1. Clinical Overview
A fixed-dose combination oral solution primarily used as a urinary alkalinizer and electrolyte replenisher. Potassium citrate provides potassium and citrate ions, magnesium citrate supplies magnesium, and Vitamin B6 (Pyridoxine) aids in magnesium absorption and cellular metabolism. It is clinically significant for managing hypocitraturic calcium oxalate nephrolithiasis, renal tubular acidosis, and hypokalemia/hypomagnesemia, particularly in the Indian context where dietary deficiencies and recurrent kidney stones are prevalent.
| Onset | Duration | Bioavailability |
|---|---|---|
| Urinary alkalinization begins within 30-60 minutes; peak effect on urine pH occurs in 2-4 hours. | Urinary alkalinizing effect lasts for 6-8 hours per dose. | Potassium Citrate: ~100% (as potassium and citrate ions). Magnesium Citrate: ~25-30% (elemental magnesium). Vitamin B6: ~75-90%. |
2. Mechanism of Action
1. Potassium Citrate: Dissociates to provide potassium ions and citrate. Citrate is metabolized systemically to bicarbonate, raising blood and urine pH (alkalinization). In urine, increased citrate binds calcium, reducing calcium oxalate and phosphate supersaturation, inhibiting stone formation. Potassium helps correct hypokalemia. 2. Magnesium Citrate: Provides magnesium ions; acts as a physiologic calcium channel blocker, reducing calcium oxalate crystal growth and aggregation in urine. Also corrects hypomagnesemia. 3. Vitamin B6 (Pyridoxine): A cofactor in oxalate metabolism; deficiency can lead to hyperoxaluria. It enhances intestinal absorption of magnesium and is involved in neurotransmitter synthesis.
3. Indications & Uses
- Prevention and treatment of calcium oxalate and calcium phosphate kidney stones (especially hypocitraturic)
- Renal tubular acidosis (distal type) with hypocitraturia and/or hypokalemia
- Symptomatic hypokalemia and/or hypomagnesemia (when oral supplementation is indicated)
4. Dosage & Administration
Adult Dosage: 5ml (one teaspoonful) to 15ml (one tablespoonful), diluted in a glass of water (200-250ml), 2-3 times daily after meals. Typical starting dose is 10ml twice daily. Dose must be individualized based on urinary citrate and pH (target 6.0-7.0).
Administration: MUST be diluted in at least 200ml of water or juice. Take after meals to minimize GI upset. Drink additional glass of water after dose. Do not take while lying down. Maintain adequate fluid intake (2.5-3 L/day).
5. Side Effects
Common side effects may include:
- Nausea, mild diarrhea, abdominal discomfort
- Altered taste (alkaline taste)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Potassium-Sparing Diuretics (Spironolactone, Amiloride) | Increased risk of severe hyperkalemia | Major |
| ACE Inhibitors (Ramipril, Enalapril) / ARBs (Losartan) | Increased risk of hyperkalemia | Major |
| NSAIDs (Ibuprofen, Diclofenac) | May reduce renal function, increasing hyperkalemia risk | Moderate |
| Cardiac Glycosides (Digoxin) | Hypokalemia/hypomagnesemia potentiates digoxin toxicity; overcorrection can antagonize digoxin effect | Major |
| Tetracycline, Quinolone Antibiotics | Magnesium reduces absorption of these antibiotics. Separate administration by at least 2-3 hours. | Moderate |
| Levodopa | Vitamin B6 (>5mg) can decrease efficacy of levodopa (not carbidopa/levodopa combinations) | Moderate |
| Antacids containing aluminum | Increased aluminum absorption, risk of toxicity | Moderate |
7. Patient Counselling
- DO dilute the liquid in a full glass of water or juice before drinking.
- DO take after meals to reduce stomach upset.
- DO maintain a high fluid intake (2.5-3 liters of water daily).
- DO have regular blood tests as advised by your doctor.
- DO inform all your doctors you are taking this medicine.
- DO NOT take the medicine undiluted.
- DO NOT take while lying down or just before bedtime.
- DO NOT use salt substitutes (often contain potassium) without consulting your doctor.
- DO NOT start/stop any other medication without doctor's advice.
8. Toxicology & Storage
Overdose: Primarily symptoms of hyperkalemia (muscle weakness, flaccid paralysis, paresthesia, arrhythmias, cardiac arrest) and hypermagnesemia (hypotension, bradycardia, CNS depression, respiratory arrest, coma). Nausea, vomiting, diarrhea, metabolic alkalosis may also occur.
Storage: Store in a cool, dry place, protected from light. Keep the bottle tightly closed. Do not freeze. Keep out of reach of children. Shelf life is typically 24 months from date of manufacture. Do not use if the solution appears cloudy or contains particulate matter.