Methocarbamol Dosage: How Much Of Robaxin Can Be Taken Daily?

Last Updated: January 29, 2020

Methocarbamol, also known as Robaxin, is a prescription medication that is combined with rest, physical therapy and other measures to help the user to relax the muscles and relieve any pain or discomfort that may be occurring as a result of muscle injuries, sprains or strains. However, just like with any other drug, Methocarbamol dosage has a safe limit for each disease and age group. Following the recommended dose of Methocarbamol is imperative to avoid Robaxin overdose. Read further to find safe Methocarbamol dosage for back pain and other conditions treated with Robaxin.

Methocarbamol Dosage For Adult Patients

Methocarbamol drug class falls under the skeletal muscle relaxant group. This means that Robaxin works on the central nervous system rather than relaxing the muscles directly, unlike some other muscle relaxants.
Pill box and a glass of water

The drug is supplied in Methocarbamol 500 mg and 750 mg tablets, and there is also an intravenous form of Methocarbamol which is supplied in 1 ml solutions of 100 mg strength.
To serve as a treatment alongside muscle rest, physical therapy, or other relief measures for pain associated with musculoskeletal conditions, the dosage schedule for Methocarbamol is as follows:

Method of Administration Initial Dose Schedule Maximum Dose (within the first 48-72 hours) Maximum Dose (after the first 72 hours) Maintenance Dose Maximum Maintenance Dose
Oral 1,500mg 4 times/day for two to three days 8 grams/day (for severe conditions) 1,000mg (four times a day); 1,500mg (three times a day) or Robaxin 750mg (every four hours) 4 grams per day (in divided doses) 4.5 grams per day (in divided doses)
Intravenous 1 gram (IM or IV) Single-dose 1 gram (every 8 hours for one day) 3 grams per day (IM or IV) only after a drug-free 48 hours
Initial Dose Rate Additional Dose (if necessary) Total Maximum Daily Dose
1 to 2 grams IV 300mg per minute 1 to 2 grams IV (total should not exceed 3 grams) 24 grams per day

For this intravenous method of Methocarbamol administration for adults, the dosages are expected to be repeated every six hours until the patient can have a nasogastric tube inserted for oral therapy. When this is done, saline solutions or crushed Robaxin tablets suspended in water can then be administered through the tube.

Methocarbamol Dosage For Pediatric Patients

Methocarbamol may be recommended for pediatric patients in the treatment of tetanus. The method of Methocarbamol administration will be intravenous, and it is important to point out that the safety of administering this method for other conditions in pediatric patients has not been established or approved.
teenager at pediatrician's office
The dosing schedule for pediatric patients is as follows:

Initial Methocarbamol Dose Maximum Daily Dose Frequency
15 mg/kg (or 500 mg/m2) IV 1.8 grams/m2/day IV Three consecutive days

Just as is the case with treatment for adult patients, the Robaxin dosage here should be repeated every six hours if needed. It can either be administered through IV injection into the tubing at a maximum undiluted rate of 3mL per minute or by IV infusion.

What Is The Maximum Recommended Dose Of Methocarbamol?

The maximum recommended dose of Methocarbamol varies according to the age of the patient, although certain adjustments will also be made in specific situations. For instance, a patient with a medical condition that can interfere with methocarbamol treatment will have adjustments made away from the regular dosing schedule. The same applies for patients that may be using other medication that can interfere with methocarbamol treatment. Additionally, in tests that have been carried out, the oral LD50 in rats is 3576.2mg/kg.
Female doctor giving pills bottle to male patient in clinic.
In a regular situation, the maximum recommended Robaxin doses are as follows:

Robaxin Max Dose For Adults

For regular adults and geriatric patients, a maximum of 12 grams/day IV or 24 grams/day PO is recommended for tetanus treatment. For acute muscle spasm, a maximum of 8 grams/day PO or 3 grams/day IM/IV is recommended. In chronic use, the maximum Robaxin dose is 4.5 grams/day PO.

Robaxin Max Dose For Adolescents

For Adolescents over the age of 16, a maximum of 1.8 grams/m2/day IV is recommended for tetanus treatment. For acute muscle spasm, a maximum of 8 grams/day PO or 3 grams/day IM/IV is recommended for the first 48 to 72 hours. In chronic use, the maximum Methocarbamol dose is 4.5 grams/day PO.
For adolescents less than the age of 16, a maximum of 1.8 grams/m2/day IV is recommended for tetanus treatment.

Robaxin Max Dose For Children

For the treatment of tetanus, a maximum of 1.8 grams/m2/day IV. The safety and efficacy of using methocarbamol to treat children for other conditions have not been established yet.

Robaxin Max Dose For Infants

Please note that these doses may be subject to change as required from a qualified physician that has made a diagnosis due to some of the reasons mentioned above (medical condition, interactions, etc.) Additionally, any Robaxin drug test conducted within four hours after ingestion can come up positive as the drug can remain in the system for that long.

Can One Overdose On Methocarbamol?

Yes, it is possible to overdose on Robaxin. Apart from the situation where the patient takes more than the prescribed dose of the medication, other factors such as using other sedative drugs simultaneously or using the drug while using alcohol can lead to a methocarbamol overdose.
female hands hold Robaxin pills and a glass of water
Some side effects of Robaxin overdose are:

  • severe dizziness
  • sweating
  • severe drowsiness
  • difficulty breathing
  • loss of consciousness
  • seizures
  • shaking
  • blurry vision

Any user that begins to show these side effects of Robaxin overdose must be taken to the hospital immediately. Thus, it is strongly inadvisable for recreational users to try to get a Robaxin high by overdosing. Except for overdose risks, the recreational use of Robaxin can lead to drug abuse problems. If such a problem is noticed, patients should look for professional medical help in certified drug rehabilitation centers.

How To Use Robaxin Safely?

Methocarbamol is generally used as a short-term treatment, and if it is not used exactly as prescribed, there are serious risks involved. Even when the Methocarbamol dose is used in the strengths prescribed by the physician, it is still important not to miss any doses, or the medication may stop working.
doctor pediatrician talk with little girl
The drug works best when there are certain amounts of it in the system at all times while treatment lasts. Some important considerations to note for taking Robaxin safely are:

  • Methocarbamol can be taken with or without food.
  • The drug should be kept away from light and at room temperature.
  • Methocarbamol should not be stored in damp areas (like the bathroom, for instance).
  • It should be kept in a tight container.
  • Never put Robaxin in the glove compartment of a car, especially if the weather is very hot or very cold.

Page Sources

  1. U.S. National Library of Medicine - National Center for Biotechnology Information, COMPOUND SUMMARY: Methocarbamol,
  2. U.S. National Library of Medicine, Methocarbamol, August 2017,
  3. Corey Witenko, Robin Moorman-Li, Carol Motycka, Kevin Duane, Juan Hincapie-Castillo, Paul Leonard, Christopher Valaer, Considerations for the Appropriate Use of Skeletal Muscle Relaxants for the Management Of Acute Low Back Pain, June 2014,

Published on: January 29th, 2020

Updated on: January 29th, 2020


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  • Patricia
    My physician prescribed me Robaxin for the acute muscle spasms, but it does not seem to help… I kept the pills in my car, and it was quite cold outside. Could it affect the medications? Should I buy the new bottle, or they just do not work right for me?