Methocarbamol is a CNS depressant indicated with rest, physical therapy and other treatments to control the discomfort associated with various acute musculoskeletal conditions.
- Brand Names
- Robaxacet, Robaxacet-8, Robaxin, Robaxisal, Spasmhalt-8
- Generic Name
- DrugBank Accession Number
Methocarbamol tablets and intramuscular injections are prescription medicines indicated in the United States as an adjunct to rest, physical therapy, and other measures for the relief of discomforts associated with acute, painful musculoskeletal conditions.Label,9 In Canada, methocarbamol can be sold as an over the counter oral medicine at a lower dose that may be combined with acetaminophen or ibuprofen.10 A combination product with acetylsalicylic acid and codeine is available in Canada by prescription.10
Methocarbamol was FDA approved on 16 July 1957.8
- Small Molecule
- Approved, Vet approved
- Average: 241.2405
- Chemical Formula
- (RS)-2-hydroxy-3-(2-methoxyphenoxy)propyl carbamate
Methocarbamol tablets and intramuscular injections are indicated in the United States as an adjunct to rest, physical therapy, and other measures for the relief of discomforts associated with acute, painful musculoskeletal conditions.Label,9 Oral methocarbamol in America may be given up to 1500mg 4 times daily for 2-3 days.3
In Canada, methocarbamol containing oral formulations are sold over the counter for pain associated with muscle spasm.10 However, if these combination formulations include codeine, they are prescription only.10Reduce drug development failure ratesBuild, train, & validate machine-learning modelswith evidence-based and structured datasets.Build, train, & validate predictive machine-learning models with structured datasets.
- Associated Conditions
- Contraindications & Blackbox Warnings
- Avoid life-threatening adverse drug eventsImprove clinical decision support with information on contraindications & blackbox warnings, population restrictions, harmful risks, & more.Avoid life-threatening adverse drug events & improve clinical decision support.
Methacarbamol is a skeletal muscle relaxant with an unknown mechanism of action.5 Methacarbamol has been shown to block spinal polysynaptic reflexes, decrease nerve transmission in spinal and supraspinal polysynaptic pathways, and prolong the refractory period of muscle cells.5,4 Methocarbamol does not act as a local anesthetic upon injection.4 In animal studies, methocarbamol also prevents convulsions after electric shock.5
- Mechanism of action
The mechanism of action of methocarbamol is thought to be dependant on its central nervous system depressant activity.3 This action may be mediated through blocking spinal polysynaptic reflexes, decreasing nerve transmission in spinal and supraspinal polysynaptic pathways, and prolonging the refractory period of muscle cells.5,4 Methocarbamol has been found to have no effect on contraction of muscle fibres, motor end plates, or nerve fibres.9
Target Actions Organism NCarbonic anhydrase 1inhibitor Humans
The time to maximum concentration is 1.1 hours for both healthy patients and those on hemodialysis.1 The maximum plasma concentration is 21.3mg/L for healthy patients and 28.7mg/L in hemodialysis patients.1 The area under the curve for healthy patients is 52.5mg/L*hr and 87.1mg/L*hr in hemodialysis patients.1 AUC% based on terminal elimination half life is 2% for healthy patients and 4% for hemodialysis patients.1
Older studies report maximum plasma concentrations in 0.5 hours.2
- Volume of distribution
Volume of distribution data in humans is scarce. In horses, the volume of distribution is 515-942mL/kg at steady state or 724-1130mL/kg.5
- Protein binding
Methocarbamol is 46-50% protein bound in healthy patients and 47.3-48.9% protein bound in hemodialysis patients.1
Methocarbamol is metabolized in the liver by demethylation to 3-(2-hydroxyphenoxy)-1,2-propanediol-1-carbamate or hydroxylation to 3-(4-hydroxy-2-methoxyphenoxy)-1,2-propanediol-1-carbamate.2 Methocarbamol and its metabolites are conjugated through glucuronidation or sulfation.2
Hover over products below to view reaction partners
- Route of elimination
In humans the majority of the dose is eliminated in the urine.2 In dogs, 88.85% of the dose is eliminated in urine and 2.14% in the feces.2 In rats, 84.5-92.5% of the dose is eliminated in the urine and 0-13.3% is eliminated in the feces.2
- Adverse Effects
- Improve decision support & research outcomesWith structured adverse effects data, including: blackbox warnings, adverse reactions, warning & precautions, & incidence rates.Improve decision support & research outcomes with our structured adverse effects data.
Overdose of methocarbamol may be associated with alcohol and other central nervous system depressants.Label Patients may experience nausea, drowsiness, blurred vision, hypotension, seizures, and coma.Label Treatment of overdose is generally through airway maintenance, monitoring urinary output, vital signs, and giving fluid intravenously if necessary.Label
The oral LD50 in rats is 3576.2mg/kg.10
The FDA has classified methocarbamol as pregnancy category C.Label Animal and human studies have not been performed to determine the risks to a fetus, however fetal and congenital abnormalities have been reported.Label Methocarbamol is excreted in the milk of dogs, however it is unknown if this is also the case for humans.Label Caution should be exercised when taking methocarbamol while breastfeeding.Label
Studies to assess the carcinogenicity, mutagenicity, or effects on fertility of methocarbamol have not been performed.Label
- Not Available
- Pharmacogenomic Effects/ADRs
- Not Available
- Drug Interactions
- This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
Drug Interaction 1,2-Benzodiazepine The risk or severity of adverse effects can be increased when Methocarbamol is combined with 1,2-Benzodiazepine. Acetazolamide The risk or severity of adverse effects can be increased when Methocarbamol is combined with Acetazolamide. Acetophenazine The risk or severity of adverse effects can be increased when Methocarbamol is combined with Acetophenazine. Aclidinium Methocarbamol may increase the central nervous system depressant (CNS depressant) activities of Aclidinium. Agomelatine The risk or severity of adverse effects can be increased when Methocarbamol is combined with Agomelatine. Alfentanil The risk or severity of adverse effects can be increased when Methocarbamol is combined with Alfentanil. Alimemazine The risk or severity of adverse effects can be increased when Methocarbamol is combined with Alimemazine. Almotriptan The risk or severity of adverse effects can be increased when Methocarbamol is combined with Almotriptan. Alosetron The risk or severity of adverse effects can be increased when Methocarbamol is combined with Alosetron. Alprazolam The risk or severity of adverse effects can be increased when Alprazolam is combined with Methocarbamol.Identify potential medication risksEasily compare up to 40 drugs with our drug interaction checker.Get severity rating, description, and management advice.Learn more
- Food Interactions
- Avoid alcohol.
- Take with or without food. The absorption is unaffected by food.
- Drug product information from 10+ global regionsOur datasets provide approved product information including:dosage, form, labeller, route of administration, and marketing period.Access drug product information from over 10 global regions.
- Product Images
- International/Other Brands
- Bolaxin (Ying Yuan) / Carbaflex (Paill) / Delaxin / DoloVisan (Dr.Kade Pharmaceutische Fabrik) / Fubaxin (Grape King) / Lumirelax (Juvise) / Metocarbamol (AZ Pharma) / Mioflex (Labinco) / Miorel (Cheminter) / Musxan (Pharmasant) / Ortoton (Recordati) / Rebamol (Winston) / Robaxin-750 (Pfizer) / Robinax (Khandelwal) / Sinaxar (Armofar) / Taspan (Honten)
- Brand Name Prescription Products
Name Dosage Strength Route Labeller Marketing Start Marketing End Region Image Methocarb 500-EZS Kit 500 mg/1 Oral PureTek Corporation 2018-10-23 Not applicable Methocarbamol Tablet 750 mg/1 Oral Vintage Pharmaceuticals, LLC 2007-09-13 2007-09-13 Methocarbamol Tablet 750 mg/1 Oral Lannett Company, Inc. 2007-06-19 Not applicable Methocarbamol Tablet 500 mg/1 Oral Vintage Pharmaceuticals, LLC 2007-09-13 2007-09-13 Methocarbamol Tablet 500 mg/1 Oral Lannett Company, Inc. 2007-06-19 Not applicable Methocarbamol Inj 100mg/ml Liquid 100 mg / mL Intramuscular; Intravenous Univet Pharmaceuticals Ltd. 1988-12-31 Not applicable Methocarbamol Omega Liquid 100 mg / mL Intramuscular; Intravenous Omega Laboratories Ltd 2003-07-28 Not applicable Robaximol Inj 100mg/ml Liquid 100 mg / mL Intramuscular; Intravenous Montreal Veterinary Products Inc. 1989-12-31 2021-06-14 Robaxin Tablet, film coated 750 mg/1 Oral Pd Rx Pharmaceuticals, Inc. 2003-01-20 2016-12-15 Robaxin Injection 100 mg/1mL Intramuscular; Intravenous West-Ward Pharmaceuticals Corp. 2017-10-17 Not applicable
- Generic Prescription Products
- Over the Counter Products
Name Dosage Strength Route Labeller Marketing Start Marketing End Region Image Robaxin Tablet 500 mg Oral Glaxosmithkline Inc 1958-12-31 Not applicable Robaxin 750 Tablet 750 mg Oral Glaxosmithkline Inc 1993-12-31 Not applicable
- Mixture Products
Name Ingredients Dosage Route Labeller Marketing Start Marketing End Region Image A.S.A. With Methocarbamol Night-time Extra Strength Methocarbamol (400 mg) + Acetylsalicylic acid (500 mg) Tablet Oral Cellchem Pharmaceuticals Inc. Not applicable Not applicable Acetaminophen 325mg + Methocarbamol 400mg Caplets Methocarbamol (400 mg) + Acetaminophen (325 mg) Tablet Oral Marcan Pharmaceuticals Inc Not applicable Not applicable Acetaminophen 500mg + Methocarbamol 400mg Extra Strength Caplets Methocarbamol (400 mg) + Acetaminophen (500 mg) Tablet Oral Marcan Pharmaceuticals Inc Not applicable Not applicable Advil Back Pain Methocarbamol (500 mg) + Ibuprofen (200 mg) Tablet Oral Glaxosmithkline Consumer Healthcare Ulc Not applicable Not applicable Analgesic and Muscle Relaxant Methocarbamol (500 mg) + Ibuprofen (400 mg) Tablet Oral Pharmascience Inc 2012-03-20 Not applicable Analgesic and Muscle Relaxant Caplets Methocarbamol (500 mg) + Ibuprofen (200 mg) Tablet Oral TEVA Canada Limited 2009-11-18 2021-08-12 Aspirin Backache Methocarbamol (400 mg) + Acetylsalicylic acid (325 mg) Tablet Oral Bayer Not applicable Not applicable Aspirin Night-time Methocarbamol (400 mg) + Acetylsalicylic acid (500 mg) Tablet Oral Bayer Inc Consumer Care 2006-05-24 2010-08-05 Axacet-C1/8 Methocarbamol (400 mg) + Acetaminophen (325 mg) + Codeine phosphate (8 mg) Tablet Oral Technilab Pharma Inc. Not applicable Not applicable Axisal-C1/8 Methocarbamol (400 mg) + Acetylsalicylic acid (325 mg) + Codeine phosphate (8 mg) Tablet Oral Technilab Pharma Inc. Not applicable Not applicable
- Unapproved/Other Products
Name Ingredients Dosage Route Labeller Marketing Start Marketing End Region Image Methocarb 500-EZS Methocarbamol (500 mg/1) Kit Oral PureTek Corporation 2018-10-23 Not applicable
- ATC Codes
- M03BA73 — Methocarbamol, combinations with psycholeptics
- M03BA — Carbamic acid esters
- M03B — MUSCLE RELAXANTS, CENTRALLY ACTING AGENTS
- M03 — MUSCLE RELAXANTS
- M — MUSCULO-SKELETAL SYSTEM
- M03BA — Carbamic acid esters
- M03B — MUSCLE RELAXANTS, CENTRALLY ACTING AGENTS
- M03 — MUSCLE RELAXANTS
- M — MUSCULO-SKELETAL SYSTEM
- Drug Categories
- Acids, Acyclic
- Benzene Derivatives
- Carbamic Acid Esters
- Central Nervous System Agents
- Central Nervous System Depressants
- Centrally-mediated Muscle Relaxation
- Methyl Ethers
- Muscle Relaxants
- Muscle Relaxants, Centrally Acting Agents
- Musculo-Skeletal System
- Peripheral Nervous System Agents
- Phenyl Ethers
- Chemical TaxonomyProvided by Classyfire
- This compound belongs to the class of organic compounds known as anisoles. These are organic compounds containing a methoxybenzene or a derivative thereof.
- Organic compounds
- Super Class
- Phenol ethers
- Sub Class
- Direct Parent
- Alternative Parents
- Phenoxy compounds / Methoxybenzenes / Alkyl aryl ethers / Carbamate esters / Secondary alcohols / Organic carbonic acids and derivatives / Organopnictogen compounds / Organonitrogen compounds / Organic oxides / Hydrocarbon derivatives / Carbonyl compounds show 1 more
- Alcohol / Alkyl aryl ether / Anisole / Aromatic homomonocyclic compound / Carbamic acid ester / Carbonic acid derivative / Carbonyl group / Ether / Hydrocarbon derivative / Methoxybenzene / Monocyclic benzene moiety / Organic nitrogen compound / Organic oxide / Organic oxygen compound / Organonitrogen compound / Organooxygen compound / Organopnictogen compound / Phenoxy compound / Secondary alcohol show 9 more
- Molecular Framework
- Aromatic homomonocyclic compounds
- External Descriptors
- carbamate ester, aromatic ether, secondary alcohol (CHEBI:77498)
- Affected organisms
- Humans and other mammals
- CAS number
- InChI Key
- IUPAC Name
- 2-hydroxy-3-(2-methoxyphenoxy)propyl carbamate
- General References
- Sica DA, Comstock TJ, Davis J, Manning L, Powell R, Melikian A, Wright G: Pharmacokinetics and protein binding of methocarbamol in renal insufficiency and normals. Eur J Clin Pharmacol. 1990;39(2):193-4. [Article]
- Bruce RB, Turnbull LB, Newman JH: Metabolism of methocarbamol in the rat, dog, and human. J Pharm Sci. 1971 Jan;60(1):104-6. [Article]
- Witenko C, Moorman-Li R, Motycka C, Duane K, Hincapie-Castillo J, Leonard P, Valaer C: Considerations for the appropriate use of skeletal muscle relaxants for the management of acute low back pain. P T. 2014 Jun;39(6):427-35. [Article]
- Crankshaw DP, Raper C: Mephenesin, methocarbamol, chlordiazepoxide and diazepam: actions on spinal reflexes and ventral root potentials. Br J Pharmacol. 1970 Jan;38(1):148-56. doi: 10.1111/j.1476-5381.1970.tb10343.x. [Article]
- Muir WW 3rd, Sams RA, Ashcraft S: The pharmacology and pharmacokinetics of high-dose methocarbamol in horses. Equine Vet J Suppl. 1992 Feb;(11):41-4. [Article]
- Authors unspecified: Methocarbamol-A New Lissive Agent. Can Med Assoc J. 1958 Dec 15;79(12):1008-9. [Article]
- O'DOHERTY DS, SHIELDS CD: Methocarbamol; new agent in treatment of neurological and neuromuscular diseases. J Am Med Assoc. 1958 May 10;167(2):160-3. [Article]
- FDA Approved Drug Products: Robaxin [Link]
- FDA Approved Drug Products: Robaxin Intramuscular Injection [Link]
- Pfizer Canada: Robax [Link]
- FDA label
- Download (121 KB)
- Download (78.8 KB)
- Clinical Trials
Phase Status Purpose Conditions Count 4 Completed Treatment Back Pain Lower Back 1 4 Completed Treatment Rib Fractures / Wounds and Injuries 1 3 Completed Treatment Pain 1 3 Recruiting Treatment Cirrhosis of the Liver 1
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- A-S Medication Solutions LLC
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- C.O. Truxton Inc.
- Cardinal Health
- Caremark LLC
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- Direct Dispensing Inc.
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- Dispensing Solutions
- Diversified Healthcare Services Inc.
- Group Health Cooperative
- H and H Laboratories
- H.J. Harkins Co. Inc.
- Heartland Repack Services LLC
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- Dosage Forms
Form Route Strength Tablet, film coated Oral Tablet, coated Oral Kit Oral 500 mg/1 Injection Intramuscular; Intravenous 100 mg/1mL Injection Parenteral 100 mg/1mL Injection, solution Intramuscular; Intravenous 1000 mg/10mL Tablet Oral 500 mg/1 Tablet Oral 750 mg/1 Tablet, coated Oral 500 mg/1 Tablet, coated Oral 750 mg/1 Solution Intramuscular; Intravenous 0.1 g Solution Parenteral 500 mg Tablet, film coated Oral 200 mg Tablet, delayed release Oral 750 mg Tablet Oral 750 mg Solution Intramuscular; Intravenous 1 g Tablet, coated Oral 750 mg Tablet Oral Tablet, film coated Oral 750 mg Tablet, coated Oral 325 mg Injection, solution Intramuscular; Intravenous 100 mg/1mL Tablet, film coated Oral 500 mg/1 Tablet, film coated Oral 750 mg/1 Solution Parenteral 1 g Liquid Intramuscular; Intravenous 100 mg / mL Tablet Oral 350 mg Tablet Oral 500 mg
Unit description Cost Unit Robaxin-750 750 mg tablet 2.48USD tablet Robaxin 100 mg/ml vial 2.2USD ml Robaxin-750 tablet 1.99USD tablet Robaxin 500 mg tablet 1.68USD tablet Methocarbamol powder 0.95USD g Methocarbamol 750 mg tablet 0.49USD tablet Methocarbamol 500 mg tablet 0.38USD tabletDrugBank does not sell nor buy drugs. Pricing information is supplied for informational purposes only.
- Not Available
- Experimental Properties
Property Value Source melting point (°C) 92 MSDS water solubility 2.5g/100mL MSDS logP 0.61 CHEM INSPECT TEST INST (1992)
- Predicted Properties
Property Value Source Water Solubility 4.21 mg/mL ALOGPS logP 0.63 ALOGPS logP 0.45 ChemAxon logS -1.8 ALOGPS pKa (Strongest Acidic) 13.6 ChemAxon pKa (Strongest Basic) -3.4 ChemAxon Physiological Charge 0 ChemAxon Hydrogen Acceptor Count 4 ChemAxon Hydrogen Donor Count 2 ChemAxon Polar Surface Area 91.01 Å2 ChemAxon Rotatable Bond Count 7 ChemAxon Refractivity 59.07 m3·mol-1 ChemAxon Polarizability 24.28 Å3 ChemAxon Number of Rings 1 ChemAxon Bioavailability 1 ChemAxon Rule of Five Yes ChemAxon Ghose Filter Yes ChemAxon Veber's Rule No ChemAxon MDDR-like Rule No ChemAxon
- Predicted ADMET Features
Property Value Probability Human Intestinal Absorption + 0.9638 Blood Brain Barrier + 0.5747 Caco-2 permeable - 0.6689 P-glycoprotein substrate Non-substrate 0.6452 P-glycoprotein inhibitor I Non-inhibitor 0.9411 P-glycoprotein inhibitor II Non-inhibitor 0.8887 Renal organic cation transporter Non-inhibitor 0.9105 CYP450 2C9 substrate Non-substrate 0.8431 CYP450 2D6 substrate Non-substrate 0.7658 CYP450 3A4 substrate Non-substrate 0.606 CYP450 1A2 substrate Inhibitor 0.9107 CYP450 2C9 inhibitor Non-inhibitor 0.9302 CYP450 2D6 inhibitor Non-inhibitor 0.9231 CYP450 2C19 inhibitor Non-inhibitor 0.9066 CYP450 3A4 inhibitor Non-inhibitor 0.9338 CYP450 inhibitory promiscuity Low CYP Inhibitory Promiscuity 0.9542 Ames test Non AMES toxic 0.5776 Carcinogenicity Non-carcinogens 0.9406 Biodegradation Not ready biodegradable 0.8358 Rat acute toxicity 2.2930 LD50, mol/kg Not applicable hERG inhibition (predictor I) Weak inhibitor 0.984 hERG inhibition (predictor II) Non-inhibitor 0.9411
- Mass Spec (NIST)
- Not Available
Spectrum Spectrum Type Splash Key Predicted GC-MS Spectrum - GC-MS Predicted GC-MS Not Available Predicted MS/MS Spectrum - 10V, Positive (Annotated) Predicted LC-MS/MS Not Available Predicted MS/MS Spectrum - 20V, Positive (Annotated) Predicted LC-MS/MS Not Available Predicted MS/MS Spectrum - 40V, Positive (Annotated) Predicted LC-MS/MS Not Available Predicted MS/MS Spectrum - 10V, Negative (Annotated) Predicted LC-MS/MS Not Available Predicted MS/MS Spectrum - 20V, Negative (Annotated) Predicted LC-MS/MS Not Available Predicted MS/MS Spectrum - 40V, Negative (Annotated) Predicted LC-MS/MS Not Available LC-MS/MS Spectrum - LC-ESI-qTof , Positive LC-MS/MS Not Available LC-MS/MS Spectrum - LC-ESI-qTof , Positive LC-MS/MS Not Available MS/MS Spectrum - , positive LC-MS/MS splash10-02t9-0900000000-97aeacf66e8410c23139 MS/MS Spectrum - , positive LC-MS/MS splash10-02t9-2900000000-df41a784aa756b8e064d
- Pharmacological action
- General Function
- Zinc ion binding
- Specific Function
- Reversible hydration of carbon dioxide. Can hydrates cyanamide to urea.
- Gene Name
- Uniprot ID
- Uniprot Name
- Carbonic anhydrase 1
- Molecular Weight
- 28870.0 Da
- Parr JS, Khalifah RG: Inhibition of carbonic anhydrases I and II by N-unsubstituted carbamate esters. J Biol Chem. 1992 Dec 15;267(35):25044-50. [Article]
Drug created on June 13, 2005 13:24 / Updated on October 20, 2021 19:48