subjects this will include use of male condom, being status post vasectomy at least 4 months prior to initiation of study drug exposure, or abstinence during the study. A known unstable major medical illness including hepatic, renal, gastroenterological, respiratory, cardiovascular (including hypertension ≥ 140/90 mmHg), endocrinologic (e.g. thyroid), neurologic (e.g. seizure), immunologic, hematologic, or psychiatric (including an active substance use disorder, psychosis, bipolar disorder, major depression) disorder. Any medical condition that the Principal Investigator (PI) believes will be exacerbated by study participation. A history of cancer (except localized skin cancer without metastases or in situ cervical cancer) within 5 years prior to screening. A known history of narrow-angle glaucoma. Current (within 3 months) DSM-V criteria for abuse or dependence with any psychoactive substance other than nicotine. Multiple adverse drug reactions, defined as previous moderate to severe adverse experiences while on two or more chemically unrelated compounds, where these reactions were unpredictable from the known pharmacology of the drug. Any other concomitant medication with primarily central nervous system activity, except subjects will be allowed on selective serotonin reuptake inhibitors, and rare (predicted to be less than twice a week) use of benzodiazepines or sedative-hypnotics. Current use of a monamine oxidease Inhibitor or use within the past two weeks. Concomitant medications with high potential for dopaminergic or sympathomimetic effects. Investigator and his/her immediate family; defined as the investigator's spouse, parent, child, grandparent, or grandchild.  14, Reasonable suspicion of inability, in the judgement of the investigator, to appropriately monitor experiences during the study and take steps to report these experiences or respond in a manner preserving personal health and safety.  15. If clinically appropriate, any subjects taking medication exclusionary to the study (including agents used for management of ADHD) must be tapered off this medication prior to baseline visit for the length of 5 half-lives of the medication, corresponding to 95% of the agent leaving the participant's system), plus several days or otherwise sufficient period of time to allow assessment of eligibility for participation off medication.  16. Any condition, including a moderate to severe untreated sleep disorder or other mental health disorder, that renders inability, in the investigator's judgement, to determine whether ADHD symptoms are primarily due to ADHD.