Robaxin at a glance
Robaxin is a centrally acting skeletal muscle relaxant aimed at short term relief of muscle spasms and the pain that often follows sprains, strains, and acute musculoskeletal injuries. For best outcomes, it is usually combined with rest and physical therapy rather than used alone. If you feel unusually drowsy while taking it, review the guidance in Precautions and avoid driving until you know how it affects you.
Active ingredient
Active ingredient of Robaxin: Methocarbamol.
Common tablet strengths in the U.S.: 500 mg and 750 mg.
What it is used for
Therapeutic area: muscle relaxants. It is intended to ease the discomfort and muscle tightness that accompanies acute musculoskeletal conditions. It does not directly treat nerve pain or chronic spasticity disorders.
How to take
Oral administration with or without food or milk is acceptable. Taking doses with a snack can reduce stomach upset.
Adults: regimens vary by prescriber and formulation. An example regimen with 500 mg tablets is 2 tablets taken four times daily for a short period, then reduced based on response. Some patients respond to lower amounts, such as 1 tablet three times daily. Do not exceed the maximum daily dose directed by your clinician, and do not self-adjust without advice.
Children: not recommended unless a pediatric specialist advises otherwise.
Always follow your own clinician's instructions; the information here is for general education only.
Precautions
Use caution if you have kidney or liver impairment. Robaxin can cause sedation, dizziness, blurred vision, and impaired coordination. Until you know your response, avoid driving a car, operating machinery, or doing tasks requiring full alertness. Because methocarbamol depresses the central nervous system, combining it with alcohol or other sedatives can amplify these effects; see Drug interactions.
Who should not use
Do not take methocarbamol if you have known hypersensitivity to methocarbamol or any product component. The following conditions also warrant avoidance or specialist oversight:
- Myasthenia gravis, especially if treated with anticholinesterase agents
- Severe brain injury or a history of seizure disorders not well controlled
- Coma or pre-coma states of any cause
If any of the above apply, consult your clinician for alternatives in Similar or alternative medications.
Possible side effects
Seek emergency help if you notice signs of a serious allergic reaction such as hives, trouble breathing, or swelling of the face, lips, tongue, or throat.
Stop the medicine and contact a clinician urgently for: very slow heartbeat, fainting, yellowing of skin or eyes, severe confusion, spinning sensation, pronounced loss of balance, or seizures.
More common effects can include: drowsiness, dizziness, headache, nausea or vomiting, flushed or warm skin sensations, fever, memory or concentration difficulties, blurred vision, nasal congestion, insomnia, mild rash or itching. Report persistent or bothersome symptoms to your health care provider.
If a new rash develops, review Precautions and contact a professional.
Drug interactions
Methocarbamol may reduce the effect of pyridostigmine bromide; people with myasthenia gravis should only use it with extreme caution and close supervision.
Additive sedation can occur with alcohol, opioids, benzodiazepines, sedating antihistamines, sleep aids, barbiturates, and other CNS depressants. Combining such agents increases the risk of falls, respiratory depression, and impaired driving. Always tell your prescriber about all prescription, OTC, and herbal products you use.
Overdose
An overdose can be dangerous or fatal. Potential signs include profound sleepiness, nausea, impaired or blurred vision, fainting, severely slowed breathing, or seizures. Call emergency services or poison control right away if an overdose is suspected.
Missed dose
If you miss a dose, take it when you remember unless it is close to the time of your next scheduled dose. If it is nearly time for the next dose, skip the missed one. Do not double up to catch up.
Storage
Keep tablets at controlled room temperature, ideally 20 to 25 C (68 to 77 F), protected from excessive moisture and heat. Store out of reach of children and pets.
Similar or alternative medications
Depending on your condition and medical history, clinicians may consider these alternatives. Selection often balances efficacy, sedation, comorbidities, and risk of interactions.
- Tizanidine: alpha-2 agonist muscle relaxant that can cause low blood pressure and sedation.
- Baclofen: GABA-B agonist more often used for spasticity; can cause weakness and dizziness.
- Diazepam: benzodiazepine with muscle relaxant effects; Schedule IV controlled substance; higher dependence and sedation risk.
- Cyclobenzaprine: tricyclic-like muscle relaxant; can be sedating and anticholinergic.
- Carisoprodol: centrally acting relaxant; Schedule IV in the U.S. due to abuse/dependence potential; usually avoided when safer options exist.
Non-drug options that complement therapy include physical therapy, heat or ice, stretching, and activity modification. For pain, OTC analgesics such as acetaminophen or NSAIDs (ibuprofen, naproxen) may be considered if appropriate and not contraindicated.
Typical prices in the USA
Approximate retail prices vary widely by pharmacy, state, and discount programs. The following rough ranges are in USD and refer to generics unless noted:
- Methocarbamol 500 mg, 60 tablets: about 8 to 25 USD with common discounts; brand Robaxin may exceed 120 to 300 USD for similar quantities.
- Methocarbamol 750 mg, 30 tablets: about 6 to 20 USD with discounts; brand higher.
- Cyclobenzaprine 10 mg, 30 tablets: roughly 4 to 15 USD.
- Tizanidine 4 mg, 30 tablets: roughly 5 to 25 USD.
- Baclofen 10 mg, 30 tablets: about 6 to 20 USD.
- Carisoprodol 350 mg, 30 tablets: often 15 to 60 USD; availability is more restricted.
- Diazepam 5 mg, 30 tablets: commonly 3 to 20 USD, but dispensing is tightly controlled.
Prices are estimates for educational comparison only. Your out-of-pocket cost depends on your pharmacy, coupons, and insurance formularies.
Legal notes for the USA
Prescription status: Methocarbamol is prescription-only in the United States. It is not a federally scheduled controlled substance, but it still requires a valid prescription from a licensed prescriber. Dispensing without a prescription is prohibited under federal and state law.
Related medicines: Carisoprodol and diazepam are Schedule IV controlled substances under the Controlled Substances Act; they carry additional prescribing and dispensing restrictions. Remote prescribing of controlled substances is subject to the Ryan Haight Act and related federal and state telemedicine rules.
Driving and machinery: Most states prohibit operating a vehicle while impaired by any drug. If Robaxin causes sedation or dizziness, you can be cited for DUI. See Precautions.
Online pharmacies: Use only licensed U.S. pharmacies. Look for NABP accreditation or .pharmacy domains. Personal importation of prescription drugs from abroad is generally prohibited, with limited exceptions that rarely apply.
Age and use: There is no federal minimum age for lawful use with a valid prescription, but minors typically require parental or guardian consent. Always follow state-specific regulations and prescriber guidance.
Important disclaimer
This page provides general information and does not include every direction, warning, interaction, or precaution. It must not be used for self-diagnosis or to replace advice from your own clinician. Treatment, dosing, and suitability depend on your specific medical history. Always consult your health care provider for individualized instructions. The authors are not responsible for any harm from use or misuse of this information.
