Inpatient Clinical Trial Examining the Effects of Pentazocine on Manic Symptoms
Overview
- Phase
- Phase 2
- Intervention
- Talwin Nx
- Conditions
- Bipolar Disorder
- Sponsor
- Mclean Hospital
- Enrollment
- 10
- Primary Endpoint
- Mania Symptoms Using MACS
- Status
- Completed
- Last Updated
- 11 years ago
Overview
Brief Summary
The opiate neurotransmitter system is thought to be involved in many abnormal mood states. Some researchers have suggested that changes in this system may trigger the switch to/from manic and depressive states in bipolar disorder. One problem with most of the currently available opiate medications is that they can produce addiction/dependence. A particular kind of opiate medication known as kappa-opiates may be able to produce changes in this system with much less risk of addiction. This study looks at Talwin (a combination of pentazocine and naloxone), a medication which affects the kappa and mu opiate systems. The study will examine whether two doses of Talwin affect manic symptoms in people who have been admitted to the hospital. This study will give more information about the involvement of the opiate system in bipolar disorder, and give important information for use in developing new treatments.
Detailed Description
Opiates have a long history of treating mood disorders. Some researchers have suggested that changes in this system may trigger the switch to/from manic and depressive states in bipolar disorder. The clinical use of opiate medications has been limited by their abuse/dependence potential. Studies of opiate receptor subtypes have raised the possibility that medications targeting the kappa/dynorphin system could be used to target mood symptoms with reduced/limited addiction potential. Rodent studies at Mclean indicate that kappa-agonists have pro-depressant effects and kappa-antagonists have anti-depressant effects. In addition, antimanic/antipsychotic medications regulate the activity of dynorphin cells. This study is a pilot open-label investigation using Talwin, a combination of pentazocine and naloxone. Pentazocine is a kappa agonist and mixed mu agonist. Two doses of Talwin will be given to acutely manic inpatients in a cumulative-dosing strategy. Measurements of manic symptoms will be conducted before, during, and after administration. This study will determine whether pentazocine has an immediate or sustained impact on acute mania symptoms.
Investigators
Beth L. Murphy MD, PhD
Principal Investigator
Mclean Hospital
Eligibility Criteria
Inclusion Criteria
- •Young Mania Rating Scale (YMRS) greater than 14
- •Inpatient
Exclusion Criteria
- •History of opiate abuse/dependence
- •Recent history of substance abuse
- •Pregnancy
- •Unstable medical issues
- •Use of opiate medications for pain management
Arms & Interventions
Pentazocine/Talwin
Talwin NX
Intervention: Talwin Nx
Outcomes
Primary Outcomes
Mania Symptoms Using MACS
Time Frame: hourly for 6 hours after first dose of pentazocine; hour 0 is the baseline score and also when first dose of pentazocine was administered
Assessment of current mania symptoms using Mania Acute Change Scale (MACS). All 20 questions on the scale have a 0 (absent)-4(most severe) range for describing mania symptoms. The mean MACS score totals were reported, with the total ranging from 0-80. A higher total score indicates a greater number of symptoms and higher symptom intensity, while a smaller score indicates a lesser number of symptoms and higher lower intensity.
Secondary Outcomes
- YMRS Scores(Each morning of the three-day study)