Key takeaways
Methocarbamol 500 mg is one of the strengths of this generic prescription muscle relaxant.
Methocarbamol is typically recommended in doses of 1,000 mg to 1,500 mg to relieve muscle-related pain short term.
A free SingleCare coupon can bring methocarbamol 500 mg down to as little as $3 for 30 tablets at participating pharmacies.
If a muscle strain or spasm has you reaching for relief, your healthcare provider may prescribe methocarbamol. This prescription medication is used alongside rest and physical therapy to ease short-term (acute) muscle pain. Read on to learn what methocarbamol is, how it’s used, common side effects, and how much it costs.
What is methocarbamol 500 mg?
Methocarbamol 500 mg is a prescription muscle relaxant and the generic version of brand-name Robaxin. It’s available in 500 mg, 750 mg, and 1,000 mg tablets. Unlike many other pain medications, methocarbamol is not an opioid, narcotic, or controlled substance. It belongs to a class of medications called centrally acting skeletal muscle relaxants (SMRs), which work through the central nervous system (brain and spinal cord) rather than acting directly on muscle tissue.
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What is methocarbamol 500 mg used for?
Methocarbamol 500 mg is FDA approved to relieve discomfort from acute, painful musculoskeletal conditions like muscle strains, sprains, and spasms. It targets symptoms rather than the underlying cause of the pain, such as an injury, which is why it’s prescribed for short-term use only. Healthcare providers typically prescribe it for a few days to a few weeks, given the risk of side effects with longer-term use.
Patients taking methocarbamol for an injury or a strain can expect a typical course to be five to 10 days. This is done in combination with therapies such as stretching and gradually returning to regular activity, says Kiara DeWitt, registered nurse (RN), Head of Clinical Operations at Medical Director Co. In some cases, it may be prescribed off-label as well.
“Clinicians may prescribe methocarbamol for patients experiencing painful stiffness associated with neurological disorders such as multiple sclerosis, but such prescribing has limited evidence to support its effectiveness,” says Mariam Zakhary, DO, clinical adviser at Ikon Recovery Centers in Saddle Brook, New Jersey.
Methocarbamol is not intended for chronic pain management. If you’re experiencing muscle pain or spasms, speak with your healthcare provider to get an evaluation and treatment plan that’s right for you.
Methocarbamol 500 mg dosage instructions
The standard adult dose of methocarbamol for muscle spasms is 1,500 mg (three 500 mg tablets) taken four times daily for the first 48 to 72 hours of treatment, per FDA prescribing information. After that, one of the following maintenance dosing plans may be recommended:
- 1,000 mg (two 500 mg tablets) every six hours
- 1,500 mg (three 500 mg tablets) every eight hours
- One 750 mg tablet every six hours
In severe cases, healthcare providers may temporarily prescribe higher initial doses of up to 8,000 mg per day. Your healthcare provider can adjust your methocarbamol dosage based on how you respond to treatment.
How to take methocarbamol 500 mg
Methocarbamol tablets can be taken with or without food. If you miss a dose, take it as soon as you remember, unless it’s almost time for the next scheduled dose. In that case, skip the missed dose and continue your regular dosing schedule. Do not take two doses at once to make up for a missed dose. Always follow the specific instructions from your prescribing healthcare provider.
How long does it take for methocarbamol 500 mg to work?
Methocarbamol typically begins to work within about 30 minutes of taking a tablet, with peak effects within one to two hours. “Most patients can expect pain relief within 30 minutes to one hour. Peak plasma concentrations occur at about two hours after dosing,” DeWitt says. The effects of each dose generally last four to six hours, though this can vary from person to person.
Factors including age, kidney and liver function, body weight, symptom severity, and other medications can influence how the body responds to methocarbamol and how long it takes to work.
What are the side effects of methocarbamol 500 mg?
The most common side effects of methocarbamol are drowsiness, dizziness, lightheadedness, headache, upset stomach, and blurred vision. Sedation is one of the more significant side effects to be aware of. “These side effects affect about 1 in 10 patients during the first 3-5 days of starting methocarbamol,” says DeWitt. People taking this medication should avoid driving, operating heavy machinery, or performing other activities that require alertness until they know how it affects them.
Some people taking methocarbamol may also notice changes in urine color. Urine that appears dark green, brown, or black can be a harmless side effect of the medication and may not require treatment.
Less common but more serious side effects include fainting, seizures, slow heartbeat (bradycardia), confusion, and jaundice (yellowing of the skin or eyes). Signs of a severe allergic reaction include hives, swelling of the face, lips, or throat, difficulty breathing, and a weak pulse. Seek immediate medical attention if these signs occur.
Methocarbamol warnings and interactions
The most important drug interactions with methocarbamol involve other medications that depress the central nervous system (CNS). CNS depressants include opioids, benzodiazepines, barbiturates, sleeping pills, alcohol, and cannabinoid-containing products. When combined with methocarbamol, these can significantly increase sedation and raise the risk of accidents, falls, injury, or respiratory depression. Even over-the-counter antihistamines and sedating supplements like valerian can amplify methocarbamol’s sedative effects and should be avoided during treatment. Always share a complete list of your medications and supplements with your healthcare provider.
Who should not take methocarbamol 500 mg?
The medication should not be taken by anyone with a known allergy to it or its inactive ingredients. “Although methocarbamol appears to have a slightly reduced risk of causing sedation compared to some other drugs of similar classification, elderly patients appear to be at an increased risk of falling and developing cognitive confusion while using this medication,” Dr. Zakhary says.
People with liver disease, kidney disease, or a history of seizures should discuss the risks with their healthcare provider before starting methocarbamol. Per FDA prescribing information, methocarbamol should not be used by women who are pregnant or may become pregnant, particularly during early pregnancy, due to reports of fetal and congenital abnormalities. It’s not known whether methocarbamol passes into breast milk, so caution is advised for those who are breastfeeding.
Methocarbamol 500 mg vs. other muscle relaxers
Several prescription muscle relaxants are available, and healthcare providers choose between them based on the patient’s condition, medical history, and response to treatment. Here’s how methocarbamol compares to some commonly prescribed alternatives.
Methocarbamol vs. cyclobenzaprine
Both methocarbamol and cyclobenzaprine (formerly known by the brand name Flexeril) are prescription SMRs used to treat acute, painful musculoskeletal conditions such as low back pain. The two medications work differently and have different side effect profiles.
Cyclobenzaprine is related to tricyclic antidepressants (TCAs) such as nortriptyline and can cause significant drowsiness or dizziness, while methocarbamol tends to have a milder sedative effect. For this reason, clinicians may prescribe methocarbamol over cyclobenzaprine for patients at increased risk of sedation.
“Methocarbamol is frequently prescribed when patients need to avoid sedation. It causes less drowsiness than cyclobenzaprine, which has a sedation rate of 29% to 38% when administered at the recommended dose,” DeWitt says.
RELATED: Robaxin vs. Flexeril
Methocarbamol vs. tizanidine
Methocarbamol and tizanidine (brand name Zanaflex) are both prescription muscle relaxants, but they work through different mechanisms and are prescribed for different reasons. Methocarbamol treats acute muscle pain, while tizanidine is FDA approved for muscle spasticity associated with chronic neurological conditions such as multiple sclerosis, stroke, and cerebral palsy.
Both medications carry the risk of sedation, though their side effect profiles differ. “Tizanidine is effective for treating muscle spasms, particularly those caused by spasticity, but it can decrease blood pressure and necessitates close monitoring,” Dr. Zakhary says.
RELATED: Methocarbamol vs. tizanidine
How much does methocarbamol 500 mg cost?
The cost of methocarbamol 500 mg varies by pharmacy, location, insurance coverage, and whether you use a discount card. Generic methocarbamol is typically more affordable than the brand-name version, Robaxin. Without insurance, the average retail price of methocarbamol 500 mg is $27 for 30 tablets.
A free SingleCare coupon can lower the cost to as little as $3 for 30, 500 mg tablets at participating pharmacies near you. Enter your ZIP code on the SingleCare website or SingleCare app to compare prices and find savings at pharmacies near you, including Kroger, Walmart, CVS, and Costco.
Expert takeaway
“There are limited circumstances in which the benefits of methocarbamol outweigh the risks,” emphasizes Chad Shaffer, MD, a member of the SingleCare Medical Board, “so if it is used, taking time to carefully review one’s health history, medication list, and dosing instructions with the prescribing healthcare professional is critical.”
Frequently asked questions
Can you take 2 methocarbamol 500 mg at once?
Yes, but only if directed by your healthcare provider. Two 500 mg tablets taken together (1,000 mg total) every six hours is a common maintenance dose of methocarbamol for muscle spasms.
How often can you take methocarbamol 500 mg?
Methocarbamol is typically taken every four to eight hours, depending on your healthcare provider’s instructions and the phase of treatment you’re in.
Is methocarbamol 500 mg a narcotic?
No, methocarbamol is a centrally acting skeletal muscle relaxant and not a narcotic controlled substance.
The SingleCare prices in this article are the most accurate at the time of publishing in ZIP code 23666 as of Jul. 14, 2026. Prices vary by pharmacy. Visit our coupon page for updated drug prices at pharmacies near you.
- Methocarbamol, StatPearls (2024)
- Methocarbamol tablet, coated, DailyMed (2026)
- Tizanidine hydrochloride capsule, DailyMed (2025)
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