1. Clinical & Scientific Overview
Calcium Gluconate (10% IV Cardioprotective & Hypocalcaemia Injection) (TIP-MED-000269, Reference Code [12.37]) is classified under
Vaccines, Immunologicals & Emergency Toxicology Antidotes (Ch 12) as a Parenteral Calcium Salt (Myocardial Membrane Stabiliser & Electrolyte Antidote).
Within the Indian regulatory and compendial framework, it is governed under Schedule H Prescription Drug (To be sold by retail on the prescription of a Registered Medical Practitioner only — Drugs Rules 1945).
Representative Indian Market Examples (Edition 2.7 Ch 12 [12.37], p. 173): Calcinol Inj, Calcium Sandoz Inj (10% w/v) — Strengths & Dosage Forms: Injection: 10% w/v Calcium Gluconate in 10 mL ampoule (= 1 g Calcium Gluconate = 93 mg [2.25 mmol / 4.65 mEq] of elemental Ca2+).
Injection: 10% w/v Calcium Gluconate in 10 mL ampoule (= 1 g Calcium Gluconate = 93 mg [2.25 mmol / 4.65 mEq] of elemental Ca2+).
3. Mechanism of Action & Pharmacodynamics
In hyperkalaemia, restores the voltage gradient between resting membrane potential and threshold potential in cardiomyocytes within 1–3 minutes (does NOT lower serum potassium—must be followed by Insulin+Dextrose); directly antagonises excess Mg2+ at neuromuscular junctions.
4. Therapeutic Indications & Evidence-Supported Uses
- First-line immediate myocardial cardioprotection in severe hyperkalaemia (K+ >=6
- 5 mmol/L or ECG changes)
- emergency antidote for Magnesium Sulphate toxicity in eclampsia
- acute symptomatic hypocalcaemic tetany
- calcium channel blocker (Verapamil/Diltiazem/Amlodipine) overdose
- massive blood transfusion citrate toxicity
🇮🇳 Jurisdiction & Indication Note: Indications and schedules reflect Indian compendial and regulatory records (CDSCO / Indian Pharmacopoeia & NFI / NLEM 2022). Where international reference labels (US FDA DailyMed / NCBI StatPearls) are cited for pharmacokinetic or mechanistic parameters, international approvals do not automatically imply CDSCO approval in India.
5. Educational Dosage Context, Formulations & Administration
Educational Dosing & Regimen Summary: Adult: Severe Hyperkalaemia / Magnesium Toxicity: 10 mL (1 g) of 10% Calcium Gluconate slow IV over 3–5 minutes (up to 10 min) with continuous ECG monitoring; in hyperkalaemia, may repeat after 5–10 minutes if ECG changes (peaked T waves, widened QRS, sine wave) persist. Acute Hypocalcaemic Tetany: 10–20 mL (1–2 g) slow IV over 10 min, followed by continuous infusion of 50 mL (5 g) in 500 mL 5% Dextrose or 0.9% NaCl over 12–24 hours. • Paediatric: Hyperkalaemia / Hypocalcaemic Seizures: 0.5–1 mL/kg (50–100 mg/kg; max 10–20 mL) of 10% Calcium Gluconate slow IV over 5–10 minutes with ECG monitoring.
Administration & Meal Timing: See Administration & Counselling below. | Standard clinical schedule per indication.
6. Pharmacokinetics, Metabolism & Renal/Hepatic Adjustment
Absorption, distribution, metabolism, and excretion follow class pharmacokinetic profile; verify patient renal/hepatic function.
Renal: Safe and mandatory in hyperkalaemic renal failure; check serum phosphate before chronic infusions to avoid metastatic calcification. • Hepatic: Preferred over Calcium Chloride in liver disease (gluconate does not require hepatic metabolism to release ionized Ca2+).
Renal: Safe and mandatory in hyperkalaemic renal failure; check serum phosphate before chronic infusions to avoid metastatic calcification. • Hepatic: Preferred over Calcium Chloride in liver disease (gluconate does not require hepatic metabolism to release ionized Ca2+).
Renal: Safe and mandatory in hyperkalaemic renal failure; check serum phosphate before chronic infusions to avoid metastatic calcification. • Hepatic: Preferred over Calcium Chloride in liver disease (gluconate does not require hepatic metabolism to release ionized Ca2+).
7. Contraindications, Precautions & High-Risk Warnings
- Contraindications: Hypercalcaemia; ventricular fibrillation during CPR; concomitant or rapid IV administration in a patient with suspected DIGOXIN TOXICITY. • Precautions: THREE CRITICAL HIGH-ALERT RULES: (1) NEVER give rapid IV push (>2 mL/min)—causes peripheral vasodilation, hypotension, bradycardia, syncope, and cardiac arrest ('chalk-like taste and heat wave'); (2) NEVER mix in the same IV line with SODIUM BICARBONATE, Phosphate, or Ceftriaxone (precipitates insoluble Calcium Carbonate/Ceftriaxone stones in the IV tubing and lungs!); (3) Extravasation causes tissue necrosis and calcinosis cutis (though 10% Calcium Gluconate is 3x safer on peripheral veins than 10% Calcium Chloride, which contains 272 mg elemental Ca2+/10 mL and requires a central line).
Key Clinical Precautions: Renal: Safe and mandatory in hyperkalaemic renal failure; check serum phosphate before chronic infusions to avoid metastatic calcification. • Hepatic: Preferred over Calcium Chloride in liver disease (gluconate does not require hepatic metabolism to release ionized Ca2+).
8. Adverse Effects Profile
- Intense flushing, warm sensation, chalky/metallic taste, nausea, tingling.
- Bradycardia, sinus arrest, hypotension (rapid injection), tissue sloughing/necrosis on extravasation.
- Monitor for severe hypersensitivity, organ toxicity, or dose-limiting adverse events.
9. Major Drug–Drug, Drug–Food & Drug–Herb Interactions
- Digoxin -> intravenous calcium potentiates myocardial digoxin toxicity and can precipitate fatal arrhythmias ('stone heart'—if indispensable in a patient on digoxin, infuse very slowly over 30–60 minutes); Ceftriaxone -> fatal intravascular precipitation in neonates (CONTRAINDICATED within 48h in neonates); Sodium Bicarbonate -> immediate white chalk precipitate in IV line
10. Clinical Monitoring, Patient Counselling & Storage
Clinical & Laboratory Monitoring: Monitor clinical response, baseline renal/hepatic parameters, and relevant serum biomarkers.
Pharmacist Patient Counselling Points:
- Patient Counselling Checklist: Inform conscious patient that a brief hot flush and chalky taste in the mouth during the slow injection are expected.
- Meal & Clock Timing Instruction: See Administration & Counselling below. (Standard clinical schedule per indication.)
- Missed Dose Protocol: Take as soon as remembered unless close to next scheduled dose; never double the dose.
- Geriatric Dispensing Pearl: Schedule: Schedule H | NLEM 2022: Yes | Compendia: IP 2026 / NFI 7th Ed 2026 / NLEM 2022 / CDSCO Schedule H / BNF 90th Ed
Storage, Stability & Dispensing Safeguards: Store below 25°C–30°C in original moisture- and light-resistant packaging out of reach of children. Available forms: Injection: 10% w/v Calcium Gluconate in 10 mL ampoule (= 1 g Calcium Gluconate = 93 mg [2.25 mmol / 4.65 mEq] of elemental Ca2+).
11. Visual Pharmacology & Mechanism Diagram (svg-v339-01-adme-12-step-journey)
12. Authoritative References, Regulatory Sources & Editorial Disclaimer
Primary Compendial & Guideline Reference: Indian Pharmacist Desk Reference — Professional Edition 2.7 (2026–27) • Ch 12 [12.37] (p. 173)
Official Verification Portals: Indian Pharmacopoeia Commission (IPC) & National Formulary of India (NFI) • Central Drugs Standard Control Organization (CDSCO) • Ministry of Health & Family Welfare — NLEM 2022 • NCBI Bookshelf / StatPearls Pharmacology Reference • DailyMed (US FDA Official Prescribing Reference)
Last Medically & Pharmaceutically Reviewed: 2026-11-10 • Verification Status: HANDBOOK_SOURCE_CONTENT
Educational & Clinical Disclaimer: This reference profile is published solely for pharmacy education, academic study, and professional clinical reference. It does not substitute for patient-specific clinical judgement, qualified specialist oncology/medical supervision, or official CDSCO/IP prescribing information. Never self-medicate with prescription, Schedule H/H1/X, NDPS, or oncology medicines.
13. Related Reference Monographs, Educational Guides & Visual Concept
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