A Study To Examine The Effects Of PF-04958242 On Ketamine-Induced Cognitive Impairment In Healthy Volunteers

This study has been completed.
Information provided by (Responsible Party):
ClinicalTrials.gov Identifier:
First received: December 11, 2012
Last updated: March 7, 2014
Last verified: March 2014
To assess if PF-04958242 can attenuate the ketamine-induced cognitive impairment in verbal learning and memory, episodic memory and spatial working memory in healthy volunteers.

Condition Intervention Phase
Drug: PF-04958242
Drug: Ketamine
Drug: Placebo
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Pharmacodynamics Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Basic Science
Official Title: A Randomized, Subject And Investigator Blinded, Sponsor Open Placebo Controlled, 2 Way, Crossover Phase 1b Study To Examine The Effects Of PF-04958242 On Ketamine Induced Cognitive Impairment In Healthy Male Volunteers

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Test score on the Hopkins Verbal Learning Test - Immediate Recall [ Time Frame: Day 5 ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Test score on the Weschler Digit Span Test [ Time Frame: Day 5 ] [ Designated as safety issue: No ]
  • Test score on the CogState N-back test [ Time Frame: Day 5 ] [ Designated as safety issue: No ]
  • Test score on the CogState Spatial Working memory test [ Time Frame: Day 5 ] [ Designated as safety issue: No ]
  • Test score on the CogState One Card Learning test [ Time Frame: Day 5 ] [ Designated as safety issue: No ]
  • Test score on the Hopkins Verbal Learning test - Delayed Recall [ Time Frame: Day 5 ] [ Designated as safety issue: No ]
  • Retrospective rating on the Positive and Negative Syndrome Scale -modified scale` [ Time Frame: Day 5 ] [ Designated as safety issue: No ]

Enrollment: 29
Study Start Date: December 2012
Study Completion Date: February 2014
Primary Completion Date: February 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: PF-04958242
PF-04958242 and ketamine
Drug: PF-04958242
PF-04958242, 0.35 mg orally administered capsule on Day 1 and 0.25 mg orally administered capsule on Days 2 - 5
Drug: Ketamine
At 60 minutes after the 0.25 mg dose of PF-04958242 on Day 5, Ketamine (0.23 mg/kg over 1 minute, followed by a maintenance rate of 0.58 mg/kg/hr for 75 minutes) will be infused.
Placebo Comparator: Placebo
Placebo and ketamine
Drug: Placebo
Placebo capsule orally administered on Days 1 - 5
Drug: Ketamine
At 60 minutes after Placebo on Day 5, Ketamine (0.23 mg/kg over 1 minute, followed by a maintenance rate of 0.58 mg/kg/hr for 75 minutes) will be infused.


Ages Eligible for Study:   21 Years to 45 Years
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy male subjects 21 - 45 years old.
  • Able to read and write English as primary language.
  • Subjects who are willing to comply with study procedures.

Exclusion Criteria:

  • History of any substance abuse or dependence disorder meeting DSM-IV criteria and/or by SCID-NP within the past 12 months, with the exception of nicotine.
  • Known sensitivity to ketamine
  • Any history of DSM-IV Axis I psychiatric disorders, determined by SCID-NP interview or diagnoses in the view of the investigator.
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01749098

United States, Connecticut
Pfizer Investigational Site
New Haven, Connecticut, United States, 06511
Pfizer Investigational Site
West Haven, Connecticut, United States, 06516
Sponsors and Collaborators
Study Director: Pfizer CT.gov Call Center Pfizer
  More Information

Additional Information:
Responsible Party: Pfizer
ClinicalTrials.gov Identifier: NCT01749098     History of Changes
Other Study ID Numbers: B1701013 
Study First Received: December 11, 2012
Last Updated: March 7, 2014
Health Authority: United States: Food and Drug Administration

Keywords provided by Pfizer:
healthy volunteers

Additional relevant MeSH terms:
Cognition Disorders
Delirium, Dementia, Amnestic, Cognitive Disorders
Mental Disorders
Anesthetics, Dissociative
Anesthetics, General
Anesthetics, Intravenous
Central Nervous System Agents
Central Nervous System Depressants
Excitatory Amino Acid Agents
Excitatory Amino Acid Antagonists
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Sensory System Agents
Therapeutic Uses

ClinicalTrials.gov processed this record on May 01, 2016