Key Inclusion Criteria:

• The patient has cancer and is receiving, or is scheduled to receive, taxane chemotherapy (paclitaxel, docetaxel, or albumin-bound paclitaxel), either alone or in combination with other agents.
• The patient experiences an average score of 6 or greater for the daily worst fatigue severity assessment during screening.
• The patient has a life expectancy of at least 6 months.
• The patient is able to use the wrist actigraphy device or provide written documentation during the screening period.
• The patient has stable hemoglobin (≥10 g/dL) throughout the screening period.
• Women of childbearing potential (not surgically sterile or 2 years postmenopausal) must use a medically accepted method of contraception (including abstinence) and must agree to continue use of this method for the duration of the study and for 30 days after participation in the study.
• Men not surgically sterile or who are capable of producing offspring must practice abstinence or use a barrier method of birth control, and must agree to continue use of this method for the duration of the study and for 30 days after participation in the study.
• The patient has adequate hepatic and renal function.
• The patient meets the proposed diagnostic criteria for cancer-related fatigue as included in the International Classifications of Disease, Tenth Revision, Clinical Modification (ICD-10-CM).
• If the patient is taking any other chronic medication which may affect fatigue (e.g., antidepressants, anxiolytics, opioid analgesics), the dose has been stable for at least 4 weeks prior to screening and is expected to remain stable during the study.

Key Exclusion Criteria:

• The patient has any untreated reversible medical condition which may cause fatigue (e.g., metabolic disturbance, infection, endocrine abnormalities).
• The patient has received concurrent stimulant medication (e.g., dextroamphetamine or methylphenidate) during the screening period or double-blind treatment period.
• The patient has received concurrent modafinil during the screening period or double-blind treatment period.
• The patient has any delay in chemotherapy treatment such that the screening period extends beyond 6 weeks.
• The patient has known central nervous system (CNS) involvement by metastatic cancer.
• The patient is receiving concurrent radiation therapy (except for palliative radiation) or treatment with another investigational agent.
• The patient has any serious, uncontrolled, non-malignant medical or psychiatric disorder that could impair the conduct of the study or the safety of the patient.
• The patient is pregnant or lactating.
• The patient has known HIV positivity.
• The patient has nausea and vomiting or any gastrointestinal disorder that is severe enough to interfere with study drug absorption in the opinion of the investigator.
• The patient has uncontrolled pain.
• The patient has a known hypersensitivity to the study medication or ingredients of the study medication.