Disodium Hydrogen Citrate Syrup: Uses, Side Effects, Precautions and Dosage

Medically Reviewed By Dr. Vijay Kumar Singh, DM (Nephrology)|MD (Internal Medicine)|MBBS, Consultant - Renal Care

Disodium Hydrogen Citrate Syrup

Disodium hydrogen citrate is an alkalinising agent used to raise urinary pH in conditions where an acidic urine environment causes or perpetuates disease. It is metabolised to bicarbonate and buffers excess hydrogen ions in blood and urine. Clinically prescribed for burning micturition in urinary tract infections, prevention of uric acid and calcium oxalate kidney stones. and mild metabolic acidosis. Its syrup formulation makes it suitable for adults and children.

What is Disodium Hydrogen Citrate Used For

Doctors prescribe disodium hydrogen citrate for:

• Urinary Tract Infections (UTIs): Alkalinises urine to reduce the burning sensation, frequency and discomfort associated with bacterial cystitis and lower UTIs, providing symptomatic relief 

• Kidney Stone Prevention: Raises urinary pH to inhibit the crystallisation of uric acid and is sed both acutely and as long-term prophylaxis in recurrent stone formers

• Metabolic Acidosis: Corrects mild to moderate metabolic acidosis in conditions such as renal tubular acidosis (where the kidney fails to excrete acid adequately) and in chronic kidney disease (where bicarbonate-generating capacity is impaired).

• Gout: Uric acid solubility increases substantially as urinary pH rises above 6.0; alkalinisation with disodium hydrogen citrate facilitates urate excretion and reduces the risk of uric acid crystal deposition in patients with hyperuricaemia or gout.

How Does Disodium Hydrogen Citrate Work

After oral absorption, disodium hydrogen citrate is metabolised to sodium bicarbonate and carbon dioxide. Bicarbonate enters the bloodstream and neutralises excess hydrogen ions, raising blood pH toward normal. In the kidneys, bicarbonate filtered into the urine raises urinary pH typically from the acidic range of 5.0 to 6.0 up to 6.5 to 7.5 with therapeutic dosing. This pH shift reduces the irritant effect of acidic urine on inflamed urothelium and alters the solubility of stone-forming solutes, making uric acid more soluble and reducing conditions favouring calcium oxalate precipitation. The sodium content contributes to mild fluid retention and must be considered in patients with cardiac or renal limitations.

Disodium Hydrogen Citrate for Kidney Stones

Uric acid nephrolithiasis occurs predominantly in patients with persistently low urinary pH (below 5.5), which renders uric acid insoluble and drives crystal aggregation. Raising urinary pH to 6.0 to 6.5 dissolves newly formed crystals and prevents further precipitation. In calcium oxalate stone disease, alkalinisation increases tubular citrate reabsorption; raised urinary citrate binds calcium, reducing free calcium available for oxalate complexation and inhibiting crystal nucleation. Patients with hyperuricosuria, hypocitraturia or renal tubular acidosis are candidates for long-term alkalinising therapy, with urinary pH monitoring guiding dose titration.

Disodium Hydrogen Citrate for Urinary Problems

In lower urinary tract infections, inflamed bladder mucosa is sensitive to acidic urine, amplifying dysuria, urgency and suprapubic discomfort beyond what the infection alone produces. Alkalinising the urine within hours of the first dose reduces this chemical irritation while antibiotic therapy addresses the causative organism. Disodium hydrogen citrate has no antimicrobial activity; it functions purely as a symptom modifier. In patients with recurrent urethral or bladder irritation without confirmed infection, periodic alkalinisation may reduce symptom burden, though persistent symptoms should prompt investigation.

Disodium Hydrogen Citrate Dosage and How to Take It

• Standard adult dose: 10 mL three times daily, diluted in a full glass of water, taken after meals

• For UTI symptom relief take every 8 hours for 48 hours initially, then reassess based on symptom response and microbiological results.

• Paediatric dosing is weight-based and determined by your doctor (typically 5 mL two to three times daily for younger children).

• Always dilute in at least 100 to 150 mL of water; undiluted syrup causes gastric irritation.

• Take after food to reduce nausea and gastric discomfort.

• Do not exceed the prescribed dose; over-alkalinisation causes metabolic alkalosis including muscle cramps, tetany and confusion.

• Monitor urinary pH periodically during prolonged use (targeting pH 6.0 to 7.0) for stone prophylaxis.

Disodium Hydrogen Citrate Side Effects

Common adverse effects are:

• Nausea and gastric discomfort typically when taken on an empty stomach or without adequate dilution

• Loose stools or mild diarrhoea 

• Bloating 

• Belching.

Less common side effects are:

• Oedema and fluid retention like ankle swelling, particularly in those with heart failure or chronic kidney disease

• Elevated blood pressure in sodium-sensitive individuals during prolonged therapy.

Serious but rare adverse effects are:

• Metabolic alkalosis with excessive or prolonged dosing, causing muscle cramps, tetany, paraesthesiae and in severe cases cardiac arrhythmia.

• Hyperkalaemia.

Who Should Avoid Disodium Hydrogen Citrate?

Certain groups of people should avoid disodium hydrogen citrate. They are:

• Severe renal impairment (eGFR below 30 mL/min/1.73 m²) 

• Established metabolic alkalosis 

• Strict sodium-restricted patients like decompensated heart failure, uncontrolled hypertension, or significant oedema

• Hyperaldosteronism or conditions predisposing to sodium retention 

• Known hypersensitivity to citrate compounds or any component of the syrup formulation.

Precautions When Taking Disodium Hydrogen Citrate

• Monitor serum sodium, potassium and bicarbonate before initiating long-term therapy and periodically during treatment.

• Assess eGFR and serum creatinine at baseline; adjust dose frequency and sodium load in mild to moderate renal impairment.

• Dilute adequately and maintain fluid intake of at least 2 litres daily to support urinary stone prevention.

• Use with caution alongside potassium-sparing diuretics, ACE inhibitors or ARBs as combined sodium loading may alter potassium balance

• Monitor blood pressure during extended courses in hypertensive patients; seek review if systolic pressure rises above pre-treatment values

• Not a substitute for antibiotic therapy in confirmed UTI; microbiological assessment and antimicrobial treatment must be initiated concurrently

• Pregnancy and lactation: use only under medical supervision as sodium loading may contribute to fluid retention and blood pressure elevation.

Conclusion

Disodium hydrogen citrate syrup offers predictable urinary alkalinisation with established roles in UTI symptom relief, uric acid stone prevention & dissolution and mild metabolic acidosis correction. Its liquid formulation allows flexible dosing across age groups. Adequate dilution, post-meal administration, sodium awareness and periodic renal function monitoring are the practical cornerstones of safe use, particularly during long-term prophylactic courses.

FAQs

1. What is Disodium Hydrogen Citrate syrup used for?

   Disodium hydrogen citrate syrup is used to alkalinise urine, providing symptomatic relief in urinary tract infections, preventing uric acid and calcium oxalate kidney stones and correcting mild metabolic acidosis in conditions such as renal tubular acidosis and early chronic kidney disease.

2. Does Disodium Hydrogen Citrate help with UTI symptoms?

   Alkalinising the urine reduces the irritant effect of acidic urine on inflamed bladder mucosa, relieving burning, urgency and discomfort within hours of the first dose. It does not treat the causative organism and must be used along with appropriate antibiotic therapy for confirmed bacterial infections.

3. How should Disodium Hydrogen Citrate syrup be taken?

   Take 10 mL diluted in a full glass of water, three times daily, after meals. Adequate dilution reduces gastric irritation and supports urinary stone prevention. Do not take undiluted. Maintain overall fluid intake of at least 2 litres daily throughout the course of treatment.

4. What are the side effects of Disodium Hydrogen Citrate syrup?

   Common side effects are nausea, bloating, loose stools and belching. Less common effects are ankle oedema and mildly elevated blood pressure from sodium loading. Rare but serious adverse effects are metabolic alkalosis, presenting as muscle cramps, tetany or paraesthesiae requiring prompt dose reduction.

5. Can Disodium Hydrogen Citrate be taken with food?

   Taking the syrup after meals is specifically recommended to reduce nausea and gastric discomfort. Food slows gastric emptying, reducing direct mucosal contact with the alkalinising agent and improving tolerability without significantly affecting the speed or extent of urinary pH elevation.

6. Is Disodium Hydrogen Citrate safe for long-term use?

   Long-term use for kidney stone prophylaxis or renal tubular acidosis management is clinically established when renal function is monitored regularly. Serum electrolytes, blood pressure and urinary pH should be checked periodically. Use in severe renal impairment requires caution due to sodium load and alkalosis risk.

7. How long does disodium hydrogen citrate take to work?

   Urinary pH typically start rising within 1 to 2 hours of the first dose. Symptomatic UTI relief like reduced burning & urgency is usually noticeable within 24 to 48 hours. For kidney stone dissolution or long-term prophylaxis sustained pH elevation over weeks to months produces progressive benefit.

8. Is Disodium Hydrogen Citrate safe during pregnancy?

   Use during pregnancy should be under direct medical supervision. While systemic absorption is modest sodium loading may contribute to fluid retention and blood pressure elevation in pregnant women. The doctor should weigh the clinical need against the potential impact of sodium load on the mother and foetus.

9. Can Disodium Hydrogen Citrate be given to children?

   The syrup formulation is suitable for paediatric use with weight based dosing determined by the doctor. Children with recurrent UTIs or renal tubular acidosis are common recipients. Renal function & electrolytes should be monitored regularly particularly in children with underlying kidney conditions receiving prolonged courses.

10. What precautions should be taken before using Disodium Hydrogen Citrate?

    Assess renal function, baseline electrolytes and blood pressure before initiating. Avoid in severe renal impairment, metabolic alkalosis and sodium-restricted patients. Always dilute adequately. Do not use as a substitute for antibiotic therapy in bacterial UTI. Inform the doctor of concurrent cardiac or renal conditions.

References

1. Grases F, Costa-Bauzá A, Ramis M, Montesinos V, Conte A. Simple classification of renal calculi closely related to their micromorphology and etiology. Clin Chim Acta. 2002;322(1-2):29-36.

2. Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014;192(2):316-324.

3. Pak CY. Citrate and renal calculi: an update. Miner Electrolyte Metab. 1994;20(6):371-377.

4. Rodriguez Soriano J. Renal tubular acidosis: the clinical entity. J Am Soc Nephrol. 2002;13(8):2160-2170.

5. Naber KG, Bergman B, Bishop MC, et al. EAU guidelines for the management of urinary and male genital tract infections. Eur Urol. 2001;40(5):576-588.

6. Barbul A, Ulreich S. Urinary alkalinisation and the relief of symptoms in lower urinary tract infection. Pharm J. 1990;244:506-507.

7. Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 clinical practice guideline for the evaluation and management of chronic kidney disease. Kidney Int. 2024;105(4S):S117-S314.

8. Remer T, Manz F. Potential renal acid load of foods and its influence on urine pH. J Am Diet Assoc. 1995;95(7):791-797.

Dr. Vijay Kumar Singh

Consultant - Renal Care

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