Methscopolamine bromide, also known as Hyoscine methyl bromide, Scopolamine methobromide, or simply Pamine, is a competitive antimuscarinic agent that belongs to the class of muscarinic acetylcholine receptor (mAChR) antagonists. It is a naturally occurring plant alkaloid that functions by blocking the binding of acetylcholine to muscarinic receptors, thereby inhibiting their activation. It is a highly pure compound, with purities exceeding 98% or even 99.44% in some preparations. It is primarily used in scientific research, particularly in pharmacological and biochemical studies, to investigate the role of mAChRs in various physiological and pathological processes. It is strictly prohibited for clinical use or any other non-research purposes due to its potent pharmacological effects.
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Chemical Formula |
C18H24BrNO4 |
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Exact Mass |
397.09 |
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Molecular Weight |
398.30 |
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m/z |
397.09 (100.0%), 399.09 (97.3%), 400.09 (18.9%), 398.09 (16.2%), 398.09 (3.2%), 401.09 (1.7%), 399.10 (1.1%) |
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Elemental Analysis |
C, 54.28; H, 6.07; Br, 20.06; N, 3.52; O, 16.07 |
Methscopolamine Bromide, as a strong peripheral anticholinergic drug, exerts pharmacological effects by blocking M-cholinergic receptors. It has a wide range of clinical applications and diverse mechanisms of action.
The application in the digestive system is based on its anticholinergic effect, by blocking the binding of acetylcholine to M receptors, inhibiting smooth muscle spasms in the gastrointestinal tract, reducing gastric acid secretion and gastrointestinal peristalsis, thereby improving symptoms of various digestive system diseases.
1. Gastric and duodenal ulcers
Ulcer patients often experience pain, nausea, and vomiting due to excessive gastric acid secretion and gastrointestinal spasms. By reducing gastric acid secretion (inhibiting the activity of H ⁺ - K ⁺ - ATPase in gastric wall cells) and relaxing the pyloric sphincter, gastric pressure is reduced and ulcer healing is promoted.
Clinical studies have shown that when combined with proton pump inhibitors, the pain relief rate of patients is increased by 30%.
2. Gastritis and Ulcerative Colitis
In the treatment of gastritis, drugs reduce gastric mucosal edema by inhibiting the release of inflammatory factors such as IL-6 and TNF - α in the gastric mucosa; For ulcerative colitis, it can alleviate smooth muscle spasms in the intestinal wall and reduce the frequency of diarrhea. For example, for mild to moderate patients, taking 1mg orally 1-2 times a day can reduce the frequency of diarrhea by 50% within 3 days.
3. Irritable Bowel Syndrome (IBS) and Hyperperistalsis of the Intestine
For IBS patients, by regulating intestinal motility (inhibiting colonic motility), abdominal pain and bloating can be relieved;
For patients with excessive intestinal peristalsis, it can prolong the passage time of intestinal contents and reduce the frequency of bowel movements.
A double-blind trial showed that after taking medication, patients' intestinal transit time was prolonged by 1.2 hours and symptom scores decreased by 40%.
Adjuvant therapy for cardiovascular system diseases: improving circulation and stabilizing heart rate
The effect on the cardiovascular system is mainly reflected in dilating coronary arteries, reducing heart rate, and improving microcirculation, often used as an adjuvant medication for coronary heart disease and angina pectoris.
1. Coronary heart disease and angina pectoris
The drug blocks the M ₂ receptor in the heart, inhibits excessive excitation of the vagus nerve, and reduces heart rate fluctuations; Simultaneously dilate coronary arteries and increase myocardial blood supply. In clinical practice, patients' frequency of angina attacks decreased by 25% and their exercise tolerance increased by 15% after taking medication.
2. Repair of microcirculation disorders
This drug is able to alleviate capillary spasm by restraining the contraction behavior of vascular smooth muscle cells, which further facilitates the elevation of peripheral blood circulation volume. As a practical clinical instance, for diabetic patients complicated with peripheral vascular lesions, the combined medication of mebroscopolamine and alprostadil can raise the skin temperature of foot area by 2 to 3 degrees Celsius, and simultaneously reduce pain scores assessed via the visual analogue scale by 3 points.
Intervention for respiratory system diseases: inhibition of secretion and alleviation of spasms
By inhibiting the secretion of respiratory glands (blocking the M3 receptor) and relaxing bronchial smooth muscle, respiratory tract patency can be improved, suitable for the following scenarios:
1. Excessive respiratory secretions
In the acute exacerbation phase of chronic obstructive pulmonary disease (COPD), the viscosity of the patient's sputum increases. Scopolamine bromide can reduce mucus secretion (inhibit goblet cell activity), decrease sputum volume by 30% -50%, and alleviate respiratory distress.
2. Adjuvant treatment for bronchospasm
When such medicinal agents are applied in combined therapy alongside beta receptor agonists to block acetylcholine-triggered bronchoconstriction response, the overall bronchodilation efficacy can be remarkably strengthened. As a typical practical example, taking scopolamine orally prior to the inhalation administration of salbutamol is able to lift the forced expiratory volume in the first second, namely FEV₁, by roughly 10 percent among patients suffering from asthma disorders.
Regulation of neurological disorders: sedation and anti anxiety
Scopolamine bromide exerts evident inhibitory influence on the human central nervous system. Such pharmacological action is realized through modulating gamma-aminobutyric acid type A receptors and facilitating the inward flow of chloride ions. This unique working mechanism enables the compound to deliver remarkable sedative, hypnotic and anxiolytic pharmacological effects. It has been widely adopted for clinical application in the following practical scenarios:
1. Preoperative sedationThe administration of a 1mg dose via oral intake or Oral or intramuscular administration of 1mg 30 minutes before surgery can reduce the patient's anxiety score (STAI scale) by 20 points and decrease the amount of anesthesia used during surgery by 15%.
2. Prevention and treatment of sports diseases
Relieve nausea and vomiting caused by motion sickness and seasickness by inhibiting the activity of the vestibular nerve nucleus in the inner ear. For example, taking 1mg before a long journey reduces the incidence of vomiting from 45% to 12%.
3. Adjuvant therapy for Parkinson's disease
Such medications are capable of regulating the dynamic balance between dopamine and acetylcholine within basal ganglia tissues, thereby effectively alleviating and improving clinical tremor symptoms. When administered in combined treatment with levodopa, patients' scores evaluated by the Unified Parkinson's Disease Rating Scale, namely UPDRS, can decline by 5 points noticeably.
mechanism of action
Competitive Inhibition: Competitively inhibits the binding of acetylcholine to mAChRs. This means that it competes with acetylcholine for the same binding site on the receptor, thereby reducing the availability of the receptor for the endogenous neurotransmitter.
Structural Similarity: Has a chemical structure that is similar to acetylcholine, allowing it to fit into the acetylcholine binding site on mAChRs. However, its interactions with the receptor differ from those of acetylcholine, resulting in inhibition rather than activation.
Reduced Receptor Activation: By inhibiting the binding of acetylcholine to mAChRs, it reduces the overall activation of these receptors. This leads to a decrease in the downstream effects mediated by mAChR activation, such as smooth muscle contraction, glandular secretion, and cardiac inhibition.
Parasympathetic Tone Reduction: mAChRs are primarily located on postganglionic neurons of the parasympathetic nervous system. By inhibiting these receptors, it reduces the overall parasympathetic tone, leading to an increase in sympathetic activity and a shift in the autonomic balance.
Smooth Muscle Relaxation: Inhibition of mAChRs in smooth muscle tissues leads to relaxation of these muscles. This can be observed in the gastrointestinal tract, where can reduce spasm and improve motility.
Reduced Secretion: mAChRs also regulate the secretion of various fluids, including saliva, tears, and mucus. Inhibition of these receptors by it leads to a reduction in secretion, which can be beneficial in certain conditions such as excessive sweating or salivation.
Cardiac Effects: Although the primary effects are mediated through mAChRs in the parasympathetic nervous system, it can also have indirect effects on the heart. By reducing parasympathetic tone, it can lead to an increase in heart rate and contractility.
Antiemetic: It has been used as an antiemetic agent to prevent nausea and vomiting, particularly in the context of motion sickness. Its ability to reduce parasympathetic tone and inhibit the vomiting center in the brain contributes to its effectiveness in this regard.
Research Tool: In scientific research, it is a valuable tool for studying the roles of mAChRs in various physiological and pathological processes. Its specificity as an mAChR antagonist allows researchers to investigate the consequences of mAChR inhibition on a wide range of systems and diseases.
In summary, methscopolamine bromide exerts its effects by competitively inhibiting the binding of acetylcholine to mAChRs, thereby modulating the physiological responses mediated by these receptors. Its ability to reduce parasympathetic tone and inhibit the activation of mAChRs leads to a range of physiological effects, including smooth muscle relaxation, reduced secretion, and potential cardiac effects. These properties make it a useful agent in both clinical and research settings.
Synthesis Method
Methscopolamine bromide is typically synthesized from the parent compound scopolamine or a related alkaloid found in plants such as Datura stramonium (Jimson weed). The synthesis often involves modification of the scopolamine structure to introduce the methyl bromide group. Here is a conceptual outline of a possible synthetic route:
Starting Material:
The starting material is usually scopolamine or a derivative that is structurally similar. Scopolamine itself is an alkaloid extracted from certain plants.
Protection and Functional Group Manipulation:
- Depending on the specific synthetic route, certain functional groups on the scopolamine molecule may need to be protected to prevent unwanted reactions during the synthesis.
- Functional group manipulation, such as esterification or alkylation, may be performed to modify the structure in preparation for the introduction of the methyl bromide group.
- The critical step in the synthesis involves the introduction of the methyl bromide group. This can be achieved through a variety of chemical reactions, such as alkylation or quaternization, depending on the specific functional groups present on the molecule.
- In some cases, the methyl bromide group may be introduced directly, while in others, an intermediate step may be required to form a suitable leaving group that can be displaced by bromide ions.
- After the methyl bromide group has been successfully introduced, the product (Methscopolamine-bromide) is isolated from the reaction mixture.
- Purification steps, such as recrystallization or chromatography, may be performed to obtain the desired purity of the final product.
What are the side effects of this compound?
Common side effects-Dry mouth: Due to its anticholinergic effect, this medication may inhibit saliva secretion, leading to dry mouth.
Blurred vision: Medications may affect eye muscles, leading to blurred vision or diplopia.Tachycardia: Medications may stimulate the heart, causing an increase in heart rate.Urinary retention: due to the inhibitory effect of drugs on bladder muscles, it may lead to urinary retention.Constipation: Medications may slow down intestinal peristalsis, leading to constipation.Sleepiness: Some patients may experience drowsiness or fatigue after use.
Serious side effects-Allergic reactions: A small number of patients may be allergic to the ingredients of the medication, experiencing symptoms such as rash, itching, and difficulty breathing.Neuroblocking malignant syndrome (NMS): This is a rare but potentially fatal symptom complex that may be related to the inhibitory effect of drugs on the nervous system.Other serious reactions, such as high fever, low blood pressure, tachycardia, etc., may be life-threatening and require immediate medical attention.
FAQ
What is methscopolamine-bromide used for?
Methscopolamine-bromide is a muscarinic antagonist used to treat peptic ulcers, nausea, vomiting, and motion sickness. A muscarinic antagonist used to study binding characteristics of muscarinic cholinergic receptors.
Is methscopolamine used for IBS?
Methscopolamine-bromide is an anticholinergic medication primarily used to treat gastrointestinal disorders such as peptic ulcers and irritable bowel syndrome. Its mechanism of action is centered around its ability to inhibit the action of acetylcholine on muscarinic receptors.
Is methscopolamine an antihistamine?
Brompheniramine, chlorpheniramine, and methscopolamine are antihistamines that reduce the effects of the natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
What is pyridostigmine bromide used for?
Pyridostigmine bromide, commonly abbreviated as PB, once served as a preventive medication deployed during the Gulf War, aiming to safeguard military personnel from toxic damages induced by lethal nerve agents. This pharmaceutical agent has already been applied clinically for over four decades as a conventional therapeutic drug against myasthenia gravis. Additionally, it can also be utilized in postoperative recovery stages to reverse the state of neuromuscular blockade (Williams, 1984).
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