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Dextromethorphan Hydrobromide

Dextromethorphan Hydrobromide, commonly known as a cough suppressant, is being investigated in various clinical trials for its potential therapeutic effects beyond respiratory relief. This article examines the use of Dextromethorphan Hydrobromide in clinical studies targeting conditions such as diabetic macular edema, rheumatoid arthritis, depression, post-operative pain, and cancer-related fatigue. We’ll explore the drug’s mechanisms, dosages, and potential benefits in these diverse medical applications.

Table of Contents

What is Dextromethorphan?

Dextromethorphan hydrobromide, often abbreviated as DXM, is a medication commonly used as a cough suppressant[1]. It belongs to a class of drugs called morphinans, which have effects on the brain and nervous system[2]. Dextromethorphan is available over-the-counter in many cough and cold medicines.

Some other names for dextromethorphan include:

  • DXM
  • Delsym
  • Creomulsion
  • Benylin

Uses of Dextromethorphan

The main use of dextromethorphan is to suppress coughing. However, researchers are studying its potential benefits for several other conditions:

  • Cough suppression: Dextromethorphan is primarily used to relieve coughing due to the common cold or other respiratory infections[1].
  • Pain relief: Studies are looking at dextromethorphan’s ability to reduce pain after surgery and in chronic pain conditions[3][4].
  • Depression: Researchers are investigating if dextromethorphan could help treat major depressive disorder[5].
  • Diabetic macular edema: This is a complication of diabetes that affects the eyes. A study is examining if dextromethorphan could help reduce swelling in the retina[6].
  • Rheumatoid arthritis: A trial is looking at whether dextromethorphan could help reduce inflammation and pain in rheumatoid arthritis[7].
  • Cancer-related fatigue: Researchers are studying if dextromethorphan could help relieve fatigue in cancer patients[8].

How Dextromethorphan Works

Dextromethorphan works by affecting certain receptors in the brain and nervous system. It has several effects:

  • Cough suppression: It acts on the cough center in the brain to reduce the urge to cough[1].
  • Pain relief: Dextromethorphan can block certain receptors (called NMDA receptors) that are involved in pain signaling[5].
  • Anti-inflammatory effects: Some studies suggest it may help reduce inflammation in the body[6].

Formulations and Dosing

Dextromethorphan comes in several forms:

  • Syrup[9]
  • Tablets
  • Capsules
  • Soft pastilles (a type of lozenge)[9]

The dosage depends on the condition being treated and the specific product being used. For example, in one study on cough in children, the dose was 15 mg per 10 mL of syrup[1]. Always follow the instructions on the label or your doctor’s advice.

Potential Side Effects

While dextromethorphan is generally considered safe when used as directed, it can cause side effects. These may include:

  • Nausea
  • Dizziness
  • Drowsiness

In clinical trials, researchers carefully monitor for any adverse effects. For example, in a study on post-operative pain, they looked for signs of nausea, vomiting, respiratory depression (slowed breathing), and bleeding[2].

Ongoing Research

Scientists are conducting many studies to better understand how dextromethorphan might help with various conditions. Some areas of current research include:

  • Pediatric cough: A study is looking at how well dextromethorphan works for acute cough in children aged 6-11[1].
  • Post-operative pain: Researchers are investigating if dextromethorphan can help reduce pain after knee replacement surgery[3].
  • Depression: A trial is examining if dextromethorphan could be a rapid-acting treatment for major depressive disorder[5].
  • Diabetic eye disease: Scientists are studying if dextromethorphan could help reduce swelling in the retina caused by diabetes[6].
  • Rheumatoid arthritis: A study is looking at whether dextromethorphan could help reduce disease activity in rheumatoid arthritis[7].

These studies are helping researchers understand the potential benefits and risks of using dextromethorphan for conditions beyond cough suppression. It’s important to note that while these studies are promising, more research is needed before dextromethorphan can be recommended for these uses.

Condition Dosage Duration Primary Outcome Measures
Diabetic Macular Edema 60 mg twice daily 24 months Change in retinal thickness, visual acuity
Rheumatoid Arthritis 120 mg once daily 6 months EULAR therapeutic response rate
Major Depressive Disorder Two 75 mg doses, 4 hours apart Single day Change in Montgomery-Åsberg Depression Rating Scale
Post-operative Pain 60 mg preop, 30 mg at 8 and 16 hours postop 24 hours Post-operative opioid use, pain scores
Cancer-related Fatigue Not specified 3 weeks Effect on cancer-related fatigue

FAQ

  • What is Dextromethorphan Hydrobromide primarily known for? Dextromethorphan Hydrobromide is primarily known as a cough suppressant. It's commonly found in over-the-counter cough medicines.
  • What other conditions are being studied using Dextromethorphan Hydrobromide? Clinical trials are exploring its use in conditions such as diabetic macular edema, rheumatoid arthritis, major depressive disorder, post-operative pain, and cancer-related fatigue.
  • How is Dextromethorphan Hydrobromide being tested for diabetic macular edema? In a study for diabetic macular edema, participants take 60 mg of Dextromethorphan orally twice daily for 24 months. The study measures changes in retinal thickness and visual acuity.
  • What is the dosage of Dextromethorphan Hydrobromide used in the rheumatoid arthritis study? In the rheumatoid arthritis study, participants receive 120 mg of Dextromethorphan Hydrobromide once daily for 6 months as an add-on therapy to traditional disease-modifying anti-rheumatic drugs.
  • How is Dextromethorphan Hydrobromide being tested for post-operative pain? In a study for post-operative pain after total knee arthroplasty, patients receive 60 mg of Dextromethorphan preoperatively, followed by 30 mg at 8 and 16 hours postoperatively. The study measures post-operative opioid use and pain scores.

Ongoing Clinical Trials on Dextromethorphan Hydrobromide

  • Study of AZD3470 alone and in combination with other cancer drugs for patients with advanced solid tumors that are MTAP deficient

    Recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    France The Netherlands Spain

  • Study of SAR443579 Infusion for Adults and Children with Relapsed or Refractory Acute Myeloid Leukemia, B-Cell Acute Lymphoblastic Leukemia, HR-MDS, or BPDCN

    Not recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    France The Netherlands

Glossary

  • Diabetic Macular Edema: A complication of diabetes that causes swelling in the macula, the part of the retina responsible for sharp, straight-ahead vision. It can lead to vision loss if left untreated.
  • Rheumatoid Arthritis: A chronic inflammatory disorder that can affect more than just your joints. In some people, the condition can damage a wide variety of body systems, including the skin, eyes, lungs, heart and blood vessels.
  • Major Depressive Disorder: A mental health condition characterized by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life.
  • Post-operative Pain: Pain that occurs after a surgical procedure, which can vary in intensity and duration depending on the type of surgery and individual factors.
  • Cancer-related Fatigue: A distressing, persistent, subjective sense of physical, emotional, and/or cognitive tiredness or exhaustion related to cancer or cancer treatment that is not proportional to recent activity and interferes with usual functioning.
  • Optical Coherence Tomography (OCT): A non-invasive imaging technique that uses long-wavelength light to capture micrometer-resolution, cross-sectional images from biological tissue, often used to measure retinal thickness.
  • ETDRS Grid: Early Treatment Diabetic Retinopathy Study grid, a standardized method for measuring and reporting retinal thickness in specific areas of the retina.
  • Visual Acuity: A measure of the ability of the eye to distinguish shapes and details of objects at a given distance. It is typically measured using an eye chart.
  • Fluorescein Angiography: A technique for examining the circulation of the retina using a fluorescent dye and a special camera.
  • Microperimetry: A technique that allows for precise testing of retinal sensitivity and fixation stability, often used to assess macular function.

References

  1. https://clinicaltrials.gov/study/NCT02651116
  2. https://clinicaltrials.gov/study/NCT02727491
  3. https://clinicaltrials.gov/study/NCT05278494
  4. https://clinicaltrials.gov/study/NCT00003687
  5. https://clinicaltrials.gov/study/NCT02860962
  6. https://clinicaltrials.gov/study/NCT01441102
  7. https://clinicaltrials.gov/study/NCT02368093
  8. https://clinicaltrials.gov/study/NCT00176540
  9. https://clinicaltrials.gov/study/NCT02191709