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Narcan Naloxone HCL 4 mg/.1mL Spray, 2 vials — NDC 51662-1642-02 package photo
Label image from the product's FDA listing (DailyMed) — may show a different pack size or an older label revision.

Narcan Naloxone HCL 4 mg/.1mL Spray, 2 vials — NDC 51662-1642-2 (Billing 51662-1642-02)

by HF Acquisition Co LLC, DBA HealthFirst · 2 VIAL, SINGLE-DOSE in 1 CARTON / .1 mL in 1 VIAL, SINGLE-DOSE

This is a package of 2 vials of Narcan Naloxone HCL 4 mg/.1mL Spray from HF Acquisition Co LLC, DBA HealthFirst, marketed since Aug 2023 and currently FDA-listed. It is this product's only package size.

NDC 51662-1642-02
🏷️ FDA NDC (as labeled) 51662-1642-2 billing pads the package segment with a zero
OTC Brand On market Non-controlled ⇄ Compare with another NDC
🗂️ FDA directory synced Oct 1, 2026 · this listing last changed Jul 24, 2026 · sources: openFDA · FDA label (DailyMed) · FDA Orange & Purple Book · First Databank · CMS NADAC, ASP, Medicare & Medicaid · RxNorm
📋 All sources & update times →

This page is curated, coded, and maintained by

Compiled from public FDA, CMS, DailyMed, NADAC, and related drug data sources. Editorial policy

NDC database record

One package, one record: these facts belong to NDC 51662-1642-2 alone.

Record
FDA NDC Directory package listing · Human OTC drug
Code segments
51662 labeler · 1642 product · 2 package
Package marketed since
Aug 28, 2023
Sample package
No — commercial package
Listing certified through
Dec 31, 2026
Barcode (UPC-A, from the NDC)
3 5166216422 8
FDA record last changed
Jul 24, 2026

Identity & classification

Regulatory identifiers FDA, NLM and CMS codes for this package

FDA NDC (as labeled) 51662-1642-2
Product NDC 51662-1642
11-digit billing NDC 51662164202
UNII F850569PQR
Application # NDA208411
SPL Set ID 11d770b8-b768-ba3d-e063-6394a90a61a6
Established class (EPC) Opioid Antagonist
Mechanism of action Opioid Antagonists
DEA schedule Non-controlled
Marketing category NDA
Marketing status On market
FDA listing status Listed (active directory)
Marketing start 2023-08-28
Route NASAL
Dosage form SPRAY
Substance NALOXONE HYDROCHLORIDE
Why two NDCs? The FDA registers this code as 51662-1642-2 — a 5-4-1 layout, and that's what's printed on the package and shown on DailyMed. For insurance claims, every NDC is standardized to a uniform 11-digit 5-4-2 format by adding a zero to the package segment → 51662-1642-02. Same drug, same package — only the format differs.
Where does this data come from?
Identifiers from the FDA openFDA NDC Directory and Structured Product Labeling; RxCUI from RxNorm (NLM); GPI from Medi-Span; GCN / HIC / AHFS / legend from First Databank.

Clinical

📗 Our plain-language guide HelloPharmacist
  • It is an emergency medicine that reverses an opioid overdose. Signs include very slow or stopped breathing and being unresponsive. Some injection forms have extra hospital or milit...
  • Follow the instructions that came with your product. Nasal sprays go into one nostril. Zimhi goes into the outer thigh. Call 911 right away. If the person does not wake up or slips...
  • Naloxone can wear off before the opioid does. Breathing problems can come back. Stay with the person until emergency help arrives.
  • Why do I still need to call 911 if they wake up?
📖 Read our full Naloxone guide →

Supplement & herbal interactions

🌿 Drug–supplement interaction checker →
Where does this data come from?
Plain-language summary from MedlinePlus (U.S. National Library of Medicine); supplement & herbal interactions and nutrient depletion data from the Natural Medicines database; our full guide is HelloPharmacist editorial content.

Pricing

A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.

Price systemPer mLPer package
Retail pharmacies payNADAC · weekly Not in the retail survey — common for institutional, discontinued, or low-volume packs.
Medicaid paysCMS SDUD · 12 mo No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data.
Medicare drug plans payPart D · quarterly No Part D plan price is available for this NDC in our data.
ℹ️
No price is published for this exact package yet. CMS surveys NADAC per package size, so a different pack of the same drug often has one.
Where does this data come from?
NADAC (National Average Drug Acquisition Cost) is the CMS weekly pharmacy-acquisition-cost survey — what pharmacies pay. ASP (Average Sales Price) is the CMS Medicare Part B drug-payment file, published quarterly. Medicaid pays is computed by us from CMS State Drug Utilization Data (total reimbursed ÷ units, trailing 12 months) — gross of rebates and inclusive of dispensing fees, so it reflects what Medicaid paid, not an acquisition cost. Medicare drug plans pay is the median negotiated point-of-sale unit cost across plans listing this NDC in the CMS quarterly Prescription Drug Plan pricing files, before rebates. The VA pays is the federal contract price (FSS, and the statutory Big 4 ceiling where listed) from the VA National Acquisition Center pharmaceutical price file. All are free public government data; each measures a different payer, so the figures are not directly comparable.

Packaging — all sizes for this product

Package NDCDescription Marketing startMarketing endStatus
51662-1642-02 You're viewing this Main listing 2 VIAL, SINGLE-DOSE in 1 CARTON / .1 mL in 1 VIAL, SINGLE-DOSE 2023-08-28 — Active

Therapeutic equivalents

ProductLabelerPackNADAC/unitTEStatusPrice vs. this
Narcan Naloxone HCL 4 mg/.1mLthis 51662-1642-02 HF 2 vials — — FDA listed —
About this product: this is the brand-name version. Some generic versions are approved by the FDA, but we could not confirm current pharmacy availability from our pricing/market data.
Where does this data come from?
Equivalents are other NDCs of the same ingredient, form and route from the openFDA NDC Directory, ranked least-expensive-first by NADAC. Therapeutic-equivalence (AB) ratings come from the FDA Orange Book; biologics use the FDA Purple Book for biosimilar & interchangeable status.

Availability & generic status

🏛️
2023
On the market since
Aug 2023
📍
2026
Currently FDA-listed
3 years listed
🔒
·
Generic approved (availability unconfirmed)
see note
🔒Generic approved by FDA, but pharmacy availability is not confirmed

The FDA lists approved generic versions of this medicine, but that does not always mean a pharmacy can get one today. Patent rules, launch agreements, supply and pricing can affect when generics actually arrive.

Where does this data come from?
Patents and exclusivity from the FDA Orange Book (small-molecule drugs), refreshed from public FDA data. Generic launch timing is an estimate, not a guarantee.

Inactive Ingredients / Excipients

Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.

💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.

  • UNII F5UM2KM3W7
    Benzalkonium chloride is a chemical compound that works as a preservative and antimicrobial agent in medications. It prevents bacterial and fungal growth in liquid formulations to keep the product safe during storage and use.
  • UNII 7FLD91C86K
    Edetate disodium is a chemical compound that binds and removes certain metal ions. In medicines, it acts as a preservative and stabilizer by preventing metals like calcium from interfering with the product's shelf life and consistency.
  • UNII QTT17582CB
    A strong acid used to adjust and maintain the proper pH level in liquid medicines, ensuring stability and preventing breakdown of active ingredients.
  • UNII 451W47IQ8X
    Sodium chloride is common table salt. It's used in medicines as a buffer to maintain proper pH, as a filler to add bulk, or to adjust the osmotic balance in liquid formulations.
  • UNII 059QF0KO0R
    Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.

5 inactive ingredients listed in the exact product block matched to this NDC.

The official label also statesbenzalkonium chloride, edetate disodium, hydrochloric acid, sodium chloride, water

Label-section wording can be broader than the structured product block and may mention additional formulation ingredients.

Where does this data come from?
Data sourced from official FDA Structured Product Labeling (SPL) via DailyMed — ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.

Inactive ingredient FAQ

Are inactive ingredients the same for every manufacturer?
No. Inactive ingredients can differ by manufacturer, dosage form, strength, and package / product version.
Why might an inactive ingredient be missing?
Some SPLs do not provide a complete structured inactive-ingredient list, and older or unusual labels may only include the information in narrative text.
Can inactive ingredients matter?
Yes. They can matter for allergies, intolerances, dyes, gluten / lactose concerns, preservatives, and formulation differences — but confirm with a pharmacist or the manufacturer when it’s clinically important.

Manufacturer & labeler

LabelerHF Acquisition Co LLC, DBA HealthFirst
Application holderEMERGENT OPERATIONS IRELAND LTD
FDA applicationNDA208411 (NDA)
Labeler code51662
First marketedAug 2023
Product typeHuman Otc Drug
Portfolio333 products on file

More NDCs from HF Acquisition Co LLC, DBA HealthFirst labeler code 51662

The labeler markets the product; the application holder owns the FDA approval. They’re often the same company but can differ (e.g. a repackager or an authorized generic). A mailing address / phone appears here when the manufacturer includes it in the product’s FDA label (not all do).
Where does this data come from?
Labeler, application holder and registered establishment from the FDA openFDA NDC Directory and Drugs@FDA; address/contact from the product’s FDA label.

FDA label — Drug Facts FDA SPL

The complete FDA label for this product — the official Drug Facts labeling, verbatim, section by section. Jump with a chip, search within the label, or expand everything.
🎯 Indications and Usage ⏱️ Dosage and Administration ⚠️ Warnings 🧪 Active Ingredient 🧪 Inactive Ingredients 🎯 Purpose 📄 Keep Out of Reach of Children 📄 Questions or Comments 📄 Package Label / Principal Display Panel
🎯 Indications and Usage 24 words ▾

USES to “revive” someone during an overdose from many prescription pain medications or street drugs such as heroin this medicine can save a life

⏱️ Dosage and Administration 92 words ▾

DIRECTIONS For opioid emergencies, call 911. For questions on NARCAN, call 1-844-4NARCAN (1-844-462-7226) or go to WWW.NARCAN.COM . ©2023 Emergent Devices Inc. EMERGENT® and NARCAN® are registered trademarks of Emergent BioSolutions Inc, or its subsidiaries.

Other Information • store at room temperature or refrigerated, between 2°C to 25°C (36°F to 77°F) • do not freeze • avoid excessive heat above 40°C (104°F) • protect from light • the product is packaged in individually-sealed blisters. Do not use if the blister is open or torn, or if the device appears damaged. Directions Directions

⚠️ Warnings 26 words ▾

When using this product some people may experience symptoms when they wake up, such as, shaking, sweating, nausea, or feeling angry. This is to be expected.

🧪 Active Ingredient 9 words ▾

ACTIVE INGREDIENT (IN EACH SPRAY) Naloxone Hydrochloride 4 mg

🧪 Inactive Ingredients 9 words ▾

benzalkonium chloride, edetate disodium, hydrochloric acid, sodium chloride, water

🎯 Purpose 5 words ▾

Emergency treatment of opioid overdose

📄 Keep Out of Reach of Children 6 words ▾

keep out of reach of children

📄 Questions or Comments 7 words ▾

Call 1-844-4NARCAN (1-844-462-7226) or go to WWW.NARCAN.COM

📄 Package Label / Principal Display Panel 23 words ▾

PRINCIPAL DISPLAY PANEL- CARTON LABEL CARTON LABEL

PRINCIPAL DISPLAY PANEL_ NDC 51662-1642-1 pack RFID Label

PRINCIPAL DISPLAY PANEL- NDC 51662-1642-2 pack RFID Label

Source: FDA Structured Product Labeling, mirrored from DailyMed / openFDA. Prefer the government’s original formatting? View this label on DailyMed ↗

About this NDC listing & data coverage

Over-the-counter (OTC) product
What data is (and isn’t) available for this NDC — tap to expand
NDC identity (package / product / labeler codes) ✓ Available
Labeler ✓ Available
Product & package description ✓ Available
Marketing category & status ✓ Available
Active ingredient / dosage form / route ✓ Available
FDA label (SPL via DailyMed) ✓ Available
Package photos ✓ Available
Inactive ingredients (structured) ✓ Available
NADAC pharmacy acquisition price (CMS) — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey.
Orange Book / therapeutic-equivalence data — Not published for this NDC Applies only to products approved under an NDA/ANDA; many listings are out of scope.
HCPCS J-code billing crosswalk — Not published for this NDC Most self-administered / retail products have no J-code — that is normal.
Medicaid utilization (CMS SDUD) — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold.
“Not published” reflects what the public FDA / CMS / NLM sources provide for this exact package code — it is a property of the data feeds, not a judgment about the product.

Questions about this listing

Why is there no price listed?
The pricing shown on our NDC pages comes from CMS NADAC, a voluntary survey of retail community pharmacy invoices. CMS does not publish a NADAC for every NDC — packages outside the retail survey (institutional and hospital products, bulk packages, discontinued items, and many OTC items) may never receive one. A missing price reflects the survey's scope, not this product's actual cost, and does not mean the product is free or unavailable.
Is the NDC printed on the package the same as the 11-digit billing NDC?
Yes, they identify this exact package in different formats. The form printed on the packaging and shown on DailyMed is the one the FDA registered. Insurance claims use a fixed 11-digit 5-4-2 format, so the short segment is padded with a leading zero and the dashes are dropped. The Identity section at the top of this page lists each form of this code.
Is this package still being marketed?
Yes, per the latest FDA NDC Directory data on this page: this package is listed as actively marketed, with no marketing end date reported by HF Acquisition Co LLC, DBA HealthFirst. Listing status can change — the directory data on this page refreshes weekly.
Who lists this product with the FDA?
HF Acquisition Co LLC, DBA HealthFirst is the labeler of record for this NDC — the company under whose FDA-assigned code the package is listed. The labeler may be the manufacturer itself or a distributor marketing the product under its own code.
Do I need a prescription for this product?
This NDC is listed with FDA as an over-the-counter product, so it does not require a prescription. Follow the package directions, and ask your pharmacist if you are unsure whether it is right for you.
This page identifies an FDA-listed package (the NDC) and reports public regulatory and pricing data about the listing. It is reference information, not a medical recommendation — talk to your pharmacist or prescriber about your own medication.
Where does this data come from?
Listing facts (marketing category, packager status, marketing dates) from the FDA openFDA NDC Directory; label availability from DailyMed; pricing coverage from CMS NADAC; equivalence scope from the FDA Orange Book.
← 51662-1641-01 · HF 51662-1643-03 · HF →
For educational and professional reference only — not medical advice. Pricing reflects published NADAC and CMS ASP (free public data) and may differ from your acquisition cost; always verify before billing or dispensing.