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NCT00055549 · ClinicalTrials.gov registry record · Phase 1
Dextromethorphan to Treat Patients With Voice Spasms
A Phase 1 study, sponsored by National Institute of Neurological Disorders and Stroke (NINDS).
- Completed
- Registry status
- Phase 1
- Development phase
- 65
- Enrollment target
NCT00055549: Completed Phase 1 study, sponsored by National Institute of Neurological Disorders and Stroke (NINDS).
NCT00055549 is a Phase 1 study that has completed, run by National Institute of Neurological Disorders and Stroke (NINDS). The registered enrollment target is 65 participants, roughly in line with the 60-participant average among 29,502 other Phase 1 trials with a reported enrollment target. According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT00055549, a Phase 1 study, has completed, sponsored by National Institute of Neurological Disorders and Stroke (NINDS).
- COMPLETED
- Registry status
- Phase 1
- Development phase
- 65 participants
- Enrollment target
Study Summary
This study will examine how dextromethorphan, a drug that alters reflexes of the larynx (voice box), might change voice symptoms in people with voice disorders due to uncontrolled laryngeal muscle spasms. These include abductor spasmodic dysphonia (breathy voice breaks), adductor spasmodic dysphonia (vowel breaks), muscular tension dysphonia (tight strained voice), and vocal tremor (tremulous voice). Dextromethorphan-one of a group of drugs called NMDA antagonists-has been used for years in over-the-counter cough suppressant medicines. In animal studies, the drug has blocked one of the reflexes in the larynx that may be associated with spasms in the laryngeal muscles. This study will compare the effects of dextromethorphan, lorazepam (a valium-type drug), and a placebo (inactive substance) in patients with the four types of voice disorders described above. Patients with spasmodic dysphonia, muscular tension dysphonia and vocal tremor may be eligible for this study. Individuals who smoke or use tobacco, who have vocal nodules or polyps, or who have a history of airway obstruction may not participate. Candidates will be screened with a medical history and physical examination, a questionnaire, voice recording (repeating sentences into a microphone), and nasolaryngoscopy (examination of the larynx with a tube advanced through the nose). For the nasolaryngoscopy, the inside of the nose is sprayed with a decongestant (to open the nasal passages) and possibly a local anesthetic. A small, flexible tube called a nasolaryngoscope is passed through the nose to look at the larynx during speech and other tasks, such as singing, whistling and prolonged vowels. Participants will be admitted to the NIH Clinical Center for each of three visits, which will last from the afternoon of one day to late afternoon of the following day. At each visit, patients will complete a questionnaire, baseline speech recording, and a test for sedation level. They will take three pills-either dextro
Interventions
- DRUG Lorazepam
- DRUG Dextromethorphan
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 65 participants |
| Start Date | 2003-03-04 |
| Est. Completion | 2009-11-13 |
| Phase | Phase 1 |
What the finished NCT00055549 record still lists
NCT00055549 is an interventional study that assigns participants to a tested intervention. The registry caps enrollment at 65 participants, a relatively small participant target, roughly in line with the 60-participant average among 29,502 other Phase 1 trials with a reported enrollment target.
The record links to 0 conditions, and to 2 interventions - of which Lorazepam is the first listed.
NCT00055549 does not publish any study locations in the registry export this page uses.
Frequently Asked Questions
What is clinical trial NCT00055549 about?
NCT00055549 is a clinical study titled "Dextromethorphan to Treat Patients With Voice Spasms". This study will examine how dextromethorphan, a drug that alters reflexes of the larynx (voice box), might change voice symptoms in people with voice disorders due to uncontrolled laryngeal muscle spasms. These include abductor spasmodic dysphonia (breathy voice breaks), adductor spasmodic dysphonia...
What is the current status of trial NCT00055549?
This trial is currently completed. It is a Phase 1 study. The enrollment target is 65 participants. The study started on 2003-03-04. Estimated completion is 2009-11-13.
What interventions are being tested in trial NCT00055549?
The interventions under investigation include: Lorazepam (DRUG), Dextromethorphan (DRUG).
Who is sponsoring clinical trial NCT00055549?
This trial is sponsored by National Institute of Neurological Disorders and Stroke (NINDS), which has 567 total clinical trials registered on ClinicalTrials.gov.
Learn More About Clinical Trials
How this trial's enrollment target compares
Where NCT00055549's enrollment target sits among peer trials
65 798th of 2000 higher than 1,193 of 2,000 other Phase 1 trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other Phase 1 trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
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