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Central nervous system drugs

Methocarbamol

Also known as Robaxin, Metocarbamol, Miolaxene

CAS 532-03-6Formula C11H15NO5Molar mass 241.24 g/molEC 208-524-3
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard 111 suppliers listed Drug substance
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Methocarbamol chemical structure, C11H15NO5, CAS 532-03-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystals from benzene
Melting point
92 to 94
Solubility
In water, 7.20 × 10⁺³ mg/L at 25 °C
HS code
292429
Category
Central nervous system drugs
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Methocarbamol?

Plain description, key identifiers and synonyms

2-hydroxy-3-(2-methoxyphenoxy)propyl carbamate is a carbamate ester that is glycerol in which one of the primary alcohol groups has been converted to its 2-methoxyphenyl ether while the other has been converted to the corresponding carbamate ester. It is a carbamate ester, an aromatic ether and a secondary alcohol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
[2-hydroxy-3-(2-methoxyphenoxy)propyl] carbamate
CAS number
532-03-6 CAS number cross-checkedOther or deprecated CAS: 145841-69-6, 3967-43-9
EC numbers
208-524-3, 927-845-6
Molecular formula
C11H15NO5
UNII
125OD7737X
MDL number
MFCD00057662
InChIKey
GNXFOGHNGIVQEH-UHFFFAOYSA-N
InChI
InChI=1S/C11H15NO5/c1-15-9-4-2-3-5-10(9)16-6-8(13)7-17-11(12)14/h2-5,8,13H,6-7H2,1H3,(H2,12,14)
SMILES (canonical and isomeric)
COC1=CC=CC=C1OCC(COC(=O)N)O

Synonyms

  • Robaxin
  • Metocarbamol
  • Miolaxene
  • Relestrid
  • Surquetil
  • Tresortil
  • Delaxin
  • Etroflex
  • Miorilas
  • Avetil
  • Miowas
  • 2-Hydroxy-3-(2-methoxyphenoxy)propyl carbamate
  • Metocarbamolo
  • Metofenina
  • Myolaxene
  • Reflexyn
  • Romethocarb
  • Robinax
  • Forbaxin
  • Guaiphenesin carbamate
  • Guaiacol glyceryl ether carbamate
  • Guaiphenesine carbamate
  • Glycerylguaiacolate carbamate
  • AHR 85
  • Methocarbamolum
Show all 39 synonyms
  • 1,2-Propanediol, 3-(2-methoxyphenoxy)-, 1-carbamate
  • Guiacol-gliceriletere monocarbammato
  • 3-(o-Methoxyphenoxy)-2-hydroxypropyl carbamate
  • Robaxin-750
  • 3-(2-Methoxyphenoxy)-1-glyceryl carbamate
  • 2-Hydroxy-3-(o-methoxyphenoxy)propyl 1-carbamate
  • 3-(o-Methoxyphenoxy)-1,2-propanediol 1-carbamate
  • 1,2-Propanediol, 3-(o-methoxyphenoxy)-, 1-carbamate
  • Carbamate, Guaiphenesin
  • Miolaxin
  • Tanlor
  • Robaxin-V Tablets
  • Methocarbamol Tablets
  • Methcarbamol

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Crystals from benzeneexp.
Melting point
92 to 94exp.
Solubility
In water, 7.20 × 10⁺³ mg/L at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
241.24 g/molcalc.
Exact mass
241.095 Dacalc.
LogP (octanol/water)
0.53calc.
Topological polar surface area
91.01 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
6calc.
Heavy atoms
17calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.36calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H302Harmful if swallowed.
  • H317May cause an allergic skin reaction.
  • H334May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Precautionary statements (19)
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P342 + P316If experiencing respiratory symptoms: Get emergency medical help immediately.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403Store in a well-ventilated place.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Methocarbamol suppliers

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All 111 suppliers
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Where suppliers are based

111 suppliers in 21 countries

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Methocarbamol price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

In dogs, cats, and horses methocarbamol is indicated as adjunct therapy of acute inflammatory and traumatic conditions of skeletal muscle and to reduce muscle spasms.

Control muscular spasticity resulting from tetanus.

For use as an adjunct to rest, physical therapy, and other measures for the relief of discomforts associated with acute, painful musculoskeletal conditions.

Therapeutic category: Muscle relaxant (skeletal).

Use classes: Animal Drugs.

Industries and functions

Pharmacological actions

  • Muscle Relaxants, Central

Pharmacology

Methocarbamol is a Muscle Relaxant. The physiologic effect of methocarbamol is by means of Centrally-mediated Muscle Relaxation.

How it is made

Prepn from 3-(o-methoxyphenoxy)-2-hydroxypropyl chlorocarbonate: Murphey, US patent 2,770,649 (1956 to AH Robins).

Production: guaifenesin and phosgene and ammonia (phosgenation/dehydrochlorination)

Prepared by reaction of 3-(2-methoxyphenoxy)-1,2-propanediol with phosgene and ammonium hydroxide.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Methocarbamol (INN), Ref no: 205, Annex ref: II/205
  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Methocarbamol is traded under.

HS 2924.29Indicative HS code

Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other

World exports in 2024
$5.69B
−5.1% vs 2023, imports $5.8B
2019 to 2024
Top exporters
  1. China32.3%
  2. Switzerland * partner reported13.6%
  3. Norway * partner reported12.8%
Top importers
  1. United States15.9%
  2. Ireland15.8%
  3. Germany11.9%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Methocarbamol is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Methocarbamol, based on the data on this page

What is Methocarbamol?

2-hydroxy-3-(2-methoxyphenoxy)propyl carbamate is a carbamate ester that is glycerol in which one of the primary alcohol groups has been converted to its 2-methoxyphenyl ether while the other has been converted to the corresponding carbamate ester. It is a carbamate ester, an aromatic ether and a secondary alcohol.

What is the CAS number of Methocarbamol?

The CAS registry number of Methocarbamol is 532-03-6. Other or deprecated CAS numbers: 145841-69-6, 3967-43-9.

What is the molecular formula and weight of Methocarbamol?

The molecular formula of Methocarbamol is C11H15NO5 and its molar mass is 241.24 g/mol.

What is Methocarbamol used for?

In dogs, cats, and horses methocarbamol is indicated as adjunct therapy of acute inflammatory and traumatic conditions of skeletal muscle and to reduce muscle spasms. Control muscular spasticity resulting from tetanus.

Is Methocarbamol hazardous?

Methocarbamol carries the GHS signal word "Danger". Main hazards: harmful if swallowed, may cause an allergic skin reaction, may cause allergy or asthma symptoms or breathing difficulties if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Methocarbamol?

Methocarbamol is usually classified under HS code 292429 (Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Methocarbamol?

CompoundList lists 111 suppliers of Methocarbamol in United States, China, India, United Kingdom and 17 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Methocarbamol in India?

14 suppliers in India list Methocarbamol on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Methocarbamol?

Suppliers quote Methocarbamol on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Methocarbamol

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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