Open Label and Placebo-Controlled Assessment of Sublingual Apomorphine (Kynmobi) as Adjunct Therapy for Patients With Refractory Restless Legs Syndrome

This is an open label, with a short placebo-controlled portion trial using sublingual apomorphine (Kynmobi) in RLS patients inadequately treated with standard therapy, defined by an IRLS > 15 and report of breakthrough symptoms.

At the initial visit, subjects will undergo all baseline and exploratory assessments and be given their first drug dose of 10 mg. They will be monitored for 60 minutes after dose. Subjects orthostatic blood pressure will be taken before ingestion, then 10, 20, 30, and 45 minutes after ingestion. Over the next 4 weeks, subjects will titrate Kynmobi to find optimal dose. Subjects will be instructed to take at least 2 doses before determining if further titration is needed.

At week 4, subjects will return for exploratory assessments. Subjects will be given a randomized study drug packet containing 2 placebos and 2 drug doses. Subjects will be told that 0-4 doses may be placebo or drug. Subjects will have 4 weeks to complete randomization doses. It is anticipated subjects will complete randomization sooner, so they will be given 23 doses of study drug (1 dose per 24 hours for 23 extra days until next visit).

At week 8, subjects will return for exploratory assessments and be given an additional 74 dosed strips. They will return at week 16 for a final visit and undergo exploratory assessments, followed by a safety call two weeks later.

From weeks 0-8, subjects are able to continue their scheduled RLS medications. From weeks 8-16, subjects may make changes to their RLS medications as mutually agreed upon with investigator.