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Dr Paul Ng吳昊醫生
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PROCEDURE INFORMATION

Pyloric Botox in Hong Kong | Gastroparesis

Pyloric botulinum toxin injection has been studied in gastroparesis, but it should not be presented as routine or established treatment. Current AGA guidance suggests against routine use, including in medically refractory gastroparesis.

Dr Paul Ng is a Hong Kong gastroenterologist and hepatologist. Consultations in Central and Tsim Sha Tsui are by appointment; confirm the procedure location with the nurses.

PROCEDURE INFORMATION

Introduction

Gastroparesis means delayed emptying of the stomach without a mechanical blockage. The pylorus is the outlet muscle between the stomach and small bowel. During endoscopy, botulinum toxin may be injected into this muscle in an attempt to reduce resistance to emptying; whether this helps is uncertain.

Confirming gastroparesis

Nausea, vomiting, early fullness and bloating have many possible causes. A gastroparesis diagnosis requires compatible symptoms, exclusion of obstruction and an appropriately performed test showing delayed emptying; a four-hour gastric-emptying study is commonly used. Medicines and other conditions can affect results.

A specialist may review nutrition, hydration, glucose control where relevant, medicines that slow emptying and treatments with evidence for symptom or emptying improvement. Injection should not replace diagnostic assessment or established individualized care.

What the procedure involves

If considered in a specialist setting, the toxin is delivered by endoscope into the pyloric muscle. This is an off-label intervention for gastroparesis in many settings. It requires endoscopy and sedation planning, and the procedural team should explain the specific risks, alternatives and follow-up.

An endoscopic injection does not guarantee faster emptying or symptom relief. Any benefit may be limited or absent, and the effect of the toxin wears off. Selection based on pyloric testing is an area of investigation, not proof that the treatment works for a given person.

Evidence and treatment choices

Endoscopy-related risks include bleeding, infection and rare perforation; sedation also carries risks. Discuss medicines, allergies, relevant conditions and the reason this option is being raised before consenting.

The 2025 AGA guideline suggests against routine botulinum toxin injection for patients with gastroparesis refractory to medical management. Ask about the quality of evidence, the goal of treatment, alternatives and whether a clinical study is available. No procedure should be assumed to be beneficial because it is technically possible.

This page is informational, not a recommendation. The AGA suggests against routine pyloric botulinum toxin injection for gastroparesis; any exceptional or investigational use requires specialist discussion.

Professional guidance

A related condition does not mean this procedure is suitable; decisions require individual assessment.

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About this information

This is general educational information, not a diagnosis, a personalised recommendation or consent for a procedure. Whether to investigate or treat, the alternatives (including no procedure), benefits and risks require individual clinical assessment and discussion.