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ZYNCOF Dextromethorphan HBr and Guaifenesin 20 mg/5mL; 400 mg/5mL Syrup, 474 mL — NDC 52083-0400-16 package photo

ZYNCOF Dextromethorphan HBr and Guaifenesin 20 mg/5mL; 400 mg/5mL Syrup, 474 mL

by Kramer Novis · 474 mL in 1 BOTTLE, PLASTIC (52083-400-16)
NDC 52083-0400-16
🏷️ FDA NDC (as labeled) 52083-400-16 billing pads the product segment with a zero
This package
Contains474 mL Pack sizes3 compare ↓
Also comes in: 30 ml 52083-0400-01 120 ml 52083-0400-04
OTC On market Non-controlled
🗂️ Data synced Sep 17, 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

🆔 Identity & classification

FDA NDC (as labeled) 52083-400-16
Product NDC 52083-400
11-digit billing NDC 52083040016
NCPDP billing unit ML — per mL (volume)
RxCUI 1113368
UNII 9D2RTI9KYH, 495W7451VQ
Application # M012
SPL Set ID cffd6d5f-0cb2-4d38-bdb0-6a21120418cc
Established class (EPC) Expectorant
Physiologic effect Decreased Respiratory Secretion Viscosity; Increased Respiratory Secretions
DEA schedule Non-controlled
Marketing category OTC MONOGRAPH DRUG
Marketing status On market
FDA listing status Listed (active directory)
Marketing start 2011-06-01
Route ORAL
Dosage form SYRUP
Substance DEXTROMETHORPHAN HYDROBROMIDE; GUAIFENESIN
GPI-14 43997002521280
GPI class Zyncof
GCN Seq No 067618
GCN 30209
HICL code 000223
Ingredient (HICL) Guaifenesin/Dextromethorphan
HIC1 code B
Therapeutic class — broad (HIC1) Respiratory System
HIC2 code B3
Therapeutic class — intermediate (HIC2) Drugs Affecting Primarily The Trachea And Bronchi
HIC3 code B3T
Therapeutic class — specific (HIC3) Non-Opioid Antitussive And Expectorant Combination
AHFS code 48:08.00.00
AHFS class Antitussives
FDB label name ZYNCOF 20-400 MG/5 ML LIQUID
FDB brand name Zyncof
Legend status O — Over-the-counter (OTC) drug or device
Why two NDCs? The FDA registers this code as 52083-400-16 — a 5-3-2 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 product segment → 52083-0400-16. 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.

🏷️ RxNorm drug class

This medicine belongs to the Uncompetitive N-methyl-D-aspartate Receptor Antagonist class.

Pharmacologic class Uncompetitive N-methyl-D-aspartate Receptor Antagonist, Sigma-1 Agonist
Drug family (ATC) Other antidepressants, Opium alkaloids and derivatives
How it works Uncompetitive NMDA Receptor Antagonists, Sigma-1 Receptor Agonists
Where does this data come from?
Therapeutic classes from RxNorm RxClass (U.S. National Library of Medicine) — Established Pharmacologic Class (FDA), ATC drug family (WHO) and mechanism of action, matched by this product’s RxCUI.

🏭 Manufacturer & labeler

LabelerKramer Novis
FDA applicationM012 (OTC MONOGRAPH DRUG)
Labeler code52083
First marketedJun 2011
Product typeHuman Otc Drug
Portfolio26 products on file
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.

🩺 Clinical

Label name ZYNCOF 20-400 MG/5 ML LIQUID Ingredient Guaifenesin/Dextromethorphan
📖 What it is MedlinePlus · NLM

Dextromethorphan is used to temporarily relieve cough caused by the common cold, the flu, or other conditions. Dextromethorphan will relieve a cough but will not treat the cause of the cough or speed recovery. Dextromethorphan is in a class of medications called antitussives. It works by decreasing activity in the part of the brain that causes coughing.

Read the full MedlinePlus article ↗
📗 Our plain-language guide HelloPharmacist
  • The two ingredients tackle your symptoms from different angles. Guaifenesin is an expectorant — it helps thin and loosen the mucus in your chest so you can cough it up more easily....
  • What exactly does this combination do — why are two ingredients needed?
  • It depends on which antidepressant you're taking. If it's a type called an MAOI — which includes certain older antidepressants and some medications for Parkinson's disease — you sh...
  • Can I take this if I'm on an antidepressant?
📖 Read our full Dextromethorphan / Guaifenesin 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.

💊 What it looks like

FlavorGrape
One label can cover several strengths, so colors may be combined — always confirm a loose pill against the dispensed prescription label or a pharmacist.
Where does this data come from?
Physical description (imprint, shape, color, scoring, coating) from this product’s FDA Structured Product Labeling (SPL), mirrored from DailyMed / openFDA.

🧪 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 2968PHW8QP
    A weak organic acid derived from citrus fruits or made through fermentation. It works as a buffer to control pH, a preservative to extend shelf life, and a flavoring agent in medications.
  • UNII 2R04ONI662
    Eucalyptus oil is a fragrant liquid extracted from eucalyptus tree leaves. It's used in medicines as a flavor, scent, or soothing agent in topical products and cough preparations.
  • UNII PDC6A3C0OX
    Glycerin is a clear, thick liquid derived from plant oils or fats. It acts as a humectant to retain moisture, a sweetener, and a solvent in medications.
  • UNII L7T10EIP3A
    A cooling compound from mint plants used as a flavoring agent and to create a fresh sensation in medicines. It helps mask bitter tastes and improve how the product feels in the mouth.
  • UNII A2I8C7HI9T
    Methylparaben is a preservative derived from benzoic acid that prevents growth of bacteria, fungi, and mold in medicines. It extends the product's shelf life and maintains safety during storage.
  • UNII 6DC9Q167V3
    Propylene glycol is a clear liquid derived from petroleum or vegetable sources. It acts as a solvent, humectant, and preservative in medicines, helping dissolve active ingredients and maintain product stability.
  • UNII Z8IX2SC1OH
    Propylparaben is a chemical preservative used to prevent bacterial and fungal growth in medicines and personal care products. It helps extend shelf life and maintain product safety during storage.
  • UNII 1Q73Q2JULR
    Sodium citrate is a salt derived from citric acid. It works as a buffer to maintain the medicine's pH level and may also help improve taste or act as a preservative in the formulation.
  • UNII 96K6UQ3ZD4
    Sucralose is a synthetic sweetener made from sugar. It's added to medicines to improve taste without adding calories, helping make bitter or unpleasant-tasting drugs easier to take.
  • 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.

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

The official label also statescitric acid, eucalyptus oil, flavors, glycerin, menthol, methylparaben, propylene glycol, propylparaben, purified water, sodium citrate, sucralose

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.

💲 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.
Try another pack size: 30 ml 120 ml
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.

🔁 Therapeutic equivalents

ProductLabelerPackNADAC/unitTEStatusPrice vs. this
Bio-Z-Cough 20 mg/5mL; 400 mg/5mL 45737-0251-16 Advanced 473 ml — — FDA listed —
Zyncof 20 mg/5mL; 400 mg/5mLthis 52083-0400-16 Kramer 474 ml — — FDA listed —
G-Zyncof 20 mg/5mL; 400 mg/5mL 52083-0600-16 Kramer 473 ml — — FDA listed —
About this product: other versions of the same ingredient, strength and form are listed above, least expensive first, with FDA equivalence ratings where available.
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

🏛️
2011
On the market since
Jun 2011
📍
2026
Currently FDA-listed
15 years listed
🔒
·
No generic listed yet
brand only
ℹ️No FDA-approved generic found

We did not find an FDA-approved generic match for this exact strength, form and route.

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.

🔬 Reported adverse events (FAERS)

Read carefully: FAERS reports are voluntary and unverified. Counts are not incidence, do not establish causation, are subject to reporting bias, and cannot be used to compare one drug to another. Shown for signal context only. Reports for ZYNCOF (this brand).

Top reported reactions

Cardiac Arrest5
Respiratory Arrest5
Intentional Drug Misuse2
Arrhythmia Supraventricular1
Arthralgia1
Completed Suicide1
Device Information Output Issue1

Reporter sex

10 reports
Male · 44%
Female · 56%

Serious outcomes

Death5
Hospitalization1
Reports over time (by year) — tap or hover for the count & year
2019 2021 2023 2026 1 0
Most recent year is provisional (FAERS lags ~3 months).
Where does this data come from?
Adverse-event reports from the FDA Adverse Event Reporting System (FAERS) via openFDA. FAERS reports are voluntary and unverified — counts are not incidence and don’t establish causation.

📦 Packaging — all sizes for this product

Package NDCDescription Marketing startStatus
52083-0400-01 30 mL in 1 BOTTLE, PLASTIC (52083-400-01) 2011-06-01 Active
52083-0400-04 120 mL in 1 BOTTLE, PLASTIC (52083-400-04) 2011-06-01 Active
52083-0400-16 You're viewing this 474 mL in 1 BOTTLE, PLASTIC (52083-400-16) 2013-01-23 Active

You're viewing the largest of 3 pack sizes for this product.

Pack size FAQ

What quantity is in NDC 52083-0400-16?
NDC 52083-0400-16 contains 474 mL — 474 ml in 1 bottle, plastic.
What is the difference between NDC 52083-0400-16 and NDC 52083-0400-01?
Both are ZYNCOF Dextromethorphan HBr and Guaifenesin 20 mg/5mL; 400 mg/5mL Syrup — the drug itself is identical. NDC 52083-0400-16 is the 474 mL package, while NDC 52083-0400-01 is the 30 ml package.
What NDC number is used to bill for this package of ZYNCOF Dextromethorphan HBr and Guaifenesin 20 mg/5mL; 400 mg/5mL Syrup?
Bill NDC 52083-0400-16 — the 11-digit billing format is 52083040016. Pharmacy and medical claims use the 11-digit form; the FDA label may print a shorter form of the same code.

🧭 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

Is this NDC FDA-approved?
An NDC listing does not by itself establish FDA approval — the NDC Directory records that a product is listed with FDA, not that it was reviewed and approved. This listing's marketing category is "Otc Monograph Drug". Products approved under an application carry an NDA, ANDA, or BLA number.
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 FDA registers it as 52083-400-16, which is what is printed on the packaging and shown on DailyMed. Insurance claims use a fixed 11-digit 5-4-2 format, so the short segment is padded with a leading zero: 52083-0400-16, written without dashes as 52083040016. The Identity section at the top of this page lists every form of this code.
What do the three segments of this NDC mean?
In 52083-0400-16, the first segment (52083) is the labeler code FDA assigned to Kramer Novis; the middle segment (0400) identifies this specific product — its ingredient, strength, and dosage form; and the last segment (16) identifies this exact package size and type. Together they name one specific package of one specific product.
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 Kramer Novis. Listing status can change — the directory data on this page refreshes weekly.
Does this product come in other package sizes?
Yes — the FDA directory lists 2 other package presentations of this same product, including 30 ml (52083-0400-01), 120 ml (52083-0400-04). Each has its own NDC and its own page — see the package list near the top of this page.
Who lists this product with the FDA?
Kramer Novis 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.

📄 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 📦 Storage and Handling 🧪 Active Ingredient 🧪 Inactive Ingredients 🎯 Purpose
🎯 Indications and Usage 31 words ▾

Uses • temporarily relieves cough due to minor throat and bronchial irritation as may occur with a cold • helps loosen phlegm (mucus) and thin bronchial secretions to drain bronchial tubes

⏱️ Dosage and Administration 42 words ▾

Directions • do not take more than 6 doses in any 24-hour period. • mL=milliliter age dose Adults and children 12 years of age and over 1 teaspoon (5 mL) every 4 hours Children under 12 years of age do not use

⚠️ Warnings 164 words ▾

Warnings • Do not use if you are now taking a prescription monoamine oxidase inhibitor (MAOI) (certain drugs for depression, psychiatric or emotional conditions, or Parkinson’s disease), or for 2 weeks after stopping the MAOI drug. If you do not know if your prescription drug contains an MAOI, ask a doctor or pharmacist before taking this product. ​Ask a doctor before use if you have • ​cough that occurs with too much phelgm (mucus) • cough that lasts or is chronic such as occurs with smoking, asthma, chronic bronchitis or emphysema. ​When using this product, do not use more than directed.

Stop use and ask a doctor if cough lasts more than 7 days, comes back, or is accompanied by fever, rash, or persistent headache. These could be signs of a serious condition. If pregnant or breast-feeding, ask a health professional before use. ​Keep out of reach of children. ​In case of overdose, get medical help or contact a Poison Control Center right away.

📦 Storage and Handling 32 words ▾

Other information • Tamper evident feature: Do not use if printed security seal is torn, broken or missing. • Store at controlled room temperature 15-30°C (59-86°F) • Avoid excessive heat or humidity.

🧪 Active Ingredient 15 words ▾

Active ingredients (in each 5 mL, 1 teaspoon) Dextromethorphan HBr, 20 mg Guaifenesin, 400 mg

🧪 Inactive Ingredients 18 words ▾

Inactive ingredients citric acid, eucalyptus oil, flavors, glycerin, menthol, methylparaben, propylene glycol, propylparaben, purified water, sodium citrate, sucralose

🎯 Purpose 4 words ▾

Purposes Cough suppressant Expectorant

Source: FDA Structured Product Labeling, mirrored from DailyMed / openFDA. Prefer the government’s original formatting? View this label on DailyMed ↗
← 52083-0242-30 · Kramer 52083-0483-90 · Kramer →
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.