A 12-Week, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study to Evaluate the Efficacy and Safety of CEP-10953 (150 and 250 mg/Day) as Treatment for Adults With Excessive Sleepiness Associated With Narcolepsy

Study start date: March 1, 2004

Diagnosis and Criteria for Inclusion: Patients are included in the study if all of the following criteria are met: * Written informed consent is obtained * The patient is an outpatient, man or woman of any ethnic origin, 18 to 65 years of age (inclusive) * The patient has a complaint of excessive sleepiness * The patient has a current diagnosis of narcolepsy according to ICSD criteria. * The patient is in good health as determined by a medical and psychiatric history, physical examination, electrocardiogram (ECG), and serum chemistry, hematology, and urinalysis. * Women must be surgically sterile, 2 years postmenopausal, or, if of child-bearing potential, using a medically accepted method of birth control (ie, barrier method with spermicide, steroidal contraceptive \[oral, implanted, and Depo-Provera contraceptives must be used in conjunction with a barrier method\], or intrauterine device \[IUD\]) and agree to continued use of this method for the duration of the study. * The patient has a mean sleep latency of 6 minutes or less as determined by the Multiple Sleep Latency Test (MSLT) (performed at 0900, 1100, 1300, and 1500). * The patient has a CGI-S (Clinical Global Impression of Severity of Illness) rating of 4 or more. * The patient does not have any medical or psychiatric disorders that could account for the excessive daytime sleepiness. * The patient is able to complete self rating scales and computer-based testing. * The patient is willing and able to comply with study restrictions and to attend regularly scheduled clinic visits as specified in this protocol. Criteria for Exclusion: Patients are excluded from participating in this study if 1 or more of the following criteria are met. The patient: * has any clinically significant, uncontrolled medical or psychiatric conditions (treated or untreated) * has a probable diagnosis of a current sleep disorder other than narcolepsy * consumed caffeine including coffee, tea and/or other caffeine containing beverages or food averaging more than 600 mg of caffeine per day * used any prescription drugs disallowed by the protocol or clinically significant use of over the-counter (OTC) drugs within 7 days before the second screening visit * has a history of alcohol, narcotic, or any other drug abuse as defined by the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association, 4th Edition (DSM IV) * has a positive UDS at the screening visit, without medical explanation * has a clinically significant deviation from normal in the physical examination * is a pregnant or lactating woman. (Any woman becoming pregnant during the study will be withdrawn from the study.) * has used an investigational drug within 1 month before the screening visit * has any disorder that may interfere with drug absorption, distribution, metabolism, or excretion (including gastrointestinal surgery) * has a known clinically significant drug sensitivity to stimulants or modafinil