Generic Name: Robaxin Brand Name(s): Generics only. No brands available.


What is Robaxin® (methocarbamol) used for?

Robaxin® is a muscle relaxant. It works by blocking nerve impulses (or pain sensations) that are sent to your brain.

Robaxin® is used together with rest and physical therapy to treat skeletal muscle conditions such as pain or injury.

Robaxin® may also be used for purposes not listed in this medication guide.

How should I take Robaxin® (methocarbamol)?

Take Robaxin® exactly as prescribed by your doctor. Do not take in larger or smaller amounts or for longer than recommended.

You may need to reduce your Robaxin® dose after the first 2 or 3 days of treatment. Follow your doctor’s instructions regarding the number of tablets you take each day.

Robaxin® can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using this medicine.

Robaxin® is only part of a complete program of treatment that may also include rest, physical therapy, or other pain relief measures. Follow your doctor’s instructions.

How do I store Robaxin® (methocarbamol)?

Robaxin® is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store Robaxin® in the bathroom or the freezer. There may be different brands of Robaxin® that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.

You should not flush Robaxin® down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Precautions & warnings

What should I know before using Robaxin® (methocarbamol)?

Before using this drug, tell your doctor if:

  • You are pregnant or breastfeeding. This is because, while you are expecting or feeding a baby, you should only take medicines on the recommendation of a doctor.
  • You are taking any other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
  • You have allergy with any of active or inactive ingredients of Robaxin® or other medications.
  • You have any other illnesses, disorders, or medical conditions.
  • You have myasthenia gravis.

Is it safe during pregnancy or breastfeeding?

There are no adequate studies in women for determining risk when using Robaxin® during pregnancy or while breastfeeding. Please always consult with your doctor to weigh the potential benefits and risks before taking Robaxin®. Robaxin® is pregnancy risk category C, according to the US Food and Drug Administration (FDA).

FDA pregnancy risk category reference below:

  • A=No risk
  • B=No risk in some studies
  • C=There may be some risk
  • D=Positive evidence of risk
  • X=Contraindicated
  • N=Unknown

Side effects

What side effects can occur from Robaxin® (methocarbamol)?

Get emergency medical help if you have any of these signs of an allergic reaction to Robaxin®: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using Robaxin® and call your doctor at once if you have a serious side effect such as:

  • Fever, chills, flu symptoms
  • Slow heart rate
  • Feeling like you might pass out
  • Seizure (convulsions)
  • Jaundice (yellowing of your skin or eyes)

Less serious side effects may include:

  • Dizziness, spinning sensation, drowsiness
  • Headache, confusion, memory problems, loss of balance or coordination
  • Nausea, vomiting, upset stomach
  • Flushing (warmth, redness, or tingly feeling)
  • Blurred vision, double vision, eye redness
  • Sleep problems (insomnia)
  • Stuffy nose
  • Mild itching or rash

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.


What drugs may interact with Robaxin® (methocarbamol)?

Robaxin® may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Product that may interact with this drug is pyridostigmine (Mestinon).

Does food or alcohol interact with Robaxin®(methocarbamol)?

Robaxin® may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with Robaxin®(methocarbamol)?

Robaxin® may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.


The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using Robaxin®(methocarbamol).

What is the dose of Robaxin®(methocarbamol) for an adult?

For Intravenous and Intramuscular Use Only.

Total adult dosage should not exceed 30 mL (3 vials) a day for more than 3 consecutive days except in the treatment of tetanus. If the condition persists, a like course may be repeated after a drug-free interval of 48 hours. Dosage and frequency of injection should be based on the severity of the condition being treated and therapeutic response noted.

For the relief of symptoms of moderate degree, one dose of 1 gram (one 10 mL vial) may be adequate. Ordinarily this injection need not be repeated, as the administration of the oral form will usually sustain the relief initiated by the injection. For the severest cases or in postoperative conditions in which oral administration is not feasible, additional doses of 1 gram may be repeated every 8 hours up to a maximum of 3 g/day for no more than 3 consecutive days.

Tablets use:

Robaxin® 500 mg

  • Initial dosage: 3 tablets q.i.d.
  • Maintenance dosage: 2 tablets q.i.d.

Robaxin® 750 mg

  • Initial dosage: 2 tablets q.i.d.
  • Maintenance dosage: 1 tablet q.4h. or 2 tablets t.i.d.

Six grams a day are recommended for the first 48 to 72 hours of treatment. (For severe conditions 8 grams a day may be administered). Thereafter, the dosage can usually be reduced to approximately 4 grams a day.

What is the dose of Robaxin®(methocarbamol) for a child?

The dosage has not been established in pediatric patients. It may be unsafe for your child. It is always important to fully understand the safety of the drug before using. Please consult with your doctor or pharmacist for more information.

How is Robaxin®(methocarbamol) available?

Robaxin® is available in the following dosage forms and strengths:

  • Injection: methocarbamol 100mg in 1Ml
  • Tablet, film coated: methocarbamol 500mg, 750mg

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of Robaxin®, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.

Hello Health Group does not provide medical advice, diagnosis or treatment.

Review Date: July 26, 2017 | Last Modified: August 4, 2017