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
Methocarbamol
Treats muscle pain and spasms
Centrally-acting skeletal muscle relaxant, anti-spasmodic agent
Injectable
Intravenous or intramuscular injection
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.
Injectable
100 mg/mL
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.
Robaxin
500mg tablet
Robaxin
10ml of 1000mg/10ml vial
A healthcare professional administers Robaxin in a clinical or hospital setting.
More information on how to take generic methocarbamol tablets can be found here.
Robaxin is administered by healthcare providers who will manage the dosing schedule and any missed doses.
Information about methocarbamol missed doses can be found here.
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.
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:
Kidney disease
Liver disease
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 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:
Drugs that make people sleepy, especially opioids, sedatives, barbiturates, or benzodiazepines
Do not drink alcohol or use cannabis products when taking methocarbamol.
Find more information about methocarbamol interactions to avoid here.
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
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.
Methocarbamol, StatPearls
Robaxin drug summary, Prescriber’s Digital Reference (PDR)
Robaxin methocarbamol injection prescribing information, DailyMed (NIH National Library of Medicine)
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