Dextrose 5 % (D5W) with Potassium Chloride 0.224 % (often labeled “D5W + 0.224 % KCl”) in a plastic infusion container is a commonly used intravenous (IV) fluid in hospital and critical‑care settings. Below is a concise overview of what it is, when it’s used, how it’s given, and what to watch out for.
1. What It Is
| Component |
Typical Concentration |
Function |
| Dextrose 5 % |
5 g per 100 mL (50 g/L) |
Provides a 5 % glucose solution (≈0.28 osm/kg), giving a small caloric load and maintaining blood glucose levels. |
| Potassium Chloride 0.224 % |
0.224 g per 100 mL (2.24 g/L, ≈0.05 mmol/mL) |
Supplies potassium (≈0.5 mmol/kg/hr in a typical 500 mL bag) to prevent or treat mild hypokalemia. |
| Vehicle |
Lactated Ringer’s‑like or sterile water |
Dilutes the solution in a plastic bag (usually 500 mL or 1 L). |
The solution is isotonic (≈280 mOsm/kg), making it suitable for most patients who need fluid, glucose, and potassium without significant osmotic shift.
2. Common Indications
| Situation |
Why Use D5W + KCl? |
| Maintenance fluid in hospitalized adults and children when potassium replacement is needed. |
| Hypoglycemia or during glucose monitoring where a small caloric source is required. |
| Electrolyte‑free or low‑salt environments (e.g., renal replacement therapy, dialysis). |
| Post‑operative or burn patients who need gentle fluid and electrolyte support. |
It is not indicated for treating severe hypokalemia, hypoglycemia, or in patients with renal failure who must avoid potassium.
3. Typical Dosing & Administration
- Bag Size – 500 mL (most common) or 1 L.
- Potassium Load – Each 500 mL bag delivers ≈0.5 mmol/kg/hr (≈12–15 mmol in a 500 mL bag). This is a maintenance dose, not a replacement dose.
- Rate –
- Adults: 100–200 mL/hr (≈1–2 L/24 h).
- Pediatrics: adjusted to weight (often 50–100 mL/kg/day, split into 3–4 h intervals).
- Check Blood K⁺ – before and 2–4 h after starting infusion, especially in patients with recent potassium shifts or on medications that affect K⁺ (e.g., ACE inhibitors, ARBs, diuretics).
- Avoid mixing with high‑potassium drugs (e.g., potassium chloride tablets, potassium‑containing laxatives) unless carefully monitored.
4. Precautions & Contraindications
| Issue |
Why It Matters |
| Hyperkalemia |
Over‑replacement can lead to dangerous cardiac arrhythmias. |
| Renal impairment |
Kidneys excrete excess K⁺; impaired function → accumulation. |
| Cardiac disease |
High serum K⁺ can precipitate arrhythmias. |
| Use with high‑potassium meds |
Additive effect. |
| IV access |
Requires a central line or large‑caliber peripheral line for >200 mL/h; avoid extravasation. |
| Plastic bag compatibility |
Most bags are compatible, but check for degradation at the infusion site. |
5. Common Side Effects / Adverse Events
| Symptom |
Likely Cause |
| Hyperglycemia |
Excess glucose from D5W. |
| Hyperkalemia |
Over‑replacement or impaired excretion. |
| Fluid overload |
Excess volume in heart‑failure or renal failure. |
| Allergic reaction |
Rare; hypersensitivity to plastic additives or preservatives. |
| Skin irritation / phlebitis |
At the infusion site if flow rate is too high. |
6. Drug Interactions
| Drug |
Interaction |
| ACE inhibitors / ARBs |
↑ serum K⁺; monitor. |
| Potassium‑sparing diuretics (spironolactone, triamterene) |
↑ K⁺. |
| Digoxin |
Hyperkalemia can reduce digoxin’s effect and cause arrhythmias. |
| NSAIDs |
May decrease renal K⁺ excretion; monitor. |
| KCl tablets / supplements |
Additive effect → hyperkalemia. |
7. Storage & Handling
| Item |
Recommendation |
| Bag |
Store at 2–8 °C (refrigerated) until use; keep sealed to avoid contamination. |
| Infusion Rate |
Use a calibrated infusion pump; verify the pump’s calibration before use. |
| Expiration |
Typically 6–12 months from manufacture; check the label. |
| Discard |
Any bag with visible contamination, cloudiness, or after the expiration date. |
8. Quick Reference Table
| Parameter |
Value |
| Potassium |
0.224 % = 2.24 g/L ≈ 50 mmol/L |
| Dextrose |
5 % = 50 g/L |
| Isotonicity |
≈ 280 mOsm/kg |
| Volume (common bag) |
500 mL (or 1 L) |
| Potassium dose |
≈12–15 mmol per 500 mL bag |
| Typical infusion rate |
100–200 mL/hr in adults |
9. When to Switch or Stop
- Drop in serum potassium < 3.5 mmol/L → consider higher‑dose potassium or separate KCl infusion.
- Serum potassium > 5.5 mmol/L → slow or stop the infusion; treat hyperkalemia.
- Signs of fluid overload (dyspnea, edema, JVD) → reduce rate or stop.
- Hyperglycemia > 250 mg/dL (in non‑diabetics) → consider lowering glucose source or adding insulin.
10. Bottom Line
Dextrose 5 % + Potassium Cl 0.224 % is a maintenance IV fluid that gently supplies glucose and potassium to patients who need fluid therapy but are not in acute crisis. It’s safe when used as directed, but always monitor electrolytes, especially potassium, and watch for signs of fluid overload or hyperglycemia. If you’re a clinician, follow your institution’s protocols for infusion rates and monitoring; if you’re a patient or caregiver, discuss any concerns with your healthcare provider.
Disclaimer: This information is educational and not a substitute for individualized medical advice. Consult your healthcare provider for personal recommendations.