oesophagus relaxation medication
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oesophagus relaxation medications smooth muscle
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achalasia diffuse oesophageal spasm treatment pharmacology
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Oesophageal Relaxation Medications
These are used to reduce oesophageal smooth muscle tone, relieve spasm, or facilitate lower oesophageal sphincter (LOS) relaxation in conditions such as achalasia, diffuse oesophageal spasm (DOS), nutcracker oesophagus, and other hypercontractile motility disorders.
Drug Classes & Agents
| Drug Class | Examples | Mechanism | Notes |
|---|---|---|---|
| Nitrates | Glyceryl trinitrate (GTN), Isosorbide dinitrate | Release NO → smooth muscle relaxation | Short-acting GTN sublingually before meals; limited long-term use due to tolerance and headache |
| Calcium channel blockers (CCBs) | Nifedipine, Diltiazem | Block L-type Ca²⁺ channels → reduce smooth muscle contraction | Sublingual nifedipine (10–20 mg) before meals is commonly used; modest efficacy |
| Phosphodiesterase-5 inhibitors | Sildenafil | Inhibit cGMP breakdown → sustained smooth muscle relaxation | Used in oesophageal spasm; evidence limited |
| Botulinum toxin (Botox) | OnabotulinumtoxinA | Blocks ACh release at myenteric plexus → reduces LOS pressure | Injected endoscopically into LOS or oesophageal body; temporary effect (~6–12 months), repeated injections needed |
| Pain modulators / neuromodulators | Tricyclic antidepressants (e.g. amitriptyline), SSRIs, trazodone | Modulate visceral hypersensitivity | Useful when chest pain is the dominant symptom |
| Peppermint oil | – | Natural smooth muscle antispasmodic | Empirical use for oesophageal spasm; minimal evidence |
Condition-Specific Approach
Achalasia
- Pharmacotherapy (nitrates, CCBs) is a temporising measure only — effects are modest and transient
- Definitive treatment: pneumatic dilation, Heller myotomy, or POEM (per-oral endoscopic myotomy)
- Botulinum toxin: preferred in elderly/surgical high-risk patients (Bailey & Love's, p. 1142–1146)
Diffuse Oesophageal Spasm / Hypercontractile Disorders
- Identify and avoid triggers (diet, GORD)
- Calcium channel blockers, nitrates, PDE-5 inhibitors, and pain modulators used — all with limited efficacy
- Botulinum toxin injection into the oesophageal body may help
- Refractory cases: long-segment surgical myotomy or extended POEM (Bailey & Love's, p. 1146)
Key Practical Points
- Sublingual administration (GTN, nifedipine) gives faster onset and is preferred for pre-meal dosing
- Nitrates and CCBs lower LOS pressure and reduce amplitude of contractions but do not restore normal peristalsis
- Botulinum toxin is the most effective pharmacological option but requires repeat endoscopic procedures
- None of these medications are curative — they manage symptoms while awaiting or in lieu of definitive intervention
Note: Always evaluate for secondary causes (GORD, eosinophilic oesophagitis, pseudoachalasia from malignancy) before committing to long-term therapy.
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