A Two-Part Study to Assess the Safety, Tolerability, Pharmacokinetics and Sleep Latency Effects of MK-6552 in Participants With Narcolepsy Type 1

The purpose of this study is to evaluate the safety, efficacy, pharmacokinetics (PK), and pharmacodynamics (PD) of MK-6552 in participants with Narcolepsy Type 1 (NT1). Part 1 will evaluate safety, tolerability, and PK of MK-6552 after administration of ascending doses in a single day to support a dose level decision for Part 2. Part 2 will investigate the PD of MK-6552 after single-day and multiple-day administration. Participants who complete Part 1 and demonstrate that they are able to tolerate at least one dose level of MK-6552 will participate in Part 2.

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