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Summary
Patients with galactosaemia require total lactose restriction, even from medications. This case highlights how lactose in drugs can cause severe hypokalaemia in galactosaemia patients, especially with burns.
Area of Science:
- Biochemistry
- Clinical Medicine
- Pharmacology
Background:
- Galactosaemia is a metabolic disorder requiring strict dietary lactose restriction.
- Management of adult patients with galactosaemia presents unique challenges, particularly concerning medication excipients.
- Burns are a significant physiological stressor, impacting electrolyte balance.
Observation:
- A patient with galactosaemia developed severe hypokalaemia despite potassium supplementation.
- The patient was receiving multiple oral medications containing small amounts of lactose.
- Proximal renal tubular dysfunction was identified as a contributing factor to potassium loss.
Findings:
- Prolonged exposure to lactose, even in small doses from oral drugs, induced proximal renal tubular dysfunction in a galactosaemia patient.
- This drug-induced dysfunction exacerbated potassium loss, leading to severe hypokalaemia.
- The combination of burns and lactose exposure significantly complicated electrolyte management.
Implications:
- This case underscores the critical need for lifelong and total lactose avoidance in galactosaemia patients.
- Healthcare providers must carefully review medication excipients for patients with metabolic disorders.
- Further research into lactose-containing drug safety in rare metabolic diseases is warranted.