Methocarbamol lquid, molecular formula C11H15NO5, molecular weight 241.24000, CAS 532-03-6, It is a white powder chemical with no odor or slight specific odor, melting point of 95-97 ℃, soluble in water (1:40) at 20 ℃, slightly soluble in chloroform, soluble in ethanol when heated, insoluble in n-hexane and phenol, stored in a closed container. As a muscle relaxant, it is mainly used in clinical practice to treat joint and muscle sprains, lumbar muscle strain, sciatica and other diseases. Its mechanism of action involves multiple aspects, including muscle relaxation, analgesia, anti-inflammatory, improvement of cerebral circulation, and central inhibition. These mechanisms of action make methocarbamol widely applicable in the treatment of various diseases.
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Chemical Formula |
C11H15NO5 |
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Exact Mass |
241.10 |
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Molecular Weight |
241.24 |
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m/z |
241.10 (100.0%), 242.10 (11.9%), 243.10 (1.0%) |
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Elemental Analysis |
C, 54.77; H, 6.27; N, 5.81; O, 33.16 |
Methocarbamol liquid, also known as Shujinling or methoxyaminoester, is a medication with multiple medical uses.
Treatment of musculoskeletal system diseases
1. Joint muscle sprain
As a muscle relaxant, Mesopotamia has a significant effect on treating joint and muscle sprains. Sprains often lead to muscle tension and pain, and Mesopotamia can relax tense muscles, alleviate pain, and promote recovery of the twisted area. It achieves muscle relaxation by inhibiting synaptic reflexes associated with skeletal muscle spasms, thereby aiding in the treatment of sprains.
2. Lumbar muscle strain
Lumbar muscle strain is a common lower back disease, mainly characterized by lower back muscle pain, stiffness, and restricted movement. Through its muscle relaxation effect, Mesopotamia can alleviate muscle tension and pain caused by lumbar muscle strain, and improve patients' lumbar mobility. At the same time, it also has anti-inflammatory effects, which can reduce the inflammatory response in the waist and further promote recovery.
3. Sciatica
Sciatica is a pain caused by compression or injury of the sciatic nerve, typically manifested as pain in the buttocks, posterior thigh, and lateral calf. Mesopamil can alleviate muscle tension and pain caused by sciatica, by reducing nerve root compression and inflammatory response through its analgesic and anti-inflammatory effects, thereby improving patients' symptoms.
Treatment of inflammatory diseases
1. Arthritis
Arthritis is a joint inflammatory disease characterized by joint pain, swelling, and stiffness. Mesopomo, through its anti-inflammatory effects, can alleviate the inflammatory response caused by arthritis, relieve pain and swelling. At the same time, it can also improve joint mobility and enhance patients' quality of life.
2. Rheumatism
Rheumatism is a systemic disease that mainly affects tissues such as joints, muscles, and bones. Metoclopramide also has significant effects in the treatment of rheumatism. It can alleviate joint pain and swelling caused by rheumatism by suppressing inflammatory reactions. In addition, Mesopotamia can improve patients' muscle tension and increase joint mobility.
Adjuvant therapeutic effect
1. Auxiliary physical therapy
In the process of physical therapy, metoclopramide can be used as an adjuvant drug. It can relax tense muscles, alleviate pain, make it easier for patients to receive physical therapy, and accelerate the recovery process. At the same time, Mesopotamia can improve joint mobility and enhance the effectiveness of physical therapy.
2. Recovery after surgery
After surgery, patients often need to go through a period of rehabilitation. Metoclopramide can be used as an adjuvant medication during the recovery period after surgery. It can alleviate pain and swelling at the surgical site, promote wound healing and tissue repair. At the same time, Mesopotamia can improve patients' muscle tension, increase joint mobility, and help patients recover their daily life and work abilities faster.
Treatment of inflammatory diseases
1. Insomnia
Insomnia is a common sleep disorder characterized by difficulty falling asleep, shallow sleep, or early awakening. Methocarbamol Liquid has a certain therapeutic effect in treating insomnia. It can make it easier for patients to fall asleep and maintain a deep sleep state by suppressing excessive excitation of the central nervous system. However, it should be noted that metoclopramide is not a medication specifically designed to treat insomnia, and its efficacy may vary from person to person. When using, adjustments should be made according to the patient's specific condition and the doctor's advice.
2. Headache
Headache is a common neurological symptom that can be caused by various reasons. Metoclopramide has a certain therapeutic effect in treating headaches. It can alleviate headache symptoms by inhibiting the pain transmission process in the central nervous system. At the same time, Mesopotamia also has a sedative effect, which helps alleviate patients' tension and anxiety, further improving headache symptoms.
3. Dizziness
Dizziness is a symptom of feeling oneself or the surrounding environment rotating or moving. Metoclopramide has a certain auxiliary effect in the treatment of dizziness. It can alleviate dizziness symptoms by suppressing excessive excitation of the vestibular system. In addition, Mesopotamia can improve patients' sleep quality and help alleviate anxiety and unease caused by dizziness.
Methocarbamol Liquid is a central nervous system inhibitory drug with various pharmacological effects, including muscle relaxation, analgesia, anti-inflammatory, and improvement of cerebral circulation.
1. Muscle relaxation effect
Mesopomo has a significant muscle relaxation effect, mainly achieved through its influence on neurotransmitter transmission in the central nervous system. Mesopomo can lower the sensory threshold of muscle spindles to stretch reflex, inhibiting the excitation contraction coupling process and leading to muscle relaxation. This mechanism of action makes Mesopotamia significantly effective in treating joint and muscle sprains, lumbar muscle strain, sciatica, and other conditions.
Metoclopramide also has a certain analgesic effect. Its analgesic effect is mainly achieved by affecting opioid receptors and gamma aminobutyric acid type A receptors in the central nervous system. Mesopomo can stimulate opioid receptors, thereby enhancing analgesic effects. At the same time, it can also increase the activity of gamma aminobutyric acid type A receptors, leading to enhanced central inhibitory effects and further reducing pain. This dual mechanism of action makes Mesopotamia widely applicable in the treatment of mild to moderate postoperative pain, acute pain, and chronic pain.
Metoclopramide also has anti-inflammatory effects, mainly achieved by inhibiting cyclooxygenase in the metabolism of arachidonic acid. Cyclooxygenase is one of the key enzymes involved in arachidonic acid metabolism, catalyzing the conversion of arachidonic acid into inflammatory mediators such as prostaglandins. Metoclopramide can inhibit the activity of cyclooxygenase, thereby reducing the synthesis of prostaglandin E2 and F2 α, and thus lowering the inflammatory response. This anti-inflammatory effect makes metoclopramide significantly effective in treating inflammatory diseases such as rheumatoid arthritis and rheumatoid arthritis.
4. Improve cerebral circulation function
Mesopomo can also improve cerebral blood circulation, mainly by promoting cerebral vasodilation and increasing cerebral blood flow. Mesopomo can dilate peripheral blood vessels, reducing cerebral vascular resistance and increasing cerebral blood flow. At the same time, it can also promote the repair and regeneration of cerebral vascular endothelial cells, further improving cerebral blood circulation. This mechanism of action makes Mexbamot effective in treating symptoms such as dizziness and tinnitus caused by hypoxia.
Mesopomo also has a central inhibitory effect, which is mainly achieved by selectively inhibiting the functional activity of the cerebral cortex. The inhibitory effect on the central nervous system makes Mesopotamia significantly effective in treating insomnia, anxiety, and other neurological disorders. At the same time, it can also alleviate headache symptoms and improve the quality of sleep for patients.
Methocarbamol liquid dosage forms consist of two stages: chemical synthesis of methocarbamol active pharmaceutical ingredient (API), followed by formulation into oral solution or injection using solvents, cosolvents and stabilisers. The liquid formulation itself does not alter the core synthetic route of the API.
Dominant API Synthetic Route
The industrially established route starts from guaifenesin, which is converted via cyclic carbonate intermediate formation followed by ammonolysis to yield the target carbamate product.
Guaifenesin may be prepared by base-catalysed etherification of guaiacol with epichlorohydrin and purified before entering the next step. Under base and DMAP catalysis, guaifenesin undergoes selective transesterification with dimethyl carbonate or diethyl carbonate to form a cyclic carbonate intermediate.
Under mild temperature conditions, this intermediate undergoes ring-opening ammonolysis with aqueous ammonia, selectively forming the carbamate at the primary hydroxyl position to give crude methocarbamol.
The traditional phosgene route has been gradually replaced by the carbonate method due to toxicity and waste-treatment concerns. The carbonate route features mild conditions and safe operation, making it more suitable for large-scale manufacturing.
Crude Product Purification and Quality Control
Crude methocarbamol is recrystallised from water or alcohol–water mixtures to remove the β-isomer, unreacted diol and carbonate-related impurities. HPLC is used to monitor purity and related substances, while residual solvents and heavy metals are controlled within specification. Methocarbamol is a white crystalline powder with limited water solubility; therefore liquid formulations cannot be prepared by simple dissolution in water and require tailored formulation strategies.
Key Formulation Considerations for Liquid Dosage Forms
Methocarbamol liquid is not simply an aqueous solution of the API. Polyols, cosolvents and buffered systems are typically employed to improve solubility and stability. Oral solutions commonly use sorbitol, propylene glycol and glycerin as solubilising carriers, plus flavouring agents, preservatives and pH buffer salts.
Injection-grade solutions require additional control over sterility, pyrogens and antioxidants to avoid degradation caused by prolonged high-temperature sterilisation.
During preparation, the API is first mixed and dispersed with cosolvents, then buffered aqueous solution is added gradually. After pH adjustment, the solution is filtered for sterilisation. Strong alkalis and strong oxidising agents must be avoided throughout processing to prevent carbamate hydrolysis.
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FAQ
What is methocarbamol best used for?
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Methocarbamol is used to treat muscle spasms/pain. It is usually used along with rest, physical therapy, and other treatment. It works by helping to relax the muscles.
What is the downside of methocarbamol?
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General side effects of methocarbamol can include tachycardia (rapid heart rate), bradycardia (slow heart rate), dizziness, blurred vision, nausea, headache, confusion, drowsiness, clumsiness, constipation, memory problems and flushed/itchy skin.
Is methocarbamol an opioid?
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Once the brain develops tolerance and physical dependence, the person experiences uncomfortable withdrawal symptoms if they stop taking the drug. Methocarbamol is not an opioid, nor is it a painkiller. It has a completely different effect on the body, relaxing the central nervous system.
Is methocarbamol the same as diazepam?
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Methocarbamol is not a controlled substance and is less likely to cause drowsiness compared to other muscle relaxers. In contrast, diazepam is a Schedule IV controlled substance due to its risk of misuse and dependence.
What drugs should you not mix with methocarbamol?
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For example, methocarbamol can interact with opioids like hydrocodone and benzodiazepines like alprazolam (Xanax). It can also interact with sleep medications like zolpidem (Ambien) and diphenhydramine (Zzzquil). Other methocarbamol interactions include alcohol, gabapentin (Neurontin), and zolpidem (Ambien).
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