What are the potential medical complications of bulimia nervosa that I should monitor in my patients?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 16 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Potential medical complications of bulimia nervosa to monitor include:

  • Electrolyte imbalances such as hypokalaemia, which can lead to cardiac dysrhythmias and prolonged QT interval, especially in patients engaging in purging behaviors like vomiting, laxative or diuretic misuse ,.
  • Cardiac complications including bradycardia and arrhythmias; ECG monitoring is recommended for those with severe purging, significant weight changes, or on medications affecting cardiac function ,.
  • Dental erosion and oral health problems due to repeated vomiting; patients should be advised to avoid brushing teeth immediately after vomiting and to rinse with water or non-acidic mouthwash ,.
  • Gastrointestinal issues such as chronic laxative misuse leading to dependency and potential bowel dysfunction .
  • Dehydration and malnutrition, which may cause muscular weakness and hypotension ,.
  • Risk of paracetamol toxicity due to low body weight and altered metabolism .
  • Potential for severe electrolyte disturbances requiring acute medical care or inpatient admission if severe .

Regular monitoring in primary care should include weight/BMI, blood pressure, relevant blood tests including electrolytes, and ECG where indicated ,. Coordination with specialist services is essential for managing these complications effectively .

Educational content only. Always verify information and use clinical judgement.