Preladenant
Drug1 mg BID capsules
Other names: SCH 420814
NCT Number: NCT00406029
The purpose of the study is to assess the efficacy and safety of a range of doses of SCH 420814 (preladenant) when used together with a stable dose of L-dopa/dopa decarboxylase inhibitor to treat Parkinson's disease. In this study, we will be comparing 3 doses (1 mg, 2 mg, and 5 mg taken twice a day) of preladenant with placebo (sugar pill). Following an Interim Analysis (temporary hold for new enrollment-ongoing subjects will continue on treatment) to review drug safety, a new dose group of 10 mg (taken twice a day) may be added.
Approximately 160 participants will be randomized in this study in approximately 22 study centers worldwide for the first part of this study. Following the Interim Analysis, 40 new participants may be added, for a total of 200 participants. The study is double blind, which means neither you nor your study doctor will know whether you are receiving the study medication or placebo.
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Notify Me30 year and older
All sexes
Interventional
Phase 2
Healthy volunteers accepted: No
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
Note: Acceptable methods of birth control include oral or injectable hormonal contraceptive, medically prescribed intrauterine device (IUD), and double-barrier method (eg, condom in combination with spermicide). Bilateral tubal ligation is an acceptable method of birth control for this study.
Exclusion criteria
1 mg BID capsules
Other names: SCH 420814
BID capsules
Participants must receive L-dopa as part of their usual ongoing treatment for Parkinson's Disease. L-dopa is often administered concomitantly with a dopa decarboxylase inhibitor (e.g., carbidopa).
Participants may also receive other drugs as part of their usual ongoing treatment for Parkinson's Disease, such as dopamine agonists (e.g., pramipexole) and/or the catechol-O-methyl transferase (COMT) inhibitor entacapone.
Time frame: Baseline (Week -1) and up to 12 weeks
"Off" time refers to periods of inadequate control of Parkinson disease symptoms (worsening or presence of symptoms). For baseline and the 12 weeks treatment period, hours spent in the "off" state during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. Change from baseline in least squares (LS) means and pooled standard deviation (SD) were obtained from an analysis of covariance (ANCOVA) model with effect for treatment and baseline covariate. A negative change from baseline signifies less time spent in the "off" state.
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
"Off" time refers to periods of inadequate control of Parkinson disease symptoms (worsening or presence of symptoms). Hours spent in the "off" state during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with treatment effect and baseline covariate. A negative change from baseline signifies less time spent in the "off" state.
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
"On" time refers to periods of adequate control of Parkinson disease symptoms (symptoms better or absent). Hours spent in the "on" state during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with effect for treatment and baseline covariate. A positive (+) change from baseline signifies more time spent in the "on" state.
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
"On" time refers to periods of adequate control of Parkinson disease symptoms (better/absent). Dyskinesias refers to maintenance therapy (e.g., L-dopa) side effects of chorea, dystonia, or in combination. Hours spent in the "on" state with no dyskinesias during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means & pooled SD were obtained from an ANCOVA model with effect for treatment & baseline covariate. A (+) change from baseline signifies more time spent in the "on" state (no dyskinesias).
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
"On" time refers to periods of adequate control of Parkinson disease symptoms (better/absent). Troublesome dyskinesias refers to maintenance therapy side effects of chorea, dystonia, or in combination that impair function. Hours spent in the "on" state with troublesome dyskinesias during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means & pooled SD were obtained using ANCOVA with treatment effect & baseline covariate. A (+) change from baseline signifies more time spent in the "on" state (troublesome dyskinesias).
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
"On" time refers to periods of adequate control of Parkinson disease symptoms (better/absent). Troublesome dyskinesias refers to maint. therapy side effects of chorea, dystonia, or in combination that impair function. Hours spent in the "on" state without troubles. dyskinesias during awake time were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means & pooled SD were obtained using ANCOVA with treatment effect & baseline covariate. A (+) change from baseline signifies more time spent in the "on" state (without troubles. dyskinesias).
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
Dyskinesias refers to maintenance therapy side effects of chorea, dystonia, or in combination (that occur in the ON time). Hours spent with dyskinesias (troublesome and not troublesome) were recorded in half-hour time intervals using a daily diary at least 3 full days before scheduled visits. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means & pooled SD were obtained using ANCOVA with treatment effect & baseline covariate. A negative change from baseline signifies less time spent with dyskinesia.
Time frame: Baseline (Week -1) and Weeks 2, 4, 6, 8, 10, 12
Hours spent in the sleep state were recorded using a daily diary at least 3 full days before scheduled visit. For baseline, the 24-hour average over 3 consecutive days was derived for Week -1. For endpoint, the 24-hour average was derived for the last available 3 consecutive days with postbaseline data available during the treatment period. For treatment period visits, the 24-hour average was derived for the final 3 consecutive days with data available for the particular visit. Change from baseline in LS means & pooled SD were obtained using ANCOVA with treatment effect & baseline covariate. A positive change from baseline means more time asleep and a negative change means less time asleep.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 2
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 2) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 2 would be reported as BL >2 to WK2 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 4
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 4) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 4 would be reported as BL >2 to WK4 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 6
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 6) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 6 would be reported as BL >2 to WK6 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 8
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 8) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 8 would be reported as BL >2 to WK8 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 10
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 10) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 10 would be reported as BL >2 to WK10 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Week 12
Sleep attacks are uncontrollable episodes of sleep that occur during the daytime lasting a few seconds to several minutes. A questionnaire to determine sleep attacks over the prior 2 week period was administered at baseline and at 2-week intervals during the treatment period. Frequency of sleep attacks over the two-week treatment period intervals were tabulated in relation to the baseline assessment. Results are presented as participants showing the respective change in frequency of sleep attacks at baseline to the week of assessment (Week 12) (as reported by the participant). For example, someone who had >2 sleep attacks at BL who had a decrease of 1-2 by Week 12 would be reported as BL >2 to WK12 1-2. BL = baseline. WK = week.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, 12
The UPDRS is a frequently used multi-item 4-part questionnaire designed to assess various aspects of Parkinson's disease severity. A total of 42 items are assessed divided across Parts 1 to 4. Part 1 assesses mentation (4 items scored from 0 [best] to 4 [worst]; total range 0-16). Assessments were obtained at baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, and 12. For endpoint, the last postbaseline visit while on study medication was used. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with effect for treatment and baseline covariate. Negative change from baseline indicates a decrease in severity.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, 12
The UPDRS is a frequently used multi-item 4-part questionnaire designed to assess various aspects of Parkinson's disease severity. A total of 42 items are assessed divided across Parts 1 to 4. Part 2 assesses daily living (13 items scored from 0 [best] to 4 [worst]; total range 0-52). Assessments were obtained at baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, and 12. For endpoint, the last postbaseline visit while on study medication was used. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with effect for treatment and baseline covariate. Negative change from baseline indicates a decrease in severity.
Time frame: Baseline (predose Day 1) and 1 hour postdose at Weeks 2, 4, 6, 8, 10, 12
The UPDRS is a frequently used multi-item 4-part questionnaire designed to assess various aspects of Parkinson's disease severity. A total of 42 items are assessed divided across Parts 1 to 4. The Part 3 subscale assesses motor function across 14 categories for 27 items. Scores for each item range from 0 (best) to 4 (worst) with a total range of 0-108. Assessments were obtained at baseline (predose Day 1) and 1 hour postdose at Weeks 2, 4, 6, 8, 10, and 12. For endpoint, the last postbaseline visit while on study medication was used. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with effect for treatment and baseline covariate. Negative change from baseline indicates a decrease in severity.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, 12
The UPDRS is a frequently used multi-item 4-part questionnaire designed to assess various aspects of Parkinson's disease severity. A total of 42 items are assessed divided across Parts 1 to 4. The Part 3 subscale assesses motor function across 14 categories for 27 items. Scores for each item range from 0 (best) to 4 (worst) with a total range of 0-108. Assessments were obtained at baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, and 12. For endpoint, the last postbaseline visit while on study medication was used. Change from baseline in LS means and pooled standard deviation were obtained from an ANCOVA model with effect for treatment and baseline covariate. Negative change from baseline indicates a decrease in severity.
Time frame: Baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, 12
The UPDRS is a frequently used multi-item 4-part questionnaire designed to assess various aspects of Parkinson's disease severity. A total of 42 items are assessed divided across Parts 1 to 4. The Part 4 subscale assesses complications of therapy over the past week for a total of eleven question items. The first three questions and question 8 are rated from 0 (best) to 4 (worst), and the remaining seven questions are simple no (0) / yes (1) questions. The total subscale score ranges from 0 to 23. Assessments were obtained at baseline (predose Day 1) and 2 hours postdose at Weeks 2, 4, 6, 8, 10, and 12. For endpoint, the last postbaseline visit while on study medication was used. Change from baseline in LS means and pooled SD were obtained from an ANCOVA model with effect for treatment and baseline covariate. Negative change from baseline indicates a decrease in severity.
Merck Sharp & Dohme LLC
Industry
A Phase 2, 12-Week, Double-Blind, Dose-Finding, Placebo-Controlled Study to Assess the Efficacy and Safety of a Range of SCH 420814 Doses in Subjects With Moderate to Severe Parkinson's Disease Experiencing Motor Fluctuations and Dyskinesias
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View the official ClinicalTrials.gov record (opens in a new tab)This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.
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