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| ID | Type | Description | Link |
|---|---|---|---|
| MK-3814-023 | Other Identifier | Merck Study Number |
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| Name | Class |
|---|---|
| Oregon Health and Science University | OTHER |
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This is a randomized, placebo-controlled, 3-period crossover, balanced, single-site, third party-blind study of preladenant (SCH 420814) in participants with Parkinson disease (PD) to be conducted in conformance with Good Clinical Practices. This trial will investigate the effects of single doses of preladenant and placebo on the dyskinesia and antiparkinsonian actions of a levodopa infusion. The study will examine 10 mg ("low dose") or 100 mg ("high dose") study drug, given as single, oral administrations in conjunction with intravenous (IV) levodopa infusion and oral carbidopa.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| SCH 420814 10 mg→SCH 420814 100 mg→Placebo | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
|
| SCH 420814 100 mg→Placebo→ SCH 420814 10 mg | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
|
| Placebo→SCH 420814 10 mg→SCH 420814 100 mg | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| SCH 420814 10 mg | Drug | one 10-mg capsule, orally, at hour 0 of treatment period |
|
| Measure | Description | Time Frame |
|---|---|---|
| Mean Peak Dyskinesia Score | Dyskinesia was scored on a scale of 0 (absent), 1 (mild) , 2 (moderate), 3 (severe) and 4 (incapacitating) for seven body parts (face, neck, trunk, each arm and each leg) based on the worse dyskinesia noted during the entire measurement time. Scores were assessed at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The dyskinesia score was the sum of the scores for the seven body parts. The peak dyskinesia score was recorded for each participant regardless of what timepoint the score was achieved. The total possible score for an individual at each timepoint could range from 0 to 28 with higher scores indicating greater effects of the dyskinesia. The mean peak dyskinesia score was calculated using the individual peak values. | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
| Measure | Description | Time Frame |
|---|---|---|
| Mean Peak Finger Tapping Score | Tapping was measured with two manual counters with keys that were depressed to register a count. The participant alternately tapped each counter using the index finger of the more affected hand for 60 seconds and was not allowed to use more than one finger to tap. The participant was instructed to tap as rapidly as possible while being timed for 60 seconds. The counts were recorded for the two counters at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The peak tapping score was recorded for each participant regardless of what timepoint the score was achieved. The mean peak finger tapping score was calculated using the individual peak values. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Medical Director | Merck Sharp & Dohme LLC | Study Director |
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| ID | Title | Description |
|---|---|---|
| FG000 | SCH 420814 10 mg→SCH 420814 100 mg→Placebo | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| FG001 | SCH 420814 100 mg→Placebo→ SCH 420814 10 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| FG002 | Placebo→SCH 420814 10 mg→SCH 420814 100 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| FG003 | SCH 420814 10 mg→ Placebo→ SCH 420814 100 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| FG004 | SCH 420814 100 mg→ SCH 420814 10 mg→Placebo | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| FG005 | Placebo→ SCH 420814 100 mg→SCH 420814 10 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period 1 |
| |||||||||||||
| Period 2 |
| |||||||||||||
| Period 3 |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | SCH 420814 10 mg→SCH 420814 100 mg→Placebo | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Mean |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Mean Peak Dyskinesia Score | Dyskinesia was scored on a scale of 0 (absent), 1 (mild) , 2 (moderate), 3 (severe) and 4 (incapacitating) for seven body parts (face, neck, trunk, each arm and each leg) based on the worse dyskinesia noted during the entire measurement time. Scores were assessed at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The dyskinesia score was the sum of the scores for the seven body parts. The peak dyskinesia score was recorded for each participant regardless of what timepoint the score was achieved. The total possible score for an individual at each timepoint could range from 0 to 28 with higher scores indicating greater effects of the dyskinesia. The mean peak dyskinesia score was calculated using the individual peak values. | All participants who received at least 1 dose of study drug and had available data for endpoint. Results pooled by study drug and not by randomly assigned sequence. | Posted | Mean | Standard Deviation | Score on a scale | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
|
up to 70 days (up to 14 days after last dose of study drug)
Safety population included all participants who received at least 1 dose of study drug. Adverse events are reported by study drug administered at time of the event and not by randomly assigned sequence.
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | SCH 420814 10 mg | Participants who received single oral dose of SCH 420814 10 mg in either period 1, 2, or 3 regardless of randomly assigned treatment sequence |
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| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| ATRIAL FIBRILLATION | Cardiac disorders | MedDRA version 13.0 | Systematic Assessment |
Not provided
| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Senior Vice President, Global Clinical Development | Merck Sharp & Dohme Corp. | 1-800-672-6372 | ClinicalTrialsDisclosure@merck.com |
| ID | Term |
|---|---|
| D010300 | Parkinson Disease |
| ID | Term |
|---|---|
| D020734 | Parkinsonian Disorders |
| D001480 | Basal Ganglia Diseases |
| D001927 | Brain Diseases |
| D002493 | Central Nervous System Diseases |
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| ID | Term |
|---|---|
| C539997 | 2-(2-furanyl)-7-(2-(4-(4-(2-methoxyethoxy)phenyl)-1-piperazinyl)ethyl)-7H-pyrazolo(4,3-e)(1,2,4)triazolo(1,5-c)pyrimidine-5-amine |
| D007980 | Levodopa |
| D002230 | Carbidopa |
| ID | Term |
|---|---|
| D004295 | Dihydroxyphenylalanine |
| D002395 | Catecholamines |
| D000588 | Amines |
| D009930 | Organic Chemicals |
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|
| SCH 420814 10 mg→ Placebo→ SCH 420814 100 mg | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
|
| SCH 420814 100 mg→ SCH 420814 10 mg→Placebo | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
|
| Placebo→ SCH 420814 100 mg→SCH 420814 10 mg | Experimental | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
|
| SCH 420814 100 mg | Drug | single oral dose of four SCH 420814 25-mg capsules at hour 0 of treatment period |
|
| Placebo | Drug | Placebo capsule, oral, at hour 0 of treatment period |
|
| Levodopa | Drug | levodopa intravenous (IV) infusion (1 mg/kg body weight) was beginning 1 hour after study drug administration and continued for 2 hours |
|
| Carbidopa | Drug | one 25-mg table, orally, at hours 0, 2 and 4 of each treatment period |
|
| Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
| Mean Peak Tremor Score | Tremor was scored on a scale of 0 (absent), 1 (mild, 2 (moderate), 3 (severe) and 4 (incapacitating) for seven body parts (face, neck, trunk, each arm and each leg) based on the worse tremor observed during the time spent with participant while taking other study measurements(vital signs, drawing samples, performing the tapping and walking tasks). Scores were assessed at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The tremor score was the sum of scores for seven body parts. The peak tremor score was recorded for each participant regardless of what timepoint the score was achieved. The total possible score for an individual at each timepoint could range from 0 to 28 with higher scores indicating more effects of the tremors. The mean peak tremor score was calculated using the individual peak values. | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
| Mean Peak Walking Speed | Walking speed assessment began with the participant being seated in an armless chair. Then while being timed, the participant stood up with their arms crossed on their chest and walked 6 meters, turned around, returned to the chair and sat. Timing was stopped when the participant's buttocks hit the chair and the total time was recorded. If the participant could not arise in 60 seconds, 60 seconds was entered in this line of the report form and the participant was tested again but allowed to push off to get out of the chair. Sixty seconds was the maximum time allowed to complete the walking assessment, thus 60 seconds was recorded as the time if they could not complete the task within this time limit. Walking speed was assessed at Hours 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7.0 and 8. The peak walking speed was recorded for each participant regardless of what timepoint the score was achieved. The mean peak walking speed was calculated using the individual peak values. | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
| COMPLETED |
|
| NOT COMPLETED |
|
| COMPLETED |
|
| NOT COMPLETED |
|
| BG001 | SCH 420814 100 mg→Placebo→ SCH 420814 10 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| BG002 | Placebo→SCH 420814 10 mg→SCH 420814 100 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| BG003 | SCH 420814 10 mg→ Placebo→ SCH 420814 100 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| BG004 | SCH 420814 100 mg→ SCH 420814 10 mg→Placebo | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| BG005 | Placebo→ SCH 420814 100 mg→SCH 420814 10 mg | Participants were to receive their assigned experimental treatment based on randomly assigned treatment sequence at Hour 0 following an overnight withdrawal of their antiparkinsonian medications of each treatment period. The levodopa infusion was to be started at Hour 1 and was to run for 2 hours. The participants were to also receive 25 mg of carbidopa at the following times: Hours 0, 2, and 4. Treatment periods were to be separated by at least 7 days but not more than 28 days washout between each dose. |
| BG006 | Total | Total of all reporting groups |
| Years |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| OG000 | SCH 420814 10 mg | Participants who received single oral dose of SCH 420814 10 mg in either period 1, 2, or 3 regardless of randomly assigned treatment sequence |
| OG001 | SCH 420814 100 mg | Participants who received single oral dose of SCH 420814 100 mg (four 25 mg capsules) in either period 1, 2, or 3 regardless of randomly assigned treatment |
| OG002 | Placebo | Participants who received placebo in either period 1, 2, or 3 regardless of randomly assigned treatment |
|
|
| Secondary | Mean Peak Finger Tapping Score | Tapping was measured with two manual counters with keys that were depressed to register a count. The participant alternately tapped each counter using the index finger of the more affected hand for 60 seconds and was not allowed to use more than one finger to tap. The participant was instructed to tap as rapidly as possible while being timed for 60 seconds. The counts were recorded for the two counters at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The peak tapping score was recorded for each participant regardless of what timepoint the score was achieved. The mean peak finger tapping score was calculated using the individual peak values. | All participants who received at least 1 dose of study drug and had available data for endpoint. Results pooled by study drug and not by randomly assigned sequence. | Posted | Mean | Standard Deviation | taps per 60 seconds | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
|
|
|
| Secondary | Mean Peak Tremor Score | Tremor was scored on a scale of 0 (absent), 1 (mild, 2 (moderate), 3 (severe) and 4 (incapacitating) for seven body parts (face, neck, trunk, each arm and each leg) based on the worse tremor observed during the time spent with participant while taking other study measurements(vital signs, drawing samples, performing the tapping and walking tasks). Scores were assessed at Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0. The tremor score was the sum of scores for seven body parts. The peak tremor score was recorded for each participant regardless of what timepoint the score was achieved. The total possible score for an individual at each timepoint could range from 0 to 28 with higher scores indicating more effects of the tremors. The mean peak tremor score was calculated using the individual peak values. | All participants who received at least 1 dose of study drug and had available data for endpoint. Results pooled by study drug and not by randomly assigned sequence. | Posted | Mean | Standard Deviation | Score on a scale | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
|
|
|
| Secondary | Mean Peak Walking Speed | Walking speed assessment began with the participant being seated in an armless chair. Then while being timed, the participant stood up with their arms crossed on their chest and walked 6 meters, turned around, returned to the chair and sat. Timing was stopped when the participant's buttocks hit the chair and the total time was recorded. If the participant could not arise in 60 seconds, 60 seconds was entered in this line of the report form and the participant was tested again but allowed to push off to get out of the chair. Sixty seconds was the maximum time allowed to complete the walking assessment, thus 60 seconds was recorded as the time if they could not complete the task within this time limit. Walking speed was assessed at Hours 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7.0 and 8. The peak walking speed was recorded for each participant regardless of what timepoint the score was achieved. The mean peak walking speed was calculated using the individual peak values. | All participants who received at least 1 dose of study drug and had available data for endpoint. Results pooled by study drug and not by randomly assigned sequence. | Posted | Mean | Standard Deviation | Seconds | Hours 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0 and 8.0 of each treatment period |
|
|
|
| 0 |
| 12 |
| 5 |
| 12 |
| EG001 | SCH 420814 100 mg | Participants who received single oral dose of SCH 420814 100 mg (four 25 mg capsules) in either period 1, 2, or 3 regardless of randomly assigned treatment | 0 | 12 | 4 | 12 |
| EG002 | Placebo | Participants who received single oral dose of placebo in either period 1, 2, or 3 regardless of randomly assigned treatment | 0 | 12 | 4 | 12 |
| INFUSION SITE EXTRAVASATION | General disorders | MedDRA version 13.0 | Systematic Assessment |
|
| FALL | Injury, poisoning and procedural complications | MedDRA version 13.0 | Systematic Assessment |
|
| THERMAL BURN | Injury, poisoning and procedural complications | MedDRA version 13.0 | Systematic Assessment |
|
| ATAXIA | Nervous system disorders | MedDRA version 13.0 | Systematic Assessment |
|
| DYSKINESIA | Nervous system disorders | MedDRA version 13.0 | Systematic Assessment |
|
| DYSTONIA | Nervous system disorders | MedDRA version 13.0 | Systematic Assessment |
|
| HEADACHE | Nervous system disorders | MedDRA version 13.0 | Systematic Assessment |
|
| ANXIETY | Psychiatric disorders | MedDRA version 13.0 | Systematic Assessment |
|
| HYPERTENSION | Vascular disorders | MedDRA version 13.0 | Systematic Assessment |
|
The investigator agrees not to publish or publicly present any interim results of the trial without the prior written consent of the sponsor. The investigator further agrees to provide to the sponsor 45 days prior to submission for publication or presentation, review copies of abstracts or manuscripts for publication that report any results of the trial.
| D009422 | Nervous System Diseases |
| D009069 | Movement Disorders |
| D000080874 | Synucleinopathies |
| D019636 | Neurodegenerative Diseases |
| D002396 |
| Catechols |
| D010636 | Phenols |
| D001555 | Benzene Derivatives |
| D006841 | Hydrocarbons, Aromatic |
| D006844 | Hydrocarbons, Cyclic |
| D006838 | Hydrocarbons |
| D010649 | Phenylalanine |
| D024322 | Amino Acids, Aromatic |
| D000598 | Amino Acids, Cyclic |
| D000596 | Amino Acids |
| D000602 | Amino Acids, Peptides, and Proteins |
| D014443 | Tyrosine |
| D008750 | Methyldopa |
| D006834 | Hydrazines |