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Phosphodiesterase (PDE) Inhibitors Effect on Cognitive Deficits Associated to Schizophrenia

Information source: University of Copenhagen
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Schizophrenia; Cognitive Deficits

Intervention: Papaverine or placebo (Drug)

Phase: Phase 0

Status: Terminated

Sponsored by: University of Copenhagen

Official(s) and/or principal investigator(s):
Birte Glenthøj, Professor, Study Director, Affiliation: University of Copenhagen
Mikkel E Sørensen, PHD student, Principal Investigator, Affiliation: University of Copenhagen
Bob Oranje, PHD, Study Director, Affiliation: Center for Neuropsychiatric Schizophrenia Research


Phosphodiesterase (PDE) inhibitors represent a new group of potential antipsychotic compounds currently under development. One of these is papaverine, an inhibitor of the PDE 10 family. The class of PDE10 inhibitors have been reported as possible candidates in the treatment of schizophrenia, and may prove an attractive antipsychotic alternative due to the many side-effects of the currently available antipsychotics. It has been proposed from preclinical studies that PDE10 inhibitors have the potential to reduce cognitive deficits in schizophrenia and these findings need to be confirmed in a human population, in view of the fact that no other currently registered drug posses these unique properties. The currently proposed project is designed to investigate whether the PDE10 inhibitor Papaverine indeed have the capacity to reduce cognitive deficits in schizophrenia patients. In order to accomplish this effect, Papaverine will be investigated in schizophrenia, with regards to symptomatology, hemodynamic, neurocognition and early information-processing.

Clinical Details

Official title: PDE Inhibitors Effect on Cognitive Deficits Associated to Schizophrenia

Study design: Intervention Model: Single Group Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Health Services Research

Primary outcome: psychophysiology

Secondary outcome: Hemodynamic changes

Detailed description: The study has a double blind, balanced crossover design. Randomized, half of the subjects will be given Papaverine (PDE10 inhibitor, 300 mg orally) in the first session followed by placebo in the second, and the other half will be treated in the reverse order. There is a minimum of one month between the two test-sessions. After each of the two treatments, the subjects will be tested with both a psychophysiological (the Copenhagen Psychophysiological Test-Battery) and neuropsychological test-battery (tests from the Cambridge Neuropsychological Test Automated Battery, or "CANTAB"). The project has three phases: In the first phase 10 healthy subjects will be included to determine the kinetics of Papaverine-contained release capsules ; in the second phase 30 schizophrenia patients and 30 healthy subjects will be included to determine the impact on cognitive and sensory gating related deficits; Finally 10 Healthy subjects will be included to determine the effect of Papaverine on hemodynamical parameters by the means magnetic resonance scannings.


Minimum age: 18 Years. Maximum age: 60 Years. Gender(s): Male.


Inclusion Criteria:

- Diagnosed Schizophrenia (WHO ICD 10)

- Treatment stable (no regulation in medicine for 6 weeks prior)

- Mono antipsychotic treatment

- No regular Antidepressants (PN accepted)

- No regular Benzodiazepines (PN accepted)

Exclusion Criteria:

- Dependence syndrome

- Severe physical illness

- MRI incompatible, non removable objects above shoulders

Locations and Contacts

Glostrup psychiatric center, Glostrup 2600, Denmark
Additional Information

Starting date: June 2011
Last updated: May 27, 2015

Page last updated: August 23, 2015

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