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Below are the general guidelines for dosing methocarbamol (Robaxin). Note that these dosages may be adjusted on a case-by-case basis for individual patients. Always follow your prescribing physician’s instructions for taking methocarbamol.

The following information comes from DailyMed, an FDA label information provider.

What if I miss a dose of methocarbamol?

According to Mayo Clinic, if you miss a dose of methocarbamol, take it immediately unless you are closer to your next dosing time. Never double doses.

What if I overdose on methocarbamol?

Limited information is available on the acute toxicity of methocarbamol. Overdose of methocarbamol is frequently in conjunction with alcohol or other CNS depressants and includes the following symptoms: nausea, drowsiness, blurred vision, hypotension, seizures, and coma.

In post-marketing experience, deaths have been reported with an overdose of methocarbamol alone or in the presence of other CNS depressants, alcohol or psychotropic drugs.


Management of overdose includes symptomatic and supportive treatment. Supportive measures include maintenance of an adequate airway, monitoring urinary output and vital signs, and administration of intravenous fluids if necessary. The usefulness of hemodialysis in managing overdose is unknown.

Dosage and Administration

  • Robaxin® (methocarbamol), 500 mg – Adults:
  • Initial dosage: 3 tablets four times a day for 2 to 3 days
  • Maintenance dosage: 2 tablets four times a day
  • Robaxin®-750 (methocarbamol): 750 mg – Adults:
  • Initial dosage: 2 tablets four times a day for 2 to 3 days
  • Maintenance dosage: 1 tablet every 4 hours or 2 tablets three times a day

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 for maintenance.

Methocarbamol Dosage for Back Pain

Indications and Usage

Robaxin® and Robaxin®-750 are indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions. The mode of action of methocarbamol has not been clearly identified, but may be related to its sedative properties. Methocarbamol does not directly relax tense skeletal muscles in man.

Talk to your doctor about specific dosing amounts and instructions for treatment of back pain.

How is methocarbamol supplied?

Robaxin® (methocarbamol tablets, USP)
500-mg tablets are light orange, round, film-coated tablets engraved with ROBAXIN 500 on the unscored side and SP above the score on the other side. They are supplied as follows:

Bottles of 100          NDC 52244-429-10

Robaxin®-750 (methocarbamol tablets, USP)
750-mg tablets are orange, capsule-shaped, film-coated tablets engraved with ROBAXIN 750 on one side and SP on the other. They are supplied as follows:

Bottles of 100          NDC 52244-449-10

Store at controlled room temperature, between 20°C and 25°C (68°F and 77°F).

Dispense in tight, child-resistant container.

Disclaimer: this article does not constitute or replace medical advice. If you have an emergency or a serious medical question, please contact a medical professional or call 911 immediately. To see our full medical disclaimer, visit our Terms of Use page.

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