How can a 5‑gram dose of Lokelma (sodium zirconium cyclosilicate) be obtained from a 10‑gram sachet for an 84‑year‑old man with stage 3 chronic kidney disease and severe hyperkalaemia?

Lokelma Cannot Be Divided—Use the 5g Sachet Instead

You cannot split or divide a 10g Lokelma sachet to obtain a 5g dose. Instead, use the commercially available 5g sachet, which is specifically manufactured for this dose. 1

Why Division Is Not Appropriate

Lokelma (sodium zirconium cyclosilicate) is supplied as a powder for oral suspension in pre-measured sachets of either 5g or 10g 1. The medication is:

• A fine powder with a mean particle size of 20 µm
• Designed to be mixed with water and consumed as a complete suspension
• Not formulated for splitting or partial dosing

Attempting to divide the powder would result in:

• Inaccurate dosing due to inability to precisely measure half the powder
• Potential waste of medication
• Risk of underdosing or overdosing
• Contamination concerns with opened sachets

Correct Approach for This Patient

For an 84-year-old man with stage 3 CKD and severe hyperkalemia:

Initial Treatment (First 48 Hours):

• Use the 10g sachet three times daily for rapid correction 1
• This is the FDA-approved initial dose for severe hyperkalemia
• Monitor serum potassium closely

Maintenance Treatment:

• Once normokalemia is achieved, transition to 5g once daily using the 5g sachet 1
• The maintenance dose range is 5g every other day to 15g daily, adjusted based on potassium levels
• For this elderly patient with stage 3 CKD, starting at 5g daily is appropriate

Clinical Considerations for This Patient

Important monitoring points:

• Each 5g dose contains approximately 400mg of sodium—monitor for edema, especially given his age and CKD 1
• Stage 3 CKD patients respond well to SZC with 82-100% achieving normokalemia within 24-72 hours 2
• Adjust diuretics if edema develops 1
• Monitor for hypokalemia (4.1% risk in non-dialysis patients) 1

Medication timing:

• Administer other oral medications at least 2 hours before or after Lokelma due to potential pH-dependent drug interactions 1

Preparation Instructions

For the 5g dose:

1. Empty the entire 5g sachet into a glass with approximately 3 tablespoons of water
2. Stir well and drink immediately
3. Add more water to the glass, stir, and drink to ensure complete dose administration 1

The evidence strongly supports using pre-measured sachets rather than attempting to divide doses, as this ensures accurate dosing and optimal therapeutic outcomes 3.