NutriStack
Lactulose and Potassium, a synergy.
Lactulose can cause diarrhea when the dose is too high, and excessive laxative effect can lower potassium. A published elderly-patient case involving high-dose lactulose and sorbitol reported severe hyponatremia with hypokalemia, hypocalcemia, and rhabdomyolysis. Potassium can be clinically useful when hypokalemia is confirmed, but self-treatment can overshoot in kidney disease or with potassium-raising drugs.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
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At a glance
- Pair type
- Synergy
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Emerging evidence
Synergy
What is happening. Lactulose can cause diarrhea when the dose is too high, and excessive laxative effect can lower potassium. A published elderly-patient case involving high-dose lactulose and sorbitol reported severe hyponatremia with hypokalemia, hypocalcemia, and rhabdomyolysis. Potassium can be clinically useful when hypokalemia is confirmed, but self-treatment can overshoot in kidney disease or with potassium-raising drugs.
Mechanism. Lactulose is a nonabsorbed osmotic disaccharide that draws water into the colon and is fermented to organic acids. Excess diarrhea causes fecal potassium and fluid loss, and volume depletion can increase renal potassium excretion; potassium supplementation replaces the deficit when documented.
Recommendation. If lactulose is prescribed for hepatic encephalopathy, titrate only to the stool target your clinician gave you rather than causing continuous diarrhea. Ask about electrolyte checks if stools become very frequent, watery, or prolonged, or if you develop weakness, cramps, palpitations, dizziness, or confusion. Take potassium supplements only when your potassium level or prescriber supports it.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Lactulose and Potassium are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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