Cyanokit is the brand formulation of hydroxocobalamin for intravenous use and is indicated as an emergency antidote for known or suspected cyanide poisoning. Cyanide exposure most commonly arises from closed-space smoke inhalation in fires, ingestion or inhalation of cyanide salts, or dermal exposure; clinical signs prompting treatment include confusion, respiratory distress, dilated pupils, nausea/vomiting, chest tightness and seizures. Cyanokit is supplied as a dark red lyophilized powder (5 g per vial) intended for rapid reconstitution and IV administration under direct medical supervision.
This review draws on the drug monographs and clinical summaries from Mayo Clinic, Drugs.com, RxList, MSKCC patient information, StatPearls, and the Cyanokit manufacturer information summarizing clinical adverse events and kit contents. Key factual details used here include the packaged 5 g vial, recommended reconstitution volumes and concentration, reported adverse events and the manufacturer’s study counts for common events.
High-level verdict: Cyanokit is a clearly packaged, hospital-grade cyanide antidote with a well-defined reconstitution procedure (5 g reconstituted with 200 mL diluent to 25 mg/mL) and explicit emergency indications — its strengths are immediate availability in emergency settings and included administration hardware. The main drawbacks are predictable, frequently reported effects such as chromaturia and pink/red skin discoloration (reported in the manufacturer’s study), transient hypertension in some patients, and limited pediatric data; it must be given by or under direct physician supervision.
When is Cyanokit indicated?
Cyanokit (hydroxocobalamin) is indicated for emergency treatment of known or suspected cyanide poisoning. Clinical scenarios cited in the sources include smoke inhalation from closed-space fires, ingestion or inhalation of cyanide, and dermal exposure — acute signs prompting treatment include rapid or shallow breathing, confusion, seizures, nausea/vomiting, chest tightness and dilated pupils.
Because cyanide poisoning is life-threatening, the drug is intended for immediate use in acute settings and should be administered only by or under direct supervision of a physician or qualified clinician.
What’s in the Cyanokit package and how is it prepared?
The Cyanokit package contains one 5 g vial of lyophilized hydroxocobalamin, a transfer spike, an intravenous administration set, a quick use reference guide and a package insert. Per the product information, the 5 g vial is reconstituted with 200 mL of 0.9% NaCl (or, if unavailable, Lactated Ringer’s or D5W) to give a dark red solution at 25 mg/mL.
The reconstituted product has a pH range of 3.5 to 6.0. The kit’s included spike and IV set are intended to speed bedside preparation in emergency situations; diluent is not included in the Cyanokit package.
Known side effects and important warnings
Manufacturer-reported common adverse events in their study included chromaturia (n=6), pink or red skin discoloration (n=4), hypertension (n=3) and erythema (n=2). These effects — particularly urine and skin discoloration — are distinctive and commonly noted after administration.
Additional precautions in the referenced sources: Cyanokit must be administered under direct medical supervision, breastfeeding is not recommended while receiving treatment for cyanide poisoning (per MSKCC guidance), and appropriate pediatric studies have not been performed on the relationship of age to effects of intravenous hydroxocobalamin according to the Mayo Clinic monograph.
How is Cyanokit given and by whom?
Cyanokit is intended for IV infusion after reconstitution. The RxList description specifies reconstitution of the 5 g vial with 200 mL diluent to 25 mg/mL; the kit contains the mechanical components (transfer spike and administration set) to facilitate rapid IV administration in emergency settings.
Because cyanide poisoning requires immediate clinical decision-making, administration is designed for emergency departments, critical care teams and similarly trained responders and should not be used outside of clinician supervision.
Practical limitations and special population notes
Pediatric data are limited — the Mayo Clinic monograph notes that appropriate studies have not been performed on age-related effects. Clinicians should therefore exercise additional caution and consult treatment protocols for pediatric dosing where available.
Breastfeeding is contraindicated during treatment for cyanide poisoning with this agent per MSKCC guidance, and the vivid red color of the reconstituted solution will commonly cause urine and skin discoloration, which may complicate clinical assessments if not anticipated.
Pros & Cons
- ✅ Packaged 5 g lyophilized vial with dedicated transfer spike and IV administration set included for rapid bedside preparation
- ✅ Reconstitute 5 g with 200 mL 0.9% NaCl (or LR/D5W) to a concentration of 25 mg/mL per product labeling
- ✅ Indicated specifically for acute cyanide poisoning from smoke inhalation, ingestion, inhalation or dermal exposure — designed for emergency use
- ✅ Clear reporting of common adverse events in manufacturer data (chromaturia n=6; pink/red skin discoloration n=4; hypertension n=3; erythema n=2) helps set expectations
- ✅ Reconstituted product pH reported between 3.5 and 6.0, giving predictable chemical properties for IV use
- ❌ Causes distinctive chromaturia and pink/red skin discoloration (reported in manufacturer study), which can alarm patients and complicate visual assessments
- ❌ Transient hypertension reported (n=3 in manufacturer data) and other infusion-related reactions are possible
- ❌ Limited pediatric safety data — appropriate age-related studies have not been performed according to Mayo Clinic labeling
- ❌ Not recommended for breastfeeding during treatment per MSKCC guidance
- ❌ Must be given by or under direct supervision of a physician, limiting out-of-hospital autonomous use
How It Compares to the Competition
- Nithiodote (sodium nitrite/sodium thiosulfate kit) — Alternative emergency cyanide antidote kit that uses a nitrite/thiosulfate approach rather than hydroxocobalamin in kit form.
- Sodium thiosulfate injection (single-agent) — Used clinically as a cyanide detoxifying agent in some protocols; differs from Cyanokit’s hydroxocobalamin chemistry and packaging.
- Cobinamide (investigational antidote) — An investigational cobalt-based antidote studied as an alternative to hydroxocobalamin; not the standard packaged kit in routine clinical use.
Who Should Buy This & Who Should Skip It
Buy it if: Emergency departments, critical care teams, and prehospital emergency services that manage smoke-inhalation and acute toxic exposures should stock Cyanokit for immediate treatment of known or suspected cyanide poisoning. Facilities needing a ready-to-use, 5 g IV antidote with included administration hardware will find the packaged kit appropriate.
Skip it if: Non-clinical settings, outpatient clinics without immediate physician supervision, and anyone seeking oral vitamin B12 therapy should skip this product — Cyanokit is for acute IV emergency use only. Facilities treating primarily pediatric patients without pediatric dosing protocols should consider alternatives or specialist consultation due to limited pediatric data.
Search Purchase Options
Use these links to search for Cyanokit (hydroxocobalamin) on trusted marketplaces. The links open in new tabs; if you buy through them, we may earn a commission at no extra cost to you.
* Affiliate links: you pay the same price either way.