An IV calcium salt used for hyperkalemia, calcium channel blocker overdose, hydrofluoric acid exposure, hypocalcemia from massive transfusion, and as part of damage-control resuscitation in trauma. Calcium gluconate is preferred over calcium chloride for peripheral IV administration due to lower risk of extravasation injury. The 2026 TCCC guidelines emphasize calcium administration during blood product resuscitation.

Pharmacology and Actions

Calcium is an essential cofactor in coagulation (Factor IV), cardiac contractility, neuromuscular function, and many enzymatic reactions. In hyperkalemia, calcium stabilizes the cardiac myocyte membrane potential, reducing arrhythmia risk without changing serum potassium. In calcium channel blocker overdose, calcium overcomes the channel blockade. In hydrofluoric acid exposure, calcium binds free fluoride ions, neutralizing toxicity. In massive transfusion, citrate in stored blood products chelates serum calcium, producing ionized hypocalcemia that impairs coagulation and cardiac function; supplemental calcium restores ionized levels.

Indications

Hyperkalemia with ECG changes (cardiac membrane stabilization)
Calcium channel blocker overdose
Hydrofluoric acid exposure (dermal, ocular, ingestion)
Hypocalcemia from massive transfusion or citrate toxicity
Hypermagnesemia with cardiac effects
TCCC 2026 damage-control resuscitation (after first transfused blood product)
Cardiac arrest with suspected hyperkalemia or calcium channel blocker overdose

Absolute Contraindications

Hypercalcemia
Concurrent ceftriaxone administration through same IV line (precipitation)
Digitalis toxicity (worsens cardiac arrhythmias)
Ventricular fibrillation (unless hyperkalemia-related)

Precautions and Side Effects

Extravasation can cause severe tissue necrosis; verify IV patency before administration. Calcium gluconate is less injurious than calcium chloride if extravasation occurs, which is why it is preferred for peripheral IV use. Hypotension and bradycardia can occur with rapid IV push; administer slowly. Hypercalcemia from excessive dosing produces neurologic and cardiac effects. Cannot be administered through the same IV line as ceftriaxone (precipitation causing line occlusion and potential embolism).

Adult Dosing

IV / IO

Hyperkalemia: 1 gram (10 mL of 10 percent solution) IV over 2 to 5 minutes. May repeat in 5 to 10 minutes if ECG changes persist. Calcium channel blocker overdose: 1 to 3 grams IV initial, may repeat. Massive transfusion / TCCC 2026: 1 gram IV after first transfused unit of blood product. Hydrofluoric acid: 10 to 20 mL of 10 percent solution IV; topical or local infiltration for dermal exposure. Onset: Within 1 to 3 minutes (cardiac membrane stabilization in hyperkalemia)

Not recommended for IM administration (calcium chloride contraindicated IM; gluconate IM is painful and less effective than IV).

Oral calcium not used in acute resuscitation; supplements for chronic management.

Pediatric Dosing

Pediatric hyperkalemia: 100 mg/kg (1 mL/kg of 10 percent solution) IV/IO over 5 minutes, maximum 1 gram. Pediatric calcium channel blocker overdose: 100 mg/kg IV/IO, may repeat. Always slow IV/IO push to avoid bradycardia and asystole.

Pharmacokinetics

Peak Effect: IV: 5 to 10 minutes for membrane stabilization. Hyperkalemia ECG changes typically improve within 5 minutes.

Duration: 30 to 60 minutes for membrane stabilization effect in hyperkalemia (does not lower serum potassium; bridge to definitive therapy)

Storage and Handling

Store at controlled room temperature (15 to 30 degrees Celsius). Avoid freezing. Protect from light. Stable in standard EMS bag environments. Crystallization can occur with cold exposure; warm vials gently if crystals are visible (do not use boiling water).

Reconstitution:

Calcium gluconate is supplied as 10 percent solution (100 mg/mL or 1 gram per 10 mL ampule). No reconstitution required. May be further diluted in NSS or D5W for slow infusion if protocol allows. Do not mix in the same syringe or line with bicarbonate (precipitation) or ceftriaxone (precipitation).

TCCC and TECC Role

Calcium gluconate has assumed a prominent role in TCCC 2026 damage-control resuscitation, with the guidelines specifying 1 gram IV after the first transfused unit of blood product. The rationale is the well-documented citrate-induced hypocalcemia that develops with stored blood transfusion, impairing coagulation and cardiac function in already-coagulopathic trauma casualties. PA Statewide ALS Protocols include calcium for hyperkalemia, calcium channel blocker overdose, and hydrofluoric acid exposure indications. PA Protocol 6095 (Blood Administration, optional 2023 addition) addresses calcium administration during transfusion where the protocol is adopted by the agency.

Field Context

Calcium gluconate is the calcium salt for peripheral IV use; calcium chloride is preferred only when central or large peripheral access is available, due to higher elemental calcium content but greater extravasation injury risk. The 2026 TCCC inclusion of calcium with transfused blood products reflects the modern understanding of damage-control resuscitation: trauma coagulopathy is worsened by citrate-induced hypocalcemia, and calcium administration is a low-cost intervention with meaningful effect. For hyperkalemia with ECG changes, calcium is bridge therapy that stabilizes the heart while definitive treatments (insulin/glucose, albuterol, dialysis) reduce potassium. Never run calcium through the same line as ceftriaxone.

Common Mistake

Running calcium gluconate through the same IV line as ceftriaxone without flushing thoroughly, causing precipitation, line occlusion, and potential embolic complications. Always sequence ceftriaxone and calcium administration separately or through separate IV lines. The other common error is rapid IV push, which can cause bradycardia and asystole, particularly in patients with bradycardia or on digitalis; administer over 2 to 5 minutes minimum.

Last Reviewed May 14, 2026

Reviewer TCCC 2026 Guidelines (01 May 2026); NREMT Paramedic Drug List; FDA labeling.

Drug Class Electrolyte / Fluid

DEA Schedule Not Controlled

Mission Impact Not Applicable - Patient Already Non-Operational

Reference Category TCCC Doctrine, Standard EMS, ALS Only, Hospital / Critical Care

Generic Name Calcium gluconate

Source: Tactical Combat Casualty Care (TCCC) Guidelines, 01 May 2026, Committee on Tactical Combat Casualty Care, Joint Trauma System.

Reference URL: https://penntacticalsolutions.com/pages/drug-reference/calcium-gluconate

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Educational reference for trained medical providers. Not medical advice. Not a substitute for formal training, current published guidelines, or medical direction. Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances require additional storage, accountability, and documentation per DEA and state law.

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Verify dosing, indications, and contraindications against current published guidelines and your local protocols before administration. Confirm content currency against the source citation. Penn Tactical Solutions does not provide medical direction. Clinical responsibility rests with the administering provider, their medical director, and their agency.

Calcium Gluconate

Calcium gluconate

Electrolyte / Fluid

Not Applicable - Patient Already Non-Operational

Adult Dosing

IV/IO	Hyperkalemia: 1 gram (10 mL of 10 percent solution) IV over 2 to 5 minutes. May repeat in 5 to 10 minutes if ECG changes persist. Calcium channel blocker overdose: 1 to 3 grams IV initial, may repeat. Massive transfusion / TCCC 2026: 1 gram IV after first transfused unit of blood product. Hydrofluoric acid: 10 to 20 mL of 10 percent solution IV; topical or local infiltration for dermal exposure. (Within 1 to 3 minutes (cardiac membrane stabilization in hyperkalemia))
IM	Not recommended for IM administration (calcium chloride contraindicated IM; gluconate IM is painful and less effective than IV).
PO	Oral calcium not used in acute resuscitation; supplements for chronic management.

Pediatric

Contraindications

Hypercalcemia| Concurrent ceftriaxone administration through same IV line (precipitation)| Digitalis toxicity (worsens cardiac arrhythmias)| Ventricular fibrillation (unless hyperkalemia-related)

Common Mistake

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