Most of the population didn’t know the basic knowledge of medicine. The reason behind this can vary as people are not that bothered to gain such information because of their priorities and other things. A little basic knowledge of medicines you are consuming will be very helpful and able to make life healthy.

Robaxin is a brand name of the generic medication methocarbamol. Methocarbamol is a central nervous system depressant used to treat involuntary muscle spasms.

Robaxin is sometimes used in the treatment of tetanus. Robaxin belongs to a class of drugs called Skeletal Muscle Relaxants. Robaxin is used with rest and physical therapy to treat skeletal muscle conditions such as pain or injury.

How Long Does Robaxin Take Time To Work?

It is passed and absorbed in the gastrointestinal tract and distributed in body tissues. The peak plasma concentration of Robaxin takes about 2 hours and the effect can be felt about 30 minutes from the administration. This duration also depends upon your renal, gastrointestinal health as well as other medical conditions.

Half Life Of Robaxin

The plasma clearance of Robaxin ranges between 0.20 and 0.80 L/h/kg. The mean plasma excretion half-life ranges between 1 and 2 hours and the plasma protein binding ranges between 46% and 50%.

Robaxin is metabolized through dealkylation and hydroxylation. Essentially all changed and unchanged Robaxin metabolites are eliminated in the urine (See, S. and Ginzburg, R., 2008).

Factors That Influence Robaxin Stay in The System

Robaxin has a relatively short half-life. In healthy individuals, nearly all Robaxin metabolites are excreted in the urine within four hours of ingesting the drug.

The metabolism of Robaxin in the body is influenced by patients’ age and the health of their kidneys and liver. Elderly people in the age range of 69 years take a slightly longer time to eliminate Robaxin in the urine.

In other words, methocarbamol has a shorter half-life in elderly persons. Patients in the age range of 69 years take 1.5 hours to excrete Robaxin, while patients in the age range of 53 years take 1.1 hours to get rid of the drug.

The medicine should be taken as directed by the doctor, but you can purchase Robaxin online from a certified online pharmacy. Also, it is found that older patients display a decreased fraction of bound Robaxin in the blood, which means that the younger patients utilize the drug more effectively.

Patients with kidney problems and are on hemodialysis utilize Robaxin less efficiently and eliminate only 40 percent compared to healthy patients; those who eliminate 46 to 50 percent. Patients with liver cirrhosis due to alcohol misuse have similar efficacy, with only 40 to 45 percent of Robaxin binding to plasma protein.

It is found that only 2 percent of Robaxin will remain in the blood for 24 hours following the final dose in most individuals.

How Long Robaxin Stays In Urine, Hair And Blood?

A considerable amount of Robaxin metabolites may be found in one or two hours of ingestion. Robaxin remains in the urine for up to four hours, from the time of ingestion. However, the range of presence varies depending on the age and health condition of the patient.

These ranges depend on the age and health of the patient. In most of the patients, only 2 percent of absorbed Robaxin will remain in the blood for 24 hours, while it could be tested via hair within 90 days, following the final dose.

How Long Robaxin Takes To Respond?

Robaxin starts working in about 30 minutes and its full effects are seen within 2 hours. It is relatively short-acting and needs to be taken three or four times a day, as prescribed by a doctor.
Possible Side effects Of Robaxin
Robaxin may cause serious side effects, that includes:

  • Headache
  • Slow heartbeats
  • Fever
  • Chills
  • Flu symptoms
  • Seizure (convulsions)
  • Yellowing of your skin or eyes (jaundice)

These are not all the possible side effects of Robaxin, but there may be many more side effects that may not be severe. But for any side effects, you must consult your doctor.

Who Should Avoid Robaxin?

Robaxin is a prescription medicine and is not available over-the-counter. It could only be taken in consultation with a general practitioner. Patients under several conditions should avoid taking Robaxin, which are;

  • Pregnant women should avoid taking Robaxin due to an increased likelihood of the infant being born with a physical abnormality.
  • Robaxin should be avoided by lactating mothers, too, as it is found in the milk of the mother receiving treatment with the drug. But it is not clear whether it affects the infant adversely or not.
  • It should be avoided by elders also as it may increase the risk of falls. It is also not suitable for those who have an allergic reaction to Robaxin.

Sedation caused by Robaxin may affect driving or operating heavy machinery of a person. An alcoholic person should also avoid taking this medicine.
Patients already on medication of opioids, benzodiazepines, and sedating antihistamines should avoid taking Robaxin.

  • Safety and effectiveness in children below 16 years of age are still to be established.
  • People who have a history of narcotic abuse and addiction are more likely to abuse Robaxin and become psychologically addicted (See, S. and Ginzburg, R., 2008).


Knowledge about medicines can help you take a wise and healthy decision. Information like the active ingredient, brand, dosage, how to consume and ;lastly how much it take time to eliminate form the system. Just as you just read about the Robaxin. Don't forget to ask question to your medical expert.


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