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Is Pentoxifylline Able to Improve Olfactory Sensitivity?

This study has been completed.
Information provided by (Responsible Party):
Technische Universität Dresden Identifier:
First received: April 16, 2008
Last updated: February 4, 2016
Last verified: February 2016
Signal processing in the olfactory neuron could be influenced by inhibition of enzymes like phosphodiesterase. Pentoxifylline is a unspecific phosphodiesterase inhibitor. The hypothesis is that pentoxifylline could lead to increased sensitivity to odors.

Condition Intervention
Olfaction Disorders Drug: Pentoxifylline retard 400mg

Study Type: Observational
Study Design: Time Perspective: Prospective
Official Title: Agapurin Retard Used in Patients With Smell Disorder- A Post-marketing Observational Study

Resource links provided by NLM:

Further study details as provided by Technische Universität Dresden:

Primary Outcome Measures:
  • TDI-score [ Time Frame: at day 0 and follow up after 3 weeks ]

Secondary Outcome Measures:
  • odor threshold odor discrimination odor identification [ Time Frame: at day 0 and at follow up after 3 weeks ]

Enrollment: 7
Study Start Date: November 2009
Study Completion Date: January 2016
Primary Completion Date: January 2016 (Final data collection date for primary outcome measure)
Groups/Cohorts Assigned Interventions
Patients with posttraumatic, idiopathic, and postinflammatory cause of smell loss; patients age between 18 and 50 years. Odor threshold better than 1.
Drug: Pentoxifylline retard 400mg
Agapurin retard 400mg 3/day per os for 3 weeks
Other Name: Agapurin retard

Detailed Description:
Olfactory signal processing is conducted by a G-protein linked increase of intracellular concentration of adenosine 3´,5´-cyclic monophosphate (cAMP). In the cilia of olfactory sensory neurons (OSN) cAMP is degraded by phosphodiesterase 1C2 (PDE1C2). Inhibition of PDE1C2 could result in an increased response of OSN to chemical stimuli. Aim of the present prospective post-marketing surveillance study was to investigate the impact of pentoxifylline, an unspecific phosphodieasterase inhibitor, on olfactory function.

Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
hyposmic or functionally anosmic patients TDI-score <31; age: 18-50 years; odor threshold: better than 1; cause of smell loss: post traumatic, postinflammatory, idiopathic

Inclusion Criteria:

  • hyposmic or functionally anosmic patients TDI-score <31
  • age: 18-50 years
  • odor threshold: better than 1
  • cause of smell loss: post traumatic, postinflammatory, idiopathic

Exclusion Criteria:

  • normosmic patients,
  • patients with contraindications for application of pentoxifylline
  • patients that cannot give written agreement to the study
  • patients under 18 years and over 50 years of age
  Contacts and Locations
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Please refer to this study by its identifier: NCT00660868

Zentrum für Riechen und Schmecken, Universitäts- HNO- Klinik Dresden
Dresden, Germany, 01307
Sponsors and Collaborators
Technische Universität Dresden
Principal Investigator: Volker Gudziol, Dr. med. Technische Universität Dresden
  More Information

Responsible Party: Technische Universität Dresden Identifier: NCT00660868     History of Changes
Other Study ID Numbers: EK157072007
Study First Received: April 16, 2008
Last Updated: February 4, 2016

Keywords provided by Technische Universität Dresden:
olfactory sensitivity
smell loss

Additional relevant MeSH terms:
Olfaction Disorders
Sensation Disorders
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Platelet Aggregation Inhibitors
Radiation-Protective Agents
Protective Agents
Physiological Effects of Drugs
Vasodilator Agents
Free Radical Scavengers
Antioxidants processed this record on September 21, 2017