Metaxalone is a muscle relaxer. It's used to treat muscle pain and discomfort that's not chronic or long-lasting. This medication is thought to relieve muscle pain by relaxing your nervous system in the brain. Metaxalone is typically taken by mouth three or four times a day. It commonly causes drowsiness and dizziness as side effects. It's best to avoid drinking alcohol while you're taking metaxalone because alcohol can interact with this medication and worsen side effects.
Muscle discomfort caused by acute (not chronic) conditions when rest or physical therapy isn't enough for relief
Metaxalone is a muscle relaxant. Experts aren't exactly sure how the medication works, since it doesn't work directly on the muscles. They believe metaxalone helps relieve pain by relaxing your nervous system in the brain.
Source: DailyMed
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Incidence not known
Agitation
back, leg, or stomach pains
black, tarry stools
bleeding gums
chills
clay-colored stools
confusion
dark urine
difficulty in breathing or swallowing
dizziness
fast heartbeat
general body swelling
headache
loss of appetite
nosebleed
painful or difficult urination
pale skin
poor coordination
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
redness of the skin
restlessness
sores, ulcers, or white spots on the lips or in the mouth
stomach pain
sweating
swelling of the face, throat, or tongue
swollen glands
talking or acting with excitement you cannot control
tightness in the chest
trembling or shaking
twitching
unpleasant breath odor
unusual bleeding or bruising
unusual tiredness or weakness
vomiting
vomiting of blood
yellowing of the eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Drowsiness
irritability
stomach or bowel upset
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Starts to work quickly (within 30 minutes to an hour)
Might cause less dizziness or drowsiness than other muscle relaxers
Available as a lower-cost generic
Might need to take 3 or 4 times a day
Interacts with common antidepressants
Not a good option for people with severe kidney problems, liver problems, or certain anemias (blood problem)
You can take metaxalone with or without food. Be sure to be consistent with the way you take the medication. Keep in mind that your body might absorb more of the medication if you take it with a full meal and you might be more likely to have side effects from metaxalone like dizziness and drowsiness.
Side effects like dizziness and sleepiness are common. Metaxalone can also affect your ability to focus and concentrate. Avoid driving or performing any activity that requires a lot of attention until you know how this medication affects you.
Don't drink alcohol while you're taking metaxalone. Alcohol can make side effects worse.
Let your prescriber know if you take other medications that can make you dizzy or drowsy, such as opioids, benzodiazepines, or sleep aids. Taking these types of medications with metaxalone can raise the risk for life-threatening drowsiness or trouble breathing.
Tell your healthcare team and pharmacist about all the medications you're taking, including over-the-counter products. Metaxalone can interact with certain medications and lead to serious risks. Interactions with antidepressants can lead to a rare but life-threatening condition called serotonin syndrome.
Metaxalone can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.
Risk factors: Taking other medications that can affect the serotonin levels in your brain
There have been reports of serotonin syndrome in some people who take metaxalone alone or with certain other medications. Serotonin syndrome is a rare, but potentially life-threatening condition that happens when there's too much serotonin in the brain. Serotonin is one of the chemicals in your brain responsible for your mood.
Your risk for serotonin syndrome goes up if you use metaxalone with other medications that affect serotonin levels, such as antidepressants, triptans for migraines, and St. John's wort. Tell your healthcare team and pharmacist about all the medications and over-the-counter products you take so they can check for any interactions with metaxalone.
Call your healthcare team or get medical help right away if you have any symptoms of having too much serotonin. These symptoms include a fast heart rate, sweating, muscle stiffness or spasms, fever, and confusion.
Risk factors: Taking with alcohol or illicit substances | Taking other medications that cause drowsiness | People over 65 | Taking metaxalone with a full meal
Taking metaxalone can make you feel sleepy. The medication can also affect your concentration and focus. These side effects are more likely to happen or be more intense if you're over 65 or if you take metaxalone with a full meal.
Don't drink alcohol while you're taking metaxalone to lessen the risk for intense side effects. Avoid activities that require you to be alert, like driving or operating machinery, until you know how the medication affects you.
Risk factors: History of liver problems | History of kidney problems
Metaxalone might not be the safest choice for people who have liver or kidney problems. The medication is processed in the body by the liver and kidneys. Metaxalone can buildup in the body if either of these organs isn't working properly. This can raise the risk for dangerous side effects, like serotonin syndrome.
Adults and children 13 years of age and older: The typical dose is 800 mg by mouth three to four times a day.
Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Severe kidney problems
Severe liver problems
History of anemia(s)
Muscle discomfort caused by acute (not chronic) conditions when rest or physical therapy isn't enough for relief
Muscle discomfort caused by acute (not long-term) conditions
Muscle pain and discomfort caused by acute (short-term) conditions
Muscle problems due to tetanus - injection form only
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Amneal Pharmaceuticals LLC. (2023). Metaxalone tablet [package insert]. DailyMed.
Bishop-Freeman, S. C., et al. (2015). Postmortem metaxalone (Skelaxin®) data from North Carolina. Journal of Analytical Toxicology.
Harden, R. N., et al. (2000). A review of three commonly prescribed skeletal muscle relaxants. Journal of Back and Musculoskeletal Rehabilitation.
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