What is Robaxin: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Robaxin is the brand-name version of methocarbamol, a prescription muscle relaxant that relieves muscle pain. Robaxin is only sold as an injection, but most people will take tablets. Robaxin tablets are no longer sold in the U.S., so doctors can only prescribe generic methocarbamol tablets. More information about generic methocarbamol tablets can be found here. This article focuses on Robaxin injections.

Robaxin overview

BRAND NAMES:

  • Robaxin

Generic Names:

  • Methocarbamol

Uses:

  • Treats muscle pain and spasms

Therapeutic Classes:

  • Centrally-acting skeletal muscle relaxant, anti-spasmodic agent

Forms:

  • Injectable

How it’s taken:

  • Intravenous or intramuscular injection

What is Robaxin used for?

Robaxin is a prescription injection administered by a healthcare professional to treat muscle pain due to muscle spasms. Doctors use it in addition to physical therapy and rest.

What form(s) does Robaxin come in

  • Injectable

    • 100 mg/mL

What are common Robaxin doses?

  • For relief of moderate symptoms: one gram single intravenous or intramuscular injection

  • For relief of severe symptoms or postoperative pain: one gram intravenous or intramuscular injection given every eight hours for a maximum of three days

Find additional information about methocarbamol tablet dosages here.

Common Robaxin prescriptions

  • Robaxin
    500mg tablet

  • Robaxin
    10ml of 1000mg/10ml vial

How to take Robaxin

What to do if you miss a dose of Robaxin

Robaxin contraindications

  • This medicine is not right for everyone. 

  • Healthcare professionals will not use it in anyone who has had an allergic reaction to methocarbamol or any of the ingredients in the injection.

Robaxin warnings

  • If Robaxin injections are followed by methocarbamol tablets, make sure any doctor or healthcare provider treating you knows that you are taking methocarbamol.

  • Before the doctor gives a Robaxin injection, make sure the doctor knows if you are pregnant or breastfeeding.

  • The doctor should also know if you have:

  • Robaxin injections could cause serious problems including:

    • Seizures

    • Jaundice

    • Kidney injury

    • Liver injury

    • Phlebitis

    • Nervous system abnormalities like amnesia, confusion, or vision changes

  • Methocarbamol may make you dizzy or drowsy. Do not drive or do anything that could be dangerous after an injection.

Robaxin interactions

  • Robaxin has some major drug interactions, so the doctor prescribing Robaxin should have a thorough list of all the prescription drugs, over-the-counter medications, and supplements being used, including:

  • Do not drink alcohol or use cannabis products when taking methocarbamol.

Find more information about methocarbamol interactions to avoid here.

Robaxin side effects

Serious side effects

Talk to a doctor if you notice any signs or symptoms of a possible serious side effect, including:

  • Seizures

  • Slow heartbeat

  • Dark urine or pale stools, nausea, vomiting, loss of appetite, stomach pain, yellow skin or eyes

  • Dizziness, fainting, falling

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

Less serious side effects

  • Pain, redness, swelling, or peeling skin at the injection site

  • Drowsiness

  • Dizziness

  • Headache

  • Mild loss of coordination

  • Confusion

  • Trouble sleeping

  • Warmth or redness in your face, neck, arms, or upper chest

  • Urine discoloration

Find more information about methocarbamol side effects here.

Sources:

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