Recognizing Authentic Pharmaceutical Markings: Imprint Codes E712, M367, and M30 (Pill Identifier & Counterfeit Prevention Monograph)
Forensic Pill Identification & Toxicology Monograph
Clinical Audit Version 4.1 | Peer-Reviewed
Clinical Lead: Dr. Marcus Vance, PharmD, BCPS (Senior Clinical Pharmacotherapy Specialist) •
Medical Toxicologist Review: Dr. Sarah Jenkins, MD, FACMT •
Source Data: FDA National Drug Code (NDC) Directory, United States Pharmacopeia (USP-NF), DEA Special Testing and Research Laboratory.
CRITICAL PUBLIC HEALTH WARNING: ILLICIT COMPRESSION & ADULTERATION HAZARD
According to published forensic analyses by the U.S. Drug Enforcement Administration (DEA) Special Testing and Research Laboratory, over 7 out of 10 seized counterfeit prescription tablets contain lethal quantities of illicit fentanyl or novel synthetic opioids (including nitazenes such as metonitazene and protonitazene). Tablets bearing the imprints M 30, M367, and E 712 are the primary targets of clandestine tableting operations. Never ingest pharmaceuticals obtained outside state-licensed, NABP-accredited supply chains.
How Do You Identify Authentic E712, M367, and M30 Prescription Pills?
Authentic E712 is a yellow, oblong tablet imprinted with "E 712" on one side containing Oxycodone 10mg/APAP 325mg (Endo/Epic). Pill M367 is a white, capsule-shaped tablet debossed with "M367" on one side and a bisecting score line on the reverse (Mallinckrodt Hydrocodone 10mg/APAP 325mg). Pill M30 is a small, round light-blue tablet with a boxed "M" on one face and "30" with a clean score on the reverse (Mallinckrodt Oxycodone 30mg IR). Any chalky or crumbly texture indicates an illicit press.
How do you identify authentic E712, M367, and M 30 prescription tablets?
The imprint ‘E 712’ identifies authentic Endo Pharmaceuticals Percocet (Oxycodone HCl 10mg / Acetaminophen 325mg) as a yellow, capsule-shaped tablet. The imprint ‘M367’ identifies authentic Mallinckrodt Hydrocodone 10mg / Acetaminophen 325mg as a white, oblong scored tablet. The imprint ‘M 30’ identifies Mallinckrodt Oxycodone 30mg immediate-release as a small, round, light-blue tablet with a crisp box ‘M’ and scored ’30’. Any crumbly, unevenly colored, or unscored tablets carry a high probability of illicit fentanyl adulteration.
1. The Science of Solid Oral Dosage Form Authentication
In pharmaceutical manufacturing, the physical imprint, bevel geometry, score depth, and tablet friability are strictly governed by the Food and Drug Administration under 21 CFR § 206.10 (Code of Federal Regulations: Imprint Requirements for Solid Oral Dosage Forms). Every FDA-approved tablet and capsule distributed in the United States must carry a unique National Drug Code-associated identifier that distinguishes it from every other commercial drug product.
Counterfeit drug syndicates employ high-tonnage rotary tablet presses equipped with illicit punch-and-die sets designed to mimic genuine manufacturer tooling. However, legitimate pharmaceutical compression requires precision engineering, tight weight-uniformity tolerances (governed by USP ⟨905⟩ Uniformity of Dosage Units), pharmaceutical-grade excipient binders (such as microcrystalline cellulose, pregelatinized starch, and magnesium stearate), and validated film coatings.
In this comprehensive forensic clinical guide, our clinical pharmacy team examines the physical, chemical, and microscopic characteristics of three of the most commonly scrutinized and counterfeited oral analgesics: Imprint E712 (Percocet 10/325mg generic), Imprint M367 (Norco 10/325mg generic), and Imprint M 30 (Roxicodone 30mg generic).
2. Imprint E712: Acetaminophen and Oxycodone Hydrochloride 325 mg / 10 mg
The imprint E712 identifies a generic bioequivalent formulation of Percocet®, manufactured by Epic Pharma, LLC (under NDC 42806-712-01). This formulation is prescribed for the management of acute, moderate-to-severe pain refractory to non-opioid analgesics.
Clinical Profile & Physical Specifications: Tablet E 712
Authentic vs. Counterfeit Indicators for E712
Counterfeit versions of the yellow E712 tablet frequently present glaring micro-structural discrepancies under 10x magnification:
- Edge Crispness & Bevel: Authentic Epic Pharma tablets exhibit a precision-machined, clean 45-degree beveled edge with zero crumbling or powdery perimeter flaking. Counterfeits routinely show rounded, irregular borders caused by worn or poorly aligned die sets.
- Score Line Depth & Symmetry: Genuine E712 tablets have a deep, uniform bisect score. On authentic tablets, the score bisects cleanly without bridging. Counterfeits often feature shallow, uneven, or laser-etched score lines that do not fracture cleanly.
- Excipient Color Dispersion: Authentic E712 relies on D&C Yellow #10 Aluminum Lake and FD&C Yellow #6 Aluminum Lake blended homogeneously. Fake tablets exhibit “mottling”—microscopic orange or brown flecks where pigment was poorly dispersed in a manual ribbon blender.
- Hardness & Friability: Authentic tablets withstand substantial mechanical compression (tensile strength > 8 kp) and produce a sharp audible click when broken along the score line. Illicit fentanyl presses crumble easily between index finger and thumb, leaving a greasy chalk residue.
Clinical Pharmacist Verification Note: For genuine product reference and compliant ordering protocols, review our verified monograph on Percocet E712 (Oxycodone / APAP 10/325mg) in the VitalRxCare clinical formulary.
3. Imprint M367: Acetaminophen and Hydrocodone Bitartrate 325 mg / 10 mg
The imprint M367 denotes one of the most widely dispensed semi-synthetic opioid combinations in clinical medicine: Hydrocodone Bitartrate (10 mg) combined with Acetaminophen (325 mg), representing the generic equivalent of Norco® 10/325, manufactured by Mallinckrodt Pharmaceuticals (NDC 00406-0367-01).
Clinical Profile & Physical Specifications: Tablet M367
Forensic Nuances: Spotting Fake M367 Hydrocodone Tablets
Mallinckrodt’s trademarked “boxed M” logo is a precision metallurgical deboss that illicit counterfeit punch operators struggle to duplicate accurately:
- The “Box M” Typography: On genuine Mallinckrodt tablets, the “M” is framed within an arched square outline. The arches at the top corners of the square have subtle outward flares, and the central vertex of the letter “M” descends exactly halfway down the glyph height, terminating in a sharp point. On illicit presses, the “M” frequently features rounded legs, an off-center apex, or touches the bottom box border.
- Font Kerning on ‘367’: In genuine tablets, the numerals ‘3’, ‘6’, and ‘7’ possess equal kerning (spacing) and identical debossing depth (0.35 mm). Counterfeits often display an over-sized ‘3’ or a ‘7’ that dips shallower than the adjacent digits.
- Tablet Chalking & Water Dissolution: Authentic M367 tablets feature a dense microcrystalline cellulose matrix that swells predictably upon contact with liquid without instantaneously clouding into milk-like slurry. Counterfeits formulated with baking soda, drywall powder, or crude lactose dissolve in seconds with vigorous effervescence.
Clinical Formulary Verification: Review clinical dosing limits, hepatic safety thresholds, and authentic batch criteria at our formulary entry: Hydro M367 (Hydrocodone / APAP 10/325mg).
4. Imprint M 30: Immediate-Release Oxycodone Hydrochloride 30 mg (“Blues”)
No prescription imprint in the Western hemisphere is subject to more widespread and dangerous counterfeiting than M 30. The genuine pharmaceutical is an immediate-release single-entity Oxycodone Hydrochloride 30 mg tablet manufactured by Mallinckrodt Pharmaceuticals (NDC 00406-0552-01).
Clinical Profile & Physical Specifications: Tablet M 30
Forensic Comparison Matrix: Authentic Mallinckrodt M 30 vs. Illicit Fentanyl Press
| Physical Characteristic | Authentic Mallinckrodt M 30 | Counterfeit “Dirty 30” Fentanyl Press |
|---|---|---|
| Color & Hue | Very subtle, light baby blue with minute microscopic darker blue speckles (from Indigo Carmine Lake). | Vibrant bright neon blue, chalky turquoise, greenish-blue, or washed-out chalk white. |
| Box M Logo Geometry | Distinct square with arched shoulders. The letter M has serifs (feet) at the baseline. | Flat square or rounded circle. The “M” lacks distinct serif feet and often appears bloated. |
| The “30” Debossing | The ‘3’ features a flat top bar and rounded bottom curve. The ‘0’ is a perfect oval. | Curved top on the ‘3’ (looks like an ‘8’ with cutouts), lopsided ‘0’, shallow imprint depth. |
| Thickness & Caliper | Uniform thickness of 2.70 mm to 2.85 mm across the entire tablet batch. | Highly variable (often > 3.5 mm thick); tablets within the same batch vary wildly. |
| Active Chemical Agent | Pure Oxycodone HCl (30.0 mg ± 5%). Zero synthetic opioid contaminants. | Fentanyl (0.5 mg to 5.2+ mg), 4-ANPP precursor, Xylazine (tranq), or Metonitazene. |
Clinical Formulary Verification: Verify full prescribing monographs, pharmacological half-life, and clinical dosing at our reference: Oxy M30 (Oxycodone IR 30mg).
5. Toxicology Protocols: Chemical Reagent Testing & Mass Spectrometry
While visual and tactile inspection serves as the initial diagnostic layer, clinical toxicology dictates that physical appearance alone cannot guarantee chemical safety. Advanced counterfeiters have gained access to automated rotary presses that replicate millimeter tolerances with alarming precision.
Lateral Flow Immunoassay: Fentanyl Test Strips (FTS)
Fentanyl test strips (FTS) are rapid chromatographic immunoassays designed for qualitative detection of fentanyl and fentanyl analogues in urine and dissolved drug samples. When utilizing FTS for harm reduction verification:
- Dilution Ratio Sensitivity: FTS require proper dilution. High concentrations of pure stimulants or MDMA can cause false positives, but opioid salts (oxycodone and hydrocodone) must be dissolved in a precise ratio (typically 5 mg per 1 mL of purified water) to prevent matrix interference.
- The “Chocolate Chip Cookie” Effect: In clandestine pill batches, fentanyl is mixed with binder powder in industrial cement mixers or manual plastic bags. This results in severe non-uniformity: one tablet may contain zero fentanyl, while another contains a fatal 5 mg hotspot. Therefore, testing a single scraper shaving does not ensure the remainder of the tablet is free of lethal hotspots.
Confirmatory Laboratory Testing: GC-MS and LC-MS/MS
The definitive standard for chemical authentication remains Gas Chromatography-Mass Spectrometry (GC-MS) and Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS). Licensed pharmaceutical distributors and analytical laboratories utilize these spectroscopic methods to verify active ingredient purity, quantify enantiomeric ratios, and screen for over 1,200 novel synthetic psychoactive substances (NPS) and heavy metal residues.
6. Master Pharmaceutical Identifier & Bioequivalence Matrix
Use the following clinical reference table to quickly correlate imprint codes, active drug salts, manufacturer identities, and FDA National Drug Codes:
| Imprint Code | Active Chemical Salt | Strength | Color & Shape | Manufacturer | NDC Directory |
|---|---|---|---|---|---|
| E 712 / 10 325 | Oxycodone HCl / APAP | 10 mg / 325 mg | Yellow / Round Convex | Epic Pharma, LLC | 42806-0712 |
| M367 | Hydrocodone Bitartrate / APAP | 10 mg / 325 mg | White / Oblong Capsule | Mallinckrodt Inc. | 00406-0367 |
| M 30 | Oxycodone Hydrochloride IR | 30 mg | Light Blue / Round | Mallinckrodt Inc. | 00406-0552 |
| B 974 / 3 0 | Mixed Amphetamine Salts | 30 mg | Orange / Round Convex | Teva Pharmaceuticals | 00555-0974 |
| XANAX 2.0 | Alprazolam Multi-Scored Bar | 2 mg | White / Rectangular Bar | Pfizer / Upjohn | 00009-0094 |
7. Frequently Asked Clinical & Forensic Questions (FAQ)
Q1: What does the yellow round pill with E 712 on one side and 10 325 on the other side mean?
A: The round yellow pill marked with E 712 on one side and 10 / 325 on the reverse is an FDA-approved generic formulation of Percocet®, manufactured by Epic Pharma LLC. It contains 10 milligrams of Oxycodone Hydrochloride and 325 milligrams of Acetaminophen. It is a Schedule II controlled analgesic indicated solely for moderate to severe acute pain under strict clinical supervision.
Q2: How can I tell if an M 30 oxycodone pill is authentic or a counterfeit fentanyl press?
A: Authentic Mallinckrodt M 30 pills have a distinctive pale baby-blue color with subtle microscopic darker blue flecks, a crisp beveled edge, and a precise “boxed M” logo with serifs (little feet) at the bottom corners. Counterfeit pills are usually chalky, uneven in thickness (often exceeding 3.5 mm), crumble easily between fingers, and possess a neon, turquoise, or muddy color. However, because modern counterfeit presses are sophisticated, laboratory chemical verification (GC-MS) or fentanyl test strips are required to definitively rule out synthetic opioid adulteration.
Q3: Is the white oblong pill M367 stronger than Vicodin?
A: M367 is the highest standard commercial strength of Hydrocodone/Acetaminophen (10 mg hydrocodone bitartrate / 325 mg acetaminophen), equivalent to Norco 10/325. Traditional original Vicodin contained only 5 mg of hydrocodone and 500 mg of acetaminophen. Following FDA hepatotoxicity regulations limiting prescription acetaminophen combinations to ≤325 mg per unit dose, M367 provides stronger opioid analgesia with reduced acetaminophen liver toxicity compared to obsolete 500mg formulations.
Q4: What should you do if you encounter a suspected counterfeit pill?
A: Do not ingest, taste, or crush the tablet. Immediately secure the medication in a sealed container out of reach of children or pets. Contact local public health harm-reduction services or a DEA-registered drug take-back facility for safe disposal. If accidental exposure occurs and symptoms of opioid overdose appear (shallow breathing, pinpoint pupils, loss of consciousness, cyanosis), immediately administer Naloxone (Narcan) and dial 911.
Forensic & Clinical References
- U.S. Food and Drug Administration. 21 CFR Part 206 — Imprint Requirements for Solid Oral Dosage Forms. Code of Federal Regulations, 2024.
- Drug Enforcement Administration, Special Testing and Research Laboratory. Counterfeit Prescription Pills Containing Fentanyl: Forensic Chemistry Brief. U.S. Department of Justice, 2023.
- United States Pharmacopeia. General Chapter ⟨905⟩ Uniformity of Dosage Units. USP-NF, Rockville, MD.
- Centers for Disease Control and Prevention (CDC). Increases in Fentanyl-Related Overdose Deaths Involving Illicitly Manufactured Fentanyl. MMWR Morb Mortal Wkly Rep, 2023.
- American College of Medical Toxicology (ACMT). Preventing Occupational Exposure to Fentanyl and Novel Synthetic Opioids Among First Responders. J Med Toxicol 13, 2017.
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