Antidote locations & dosages for RHCG

Warning

Antidote locations poster

Antidotes, indications & locations.

NOTE: This table is not a substitute for consulting TOXBASE +/- NPIS. You should always consult Toxbase for patients who have taken a confirmed or suspected overdose /harmful substance.

References:

Royal College of Emergency Medicine (2017). RCEM Guidelines on Antidote Availability 

TOXBASE

Antidote Administration Guide

In all situations advice from On-Call Pharmacy is available,

Please call via switchboard and ask for on-call pharmacy for RHC

Dosing to be guided by Toxbase with strong consideration of discussion with NPIS [0344 892 0111]and mandatory involvement of ED Consultant

Medusa (Injectable medicines guide website) is here or search “Paediatric Intravenous Medicines Monographs” on Staffnet and click through to full medusa website.

If child less than 6 months also consult WoS Neonatal Monographs and discussion On-Call Pharmacy mandatory

Toxbase log in is on the computers in resus and majors, log in will be required to access links

Antidote

Administration

References

Acetylcysteine

As per RHC SNAP guideline

RHCG Paracetamol overdose guidance - 12-hr shortened N-acetylcysteine dosing schedule (SNAP protocol) | NHSGGC

 

Activated Charcoal

Usually 1g/ Kg, toleration is a significant issue as is rises of aspiration, MUST be discussed with ED Consultant prior to being given

Toxbase entry:

Oral activated charcoal

Andexanet Alfa

D/W On-Call Haematology before administering

add 20ml water for injection to vial swirl (do not shake). Final concentration 200mg/20ml. Must be given through an inline 0.2micron filter.

 

 

 

 

 

 

 

 

Atropine

No dilution needed, give neat

BNF Atropine sulfate | Drugs | BNFC | NICE

and Toxbase Atropine - antidote

Calcium Chloride

Danger of injury if extravasates, ensure as wide-bore cannula as possible and central line ideally

Stocked in Resus

10mmol in 10ml (14.7%) & 10% 10ml pre-filled syringe

Can be given neat

Toxbase advises bolus over 3-5 minutes

Calcium chloride/calcium gluconate - antidote

 

 

 

 

 

 

Medusa IV guide entry

Calcium Folinate/ Folinic Acid

 

Dosing depending on surface area, see BNFc appendix and toxbase link for dosing.

 

Bolus over 2 minutes or Infusion over 30mins with a max rate of infusion 150mg/minute.

Can be given neat for injection, infusion dilute to a convenient volume with either Sodium Chloride 0.9% or Glucose 5%.

Body surface area in children (image) | Medicines guidance | BNFC | NICE

 

Folinic acid - calcium folinate or disodium folinate - antidote

 

 

Medusa IV Guide entry

 

Calcium Gluconate

 

Dilute with sodium chloride 0.9% or glucose 5%.

IV injection and IV infusion: Dilute each 1mL of calcium gluconate 100mg per

1mL (0.22mmol of calcium in 1mL) with 4mL diluent (final concentration obtained is

0.045mmol in 1mL).

Concentrations greater than 0.045mmol in 1mL should be given via a central venous access device.

IV injection over 5-10 minutes with cardiac monitoring

NHS GG&C Paediatric Monograph

Calcium Gluconate Monograph

Calcium Gluconate Gel

Apply topically or subcutaneously

Toxbase entry:

Calcium gluconate - antidote

Cyproheptadine

Give orally down NG Tube,

tablets can be crushed and mixed with 15-30ml of water for administration, always flush NG tube post dose with 10ml of water

Newt Guideline: NEWT Guidelines - Admin of Tablets

Dantrolene

Reconstitute each 120mg vial with 20ml water for injection. Shake until no particles – do not use if the solution contains particles.

Give over at least one minute. This has a high pH – give centrally If possible if not should be given via a large peripheral vein and monitor site closely.

Dosing via Toxbase table Dantrolene - antidote

 

 

 

Medusa IV Guide

Desferrioxamine

Dilution:

For intravenous or subcutaneous infusion, reconstitute powder with Water for Injection to a concentration of 100 mg/mL; dilute with Glucose 5% or Sodium Chloride 0.9%.

Rate:

give 15 mg/kg body weight/hour intravenously until 80mg/kg has been given and then reassess, if not resolved can continue for a further 4 hours

BNF directions for administration Desferrioxamine mesilate | Drugs | BNFC | NICE

And Toxbase entry for rate

Desferrioxamine - antidote

Digoxin specific antibody (Digibind or Digifab)

Each vial should be reconstituted with 4 mL of sterile water by gentle mixing (Toxbase)

Give as slow IV bolus over 3-5 minutes

 

Digoxin Specific Antibody fragments (DigiFab) for poisoning from cardiac glycosides other than pharmaceutical digoxin

Flumazenil

No dilution needed

See Toxbase entry for dosing, speed and advised timing of dosing

Flumazenil - antidote

Fomepizole

See toxbase entry and will require discussion with NPIS

Fomepizole - antidote

Glucagon

Can use neat.

See toxbase, only use 5% glucose for dilution if required for infusion

Glucagon | Drugs | BNFC | NICE

Glucagon - antidote

Glyceryl Trinitrate

For continuous intravenous infusion, dilute to max. concentration of 400 micrograms/mL (but concentration of 1 mg/mL has been used via a central venous catheter) with Glucose 5% or Sodium Chloride 0.9%.

Glyceryl trinitrate | Drugs | BNFC | NICE

 

Adult GTN Monograph

Hydroxocobalamin

Reconstitute with 0.9% Sodium Chloride and give over 15 minutes

Dose of 70mg/kg, 5g max dose

DO NOT give Cyanokit in the same IV line (cannula) as other drugs

Hydroxocobalamin - antidote

Idarucizumab

D/W Haematology Consultant

 

Insulin (actrapid)

When using for high-dose insulin eugylcaemia therapy, use Actrapid neat at 1 unit/ kg

See toxbase for infusion details.

D/W NPIS On-call prior to using

Limited information regarding use in children but all current information suggest using similar doses to adults.

High Dose Insulin Euglycaemic Therapy - Adults only

 

 

Intralipid 20%

See toxbase for dosing tables

Intralipid doses

Levocarnitine (L-Carnitine)

Dosing table on Toxbase

L-carnitine - antidote

Lorazepam

From BNFc dilute with an equal volume of Sodium Chloride 0.9% (for neonates, dilute injection solution to a concentration of 100 micrograms/mL). Give into a large vein over 3–5 minutes; max. rate 50 micrograms/kg over 3 minutes.

Lorazepam | Drugs | BNFC | NICE

Magnesium

Dilute to 10% (100 mg magnesium sulfate heptahydrate (0.4 mmol Mg2+) in 1 mL) with Glucose 5% or 10%, Sodium Chloride 0.45% or 0.9% or Glucose and Sodium Chloride combinations

For Torsades de Pointes give as IV bolus over 3-5 minutes

If less emergency indication use protocol for IV Magnesium for acute wheeze Acute wheeze: escalation to intravenous therapy for Acute Wheeze Integrated Care Pathway (ICP) for patients over 2 years old (1128) | Right Decisions

Magnesium sulfate | Drugs | BNFC | NICE

 

Optimal administration dosage of magnesium sulfate for torsades de pointes in children with long QT syndrome - PubMed

 

Mesna

Dose as per individual treatment protocol, D/W On-Call Haematology/ Oncology Consultant as required

 

Methylthioninium Chloride

(Methylene Blue)

dosing on toxbase

Methylthioninium chloride - antidote

 

Midazolam

Give dose over 3 minutes, do not need to dilute

Midazolam Monograph

Naloxone

IV bolus

Can be given neat or diluted to convienient volume with 0.9% NaCL or 5% GLucose, suggest 4-10ml and titrate dose as required

IV Infusion: see monograph

Naloxone Monograph

Octreotide

Dosing from toxbase, (1-1.5mg/kg), dilution from bnf

For intravenous injection or intravenous infusion, manufacturer advises dilute requisite dose to a ratio of at least 1:1 and up to a maximum of 1:9 by volume with Sodium Chloride 0.9% ?need to specify ration

Octreotide | Drugs | BNFC | NICE

 

Octreotide - antidote

Phytomenadione (Vitamin K1)

Slow IV injection, don’t need to dilute

Vit K Monograph

Phytomenadione - antidote

Procyclidine

Fine to go neat should be given over at least 3 minutes

 

Protamine Sulphate

See instructions on Toxbase depending if reversing LMWH or Unfractionated heparin

Protamine - antidote

Pyridoxine

See toxbase

Pyridoxine - antidote

Sodium Bicarbonate 8.4%

See monograph

Sodium Bicarbonate monograph

Sodium Bicarbonate 1.26%

As 8.4%

 

Sodium Thiosulphate

See toxbase entry

Sodium thiosulphate - antidote

European Viper Antivenom

Toxbase has doses on both formulations and oncall pharmacy will supply the vials-Please ensure oncall pharmacy are aware this is EUROPEAN viper antivenom as this needs to be typed in the Pharmacy system properly in order to find a supply.

 

Editorial Information

Last reviewed: 15/09/2025

Next review date: 30/09/2028

Author(s): Dr Jamie Pope, Consultant in Emergency Medicine and Paediatric Emergency Medicine, RHCG and QEUH Glasgow.

Approved By: Mrs Susan Kafka, Lead Clinical Pharmacist, RHCG & Mrs Jennifer Kimmins, PICU pharmacy technician, RHCG