Study to Investigate Pharmacokinetics (PK) of Pramipexole in Pediatric Patients Who Are Individually Optimized to Stable Pramipexole Doses for the Treatment of Idiopathic Restless Legs Syndrome (RLS)
Condition: Restless Legs Syndrome
MeSH terms: Psychomotor Agitation; Restless Legs Syndrome; Syndrome
Intervention: MIRAPEX® - low; MIRAPEX® - medium; MIRAPEX® - high
Intervention MeSH terms: Pramipexole
Phase: Phase 2
Study type: Interventional
Primary purpose: Treatment
Allocation: Non-Randomized
Intervention model: Parallel Assignment
Masking: None (Open Label)
Enrollment: 26.0
Sex: All
Minimum age: 6 Years
Maximum age: 16 Years
Healthy volunteers: No

Summary:

      Study to determine the pharmacokinetics (PK) of pramipexole (PPX) after administration of a
      single dose orally (p.o.) in pediatric patients with the diagnosis of RLS
    

Eligibility criteria:

        Inclusion Criteria:

          1. Male or female patients ages 6 years to 16 years (two age groups, 6 to 11 years and 12
             to 16 years, with the same number of patients if possible)

          2. Diagnosis of idiopathic Restless Legs Syndrome (RLS) according to the Clinical RLS
             criteria of the International Restless Legs Syndrome Study Group (IRLSSG)

             All 4 of the following criteria must be present:

               -  An urge to move the legs, usually accompanied or caused by uncomfortable and
                  unpleasant sensations in the legs. (Sometimes the urge to move is present without
                  the uncomfortable sensations and sometimes the arms or other body parts are
                  involved in addition to the legs.)

               -  The urge to move or unpleasant sensations begin or worsen during periods of rest
                  or inactivity such as lying or sitting

               -  The urge to move or unpleasant sensations are partially or totally relieved by
                  movement, such as walking or stretching, at least as long as the activity
                  continues

               -  The urge to move or unpleasant sensations are worse in the evening or night than
                  during the day or only occur in the evening or night. (When symptoms are very
                  severe, the worsening at night may not be noticeable but must have been
                  previously present.)

          3. Must meet all 4 of the diagnostic criteria for adult RLS (see inclusion criterion No.
             2 above) and either:

               1. The child must be able to describe the leg discomfort in their own words or

               2. The child must have 2 or 3 of the following:

                    -  Sleep disturbance

                    -  Periodic Limb Movements During Sleep (PLMS) index >5 per hour of sleep, or

                    -  A biological parent or sibling with definite RLS

          4. Written informed consent consistent with International Conference on Harmonisation
             (ICH)/ Good Clinical Practice (GCP) and Local Institutional Review Board requirements
             for children obtained prior to any study procedures being performed

          5. Ability and willingness to comply with the study treatment regimen and to attend study
             assessments

          6. Must be on PPX treatment at the same evening maintenance dose for a minimum of 7 days
             prior to entry into this study as determined by the investigator

          7. A patient who is taking PPX but not as an evening maintenance dose may return for a
             repeat screening if the patient can be successfully switched and re-stabilized to an
             evening PPX maintenance dose

        Exclusion criteria:

          1. Any women of childbearing potential having a positive serum pregnancy test at
             screening

          2. Any women of childbearing potential not using a medically accepted method of
             contraceptive (Intra-Uterine Device, oral, implantable, injectable contraceptives and
             estrogen patch, double barrier method [spermicide + diaphragm], or abstinence at the
             discretion of the investigator)

          3. Patients who have a clinically significant renal disease or serum creatinine level
             greater than 1.0 mg/dL at screening

          4. Any of the following lab results at screening:

               -  Hemoglobin (Hgb) below the lower limit of normal (LLN), which is determined to be
                  clinically significant

               -  Basal thyroid stimulating hormone (TSH), triiodothyronine (T3) or thyroxine (T4)
                  clinically significantly (at the investigator's discretion) out of the normal
                  range at screening (if not caused by substitution therapy according to the
                  investigator's opinion)

               -  Patients with any clinically significant abnormalities in laboratory parameters
                  at screening at the investigator's discretion

          5. Other clinically significant metabolic-endocrine, hematological, gastrointestinal
             disease, pulmonary disease (such as severe asthma) which in the opinion of the
             investigator would preclude the patient from participating in this study

          6. History or clinical signs of any neurological disease with potential to secondarily
             cause RLS symptoms

          7. Presence of any other sleep disorder such as Rapid Eye Movement (REM) sleep behavior
             disorder, narcolepsy, or sleep apnea syndrome

          8. History of schizophrenia or any psychotic disorder, history of mental disorders, or
             any present Axis I psychiatric disorder according to the Diagnostic and Statistical
             Manual of Mental Disorders, 4th edition (DSM-IV) requiring any medical therapy

          9. History of/or clinical signs of epilepsy or seizures other than fever-related seizures
             in early childhood

         10. History of/or clinical signs of any malignant neoplasm including suspicious
             undiagnosed skin lesions (which may be melanoma), melanoma, or a history of melanoma

         11. Any other conditions that, in the opinion of the investigator, would interfere with
             the evaluation of the results or constitute a health hazard for the patient

         12. Allergic response to PPX or the inactive ingredients in its tablet formulation

         13. Had previous treatment with dopamine agonists other than PPX within 14 days prior to
             the baseline visit

         14. Had any other medical treatment for RLS besides the study medication within 14 days
             prior to the baseline visit

         15. Had withdrawal symptoms of any medication at screening or at the baseline visit