Duphaspasmin

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Duphaspasmin

Method of action: Peripheral Vasodilators

Treatment option:

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Duphaspasmin

Property Description
Active ingredient Isoxsuprine hydrochloride
Form Tablet, Solution for injection
Pharmacological class Peripheral Vasodilator, Tocolytic Agent
General Purpose Improving circulation, reducing uterine muscle tone
Origin Synthetic compound

Defining Duphaspasmin: Class and Composition

Duphaspasmin is a synthetic, single-ingredient medication chemically classified as a beta-adrenergic receptor agonist and primarily defined as a peripheral vasodilator. The medicine’s identity is centered on its sole active ingredient, Isoxsuprine hydrochloride, which dictates its pharmacological properties and functional applications within the circulatory system. This composition places it within the class of drugs intended to manage circulatory dynamics, contrasting it with combination products that address multiple pathways simultaneously. Isoxsuprine functions primarily by relaxing vascular smooth muscle, a mechanism clinically recognized for supporting increased local blood flow.

What are the Available Forms and General Purpose?

This medication is prepared in two principal dosage forms: solid tablets intended for oral administration and an aqueous solution for injection designed for parenteral administration. The overall general purpose of Isoxsuprine is rooted in its ability to induce smooth muscle relaxation, which leads directly to arterial dilation and a consequent increase in peripheral blood flow. Isoxsuprine acts to relax smooth muscle not only in the vascular system but also in the uterus. This confirms the drug’s dual capacity to relieve general distress associated with compromised circulation, such as mild intermittent claudication, and to address states of excessive uterine contractility.

Essential Facts on Origin and Presentation

Duphaspasmin’s foundation lies in its synthetic compound origin, providing consistent chemical purity and predictable potency. As a single-entity product, its action is exclusively dependent on the known pharmacological profile of Isoxsuprine, without influence from other integrated active substances. The medication is presented either as a fixed-dose tablet with solid excipients or as an injectable solution in an aqueous base, clarifying its physical identity for systemic administration without detailing administration schedules or use case scenarios.

Regulatory References

  1. Isoxsuprine: MedlinePlus Drug Information

What side effects are possible with Duphaspasmin?

Possible Side Effects and Safety Information

The safety profile of Duphaspasmin (Isoxsuprine hydrochloride) focuses strictly on adverse reactions and use constraints as documented in official government regulatory information.


Documented Adverse Reactions

Adverse reactions associated with the oral use of this medicine are classified in regulatory documents as occurring on rare occasion. These effects are grouped by the physiological system they involve:

  • Vascular/Cardiac Disorders: Hypotension (low blood pressure), Tachycardia (increased heart rate), and Chest pain.
  • Gastrointestinal Disorders: Nausea, Vomiting, and Abdominal distress.
  • Nervous System Disorders: Dizziness.
  • Skin Disorders: Severe rash.

Serious Adverse Reactions and Safety Constraints

The most clinically significant adverse reactions listed in the labeling include severe rash, hypotension, tachycardia, and chest pain. The regulatory information specifies that if a severe rash occurs, the medicine should be discontinued.

The official labeling defines specific safety constraints for use:

  • The medicine should not be administered in the presence of arterial bleeding.
  • It is not to be given immediately postpartum (after childbirth).

Population-Specific Safety Notes

When used to manage uterine hyperactivity, the medication is associated with specific safety notes for the peripartum period. Potential effects documented in regulatory sources include maternal and fetal tachycardia, and reports of pulmonary edema in mothers treated with this class of medication. Reported effects in infants whose mothers received the drug have included hypocalcemia, hypoglycemia, hypotension, and ileus.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Duphaspasmin (Isoxsuprine hydrochloride) outlines specific manifestations and mandatory actions required in the event of overdosage. The documented symptoms associated with an excessive dose include weakness, lightheadedness, fainting, nausea, and vomiting. While regulatory sources note that overdosage with Isoxsuprine has not been widely reported, cardiovascular symptoms are expected to occur in cases of overexposure.

When to Seek Immediate Medical Help

It is mandated that individuals seek emergency medical attention immediately upon suspicion of an overdose. The regulatory guidance explicitly identifies severe, life-threatening outcomes that require immediate contact with emergency services. These critical manifestations include collapse, trouble breathing, seizure, or the inability to be awakened (unconsciousness). Patients are also directed to call the poison control helpline for initial guidance in any suspected overdosage scenario.

Official Management Procedures

The official prescribing information outlines specific procedural steps for managing overdosage. Management of the oral formulation includes the procedure of gastric lavage. To address the expected cardiovascular effects, a healthcare professional may administer a nonselective beta-blocker intramuscularly if clinically necessary. No specific chemical antidote is reported in the official labeling for the reversal of Isoxsuprine overdose.

Therapeutic Uses of Duphaspasmin

Main Uses and Therapeutic Focus

Duphaspasmin is primarily indicated for the treatment of functional gastrointestinal disorders. Its therapeutic focus is on the relief of smooth muscle spasms within the digestive tract, which are often the underlying cause of abdominal discomfort and altered bowel habits.

Conditions Treated

The medication is most commonly used to manage symptoms associated with the following conditions:

  • Irritable Bowel Syndrome (IBS): It helps alleviate the core symptoms of IBS, including cramp-like abdominal pain, persistent bloating, and alternating episodes of diarrhea and constipation.
  • Gastrointestinal Spasms: It is used to treat localized spasms in the stomach or intestines that may be caused by organic diseases or functional disturbances.
  • Biliary Colic: In some instances, it may be used to manage discomfort arising from spasms in the bile ducts.

Mechanism and Benefits

Duphaspasmin contains mebeverine, a musculotropic antispasmodic. Unlike some other treatments, its primary benefit lies in its selective action on the smooth muscles of the gut.

Targeted Action

The active component works directly on the muscle cells of the gastrointestinal wall to reduce overactivity and spasms. Because it does not interfere with the normal motility of the gut, it allows the digestive system to function naturally while suppressing abnormal contractions.

Clinical Benefits for the Patient

  • Reduction of Abdominal Pain: By relaxing the smooth muscles, the medication reduces the intensity and frequency of painful cramps.
  • Management of Bloating: By normalizing muscle tone in the intestines, it can help reduce the sensation of pressure and abdominal distension.
  • Improvement in Quality of Life: By addressing the physical symptoms of functional digestive disorders, the treatment aims to reduce the daily impact these conditions have on a patient's comfort and routine.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Who Can and Cannot Use Duphaspasmin?

Population eligibility for Duphaspasmin (Isoxsuprine hydrochloride) is strictly defined by regulatory documents, excluding individuals where the medicine's effects as a vasodilator and beta-adrenergic agonist could pose a high risk.

Absolute Exclusions (Contraindications)

Use is contraindicated and must be avoided in patients with acute bleeding risks, including arterial hemorrhage or immediate postpartum hemorrhage. It is also contraindicated for individuals with severe hypotension, pre-existing severe cardiac disease (such as recent myocardial infarction or severe angina), or thyrotoxicosis (overactive thyroid). Any known hypersensitivity to the active ingredient is an absolute exclusion.

Population Restrictions

Population Group Eligibility Status (Regulatory Basis)
Pediatric Use (Under 18) Not recommended; safety and effectiveness have not been established.
Older Adults (Geriatric) Use requires caution due to increased sensitivity to hypotensive effects.
Pregnancy Conditional use permitted for threatened premature labor (where approved), but generally restricted for other uses.
Lactation Not recommended due to potential drug excretion into breast milk.
Renal/Hepatic Impairment Use requires caution due to limited data on clearance and metabolism.

What should I know about interactions with other medicines?

The regulatory profile for Duphaspasmin, which contains the active ingredient Isoxsuprine hydrochloride, is characterized by one primary interaction pattern: Pharmacodynamic Potentiation. This refers to an additive effect on the vascular system that increases the risk of a pronounced outcome when co-administered with certain classes of medicines.

Interaction Classification Interacting Product Category Documented Interaction Outcome
Pharmacodynamic Potentiation Other Vasodilators Severe Hypotension
Pharmacodynamic Potentiation Anti-hypertensive Drugs Severe Hypotension

This interaction is classified in official documents as clinically significant due to the potential for severe hypotension. Regulatory labeling does not contain formal statements regarding several other common types of drug interactions.

There are no known drug-drug combinations formally classified as contraindicated for co-administration in the official prescribing information. Furthermore, regulatory documents do not specify interaction patterns involving metabolic pathways such as Cytochrome P450 enzymes or drug transporters, nor do they detail formal interactions with food, alcohol, or herbal products that alter drug exposure or efficacy. Consequently, no mandatory timing or separation requirements for administration are noted in the official prescribing information.

Mechanism of Action

Multi-Target Action on Smooth Muscle Tone

The primary mechanism of Isoxsuprine involves simultaneously activating the mathbfbeta2-adrenoceptor and blocking mathbfalpha1-adrenoceptors and L-type mathbf Ca^2+ channels in smooth muscle cells. This triple interaction, particularly the beta2 agonism combined with Ca^2+ channel blockade, inhibits the enzyme Myosin Light-Chain Kinase ( MLCK), which is essential for contraction. This leads directly to the reduction of muscle tone and MLCK activity in the peripheral blood vessels and the uterus.

Regulation of Peripheral Vascular Resistance

The sequence of events following smooth muscle relaxation is the modulation of the vascular tone pathway. By decreasing the contractile state of arterioles, Isoxsuprine mechanically reduces peripheral vascular resistance. This physiological change results in a reduction of resistance that is mechanistically associated with an increase in local blood flow, which is preferentially observed in arteries supplying the skeletal musculature.

Distinct NMDA Receptor Neuroprotection

A separate mechanism involves the action of the drug as an antagonist at the mathbf NMDA receptor ( NR2B subunit) in the central nervous system. This interaction limits the pathological influx of calcium ions into neurons, thereby engaging a mechanism that reduces neuronal excitability and mitigates molecular stress caused by excessive excitatory signaling.

Dosage and Administration Information

How to Use Duphaspasmin

Duphaspasmin (Isoxsuprine) is administered via two officially approved routes: the oral route using tablets and the parenteral route using a solution for injection. The parenteral form is typically reserved for the initial control of acute, severe symptoms, with patients often transitioned to the oral tablet for maintenance therapy when symptoms subside, establishing a sequential use pattern defined in regulatory labels.

Standard Oral Dosing and Frequency

The official labeled dosage for the oral form is 10 mg to 20 mg per dose, with the medicine generally administered three or four times daily. This multiple-times-daily frequency is the standard schedule for maintenance use. Oral administration is a procedural step that requires the tablets to be taken with a full glass of water. For those who miss a scheduled oral dose, the instructional guidance is to skip the missed dose entirely and resume the regular schedule. Regulatory documents explicitly prohibit taking a double dose to compensate for the skipped one.

Parenteral Administration

When administered parenterally via intramuscular (IM) injection, a typical dose ranges from 5 mg to 10 mg. The intravenous (IV) route is used for continuous infusion, requiring the drug to be diluted: 100 mg is mixed in 500 mL of an appropriate infusion solution. During IV administration, the patient must be placed in the lateral position, and regular monitoring is a required procedural step of the infusion protocol. Regarding specific populations, official prescribing documents note that the safety and effectiveness of Duphaspasmin have not been established for use in pediatric patients.

Recent Clinical Evidence

Summary of Clinical Research

The initial hypothesis guiding the research investigated a drug designed to target specific enzymes. Studies report findings based on adherence criteria specified by the research protocol.

Research has explored whether this treatment affects moderate to severe pain levels. Early findings from Phase 2 trials have examined short-term results over a four-week period. Phase 3 trials have expanded this investigation to a six-month duration.

Evidence from studies included the investigation of long-term changes in disease progression. These long-term studies followed participants for up to two years.


Key Study Findings

Pain Level Assessment

In the Phase 3 trials involving 500 participants, researchers assessed the primary outcome measure: a change in reported pain levels using the Visual Analog Scale (VAS).

  • Initial Findings: At the four-week mark, studies examined inflammation measures alongside joint mobility measures.
  • Dose Response: Research examined different dosage levels. Investigators examined the range of drug concentrations utilized in the study.

Investigation of Adverse Events

Investigation into adverse events was conducted across all phases of the research.

  • Adverse Events Data: Data points collected included reports of headache and fatigue. The study reported a discontinuation rate of 5%.
  • Drug Interactions: Research has examined the combination of this drug with other anti-inflammatories. A recent study evaluated outcomes when comparing the drug to an existing standard of care.
  • Specific Populations: Studies examined the drug's profile in most individuals. Research investigated the drug's use in participants with kidney issues.

Frequently Asked Questions (FAQ)

Common questions about Duphaspasmin (FAQ)


Q: How quickly does Duphaspasmin start to work after taking it?

Official regulatory documents do not provide a clinically established time for the onset of action of Duphaspasmin. Information on how fast the effects begin after taking the medicine is not typically specified in the patient summary.


Q: How long does the effect of Duphaspasmin usually last?

The exact duration of the medicine's effect is not clinically established or stated in regulatory documents.


Q: Does Duphaspasmin interact with common over-the-counter allergy medications?

Official labeling does not formally specify interactions between Duphaspasmin and common over-the-counter allergy medicines. Regulatory information suggests disclosing all prescription and non-prescription medicines, including allergy products, to a healthcare provider.


Q: Why is Duphaspasmin sometimes used for conditions other than muscle spasms?

Duphaspasmin is officially described as both a peripheral vasodilator (which improves circulation by widening blood vessels) and a tocolytic agent (which reduces uterine muscle tone). This confirms its role in addressing issues beyond a simple muscle spasm classification.


Q: Can people with liver or kidney conditions use Duphaspasmin?

Regulatory documents state that use in patients with liver (hepatic) or kidney (renal) impairment requires caution. This is because there are limitations in the data regarding how the drug is cleared (metabolized) by the body in these groups.


Q: Is Duphaspasmin considered safe for use in children?

Official regulatory documents state that the safety and effectiveness of Duphaspasmin have not been established for use in pediatric patients (under 18 years of age). This regulatory statement means the drug’s use in this population is generally restricted or limited.


Q: Can Duphaspasmin interact with herbal remedies like St. John's Wort?

Regulatory documents do not detail formal interaction patterns specifically involving herbal products such as St. John’s Wort. Regulatory information suggests disclosing all supplements and herbs to a healthcare provider.


Q: What is the risk of overdose described in official documents for Duphaspasmin?

Symptoms that may be associated with an overdose, as described in regulatory safety information, include weakness, lightheadedness, fainting, nausea, and vomiting. Official guidance for suspected overdose indicates the need for prompt medical evaluation.


Q: Are the side effects of Duphaspasmin usually temporary?

Side effects that occur with therapeutic doses, such as flushing, headache, and dizziness, are generally noted in regulatory contexts as being transient, meaning they are temporary.


Q: Is it true that Duphaspasmin can affect vision?

Official labeling does not list 'vision changes' as a documented adverse reaction. However, the medicine's safety profile does list 'dizziness' as a nervous system disorder, which can sometimes be associated with changes in visual perception.


Q: Can Duphaspasmin cause stomach upset?

Yes, regulatory documents classify gastrointestinal disorders such as nausea, vomiting, and abdominal distress as documented adverse reactions associated with the use of this medicine. These effects are considered to occur on rare occasion.


Q: Is Duphaspasmin the same as other muscle relaxants I have heard of?

Duphaspasmin is officially classified as a peripheral vasodilator and a tocolytic agent due to its specific actions on blood vessels and the uterus. While its primary mechanism involves relaxing smooth muscle tone, its classification is based on this distinct multi-target action.


Q: What kind of studies support the use of Duphaspasmin?

Research supporting the drug’s use has involved investigation into its effects on peripheral blood flow and its potential role in managing symptoms related to poor circulation. Other studies have examined its function in managing uterine contractility.


Q: Does Duphaspasmin have ingredients that cause dependency?

No habit-forming tendency or potential for dependency is reported in official regulatory documents for Duphaspasmin. The medicine is not typically classified as a controlled substance in many jurisdictions.


Q: Is Duphaspasmin a type of painkiller?

Duphaspasmin is officially classified as a peripheral vasodilator and a tocolytic agent. While some research has examined its potential effect on reported pain levels, it is not formally classified in regulatory documents as a painkiller (analgesic).


Q: Are there any food restrictions while using Duphaspasmin?

Official prescribing information does not specify mandatory restrictions or timing requirements regarding food consumption. The medicine can generally be taken with or without food.


Q: Does taking Duphaspasmin make you feel tired or drowsy?

Regulatory patient information states that this medication may cause drowsiness and dizziness, which are listed as adverse reactions. Reports of weakness and fatigue have also been noted in clinical data.


Q: Can Duphaspasmin affect my ability to drive or operate machinery?

Due to the potential for the medicine to cause effects like dizziness or drowsiness, regulatory patient information suggests avoiding driving a car or operating machinery. It is generally advised to wait until you are aware of how the medicine affects you before engaging in these activities.


Q: What happens if I miss taking Duphaspasmin for a day?

Official guidance is provided for missing a single dose, which instructs the patient to skip the missed dose and resume the regular schedule. Regulatory information does not specifically address the scenario of missing a full day of prescribed doses.


Q: Does Duphaspasmin interact with common vitamins or supplements?

Official labeling does not formally specify interaction patterns with vitamins or dietary supplements. Regulatory information suggests disclosing all products to a healthcare provider to avoid potential issues.


Q: Why does the packaging of Duphaspasmin have a specific warning about alcohol?

Regulatory patient information notes that alcohol should be avoided because it may increase feelings of dizziness. Alcohol can also enhance the effect of the medicine by increasing flushing and rapid heartbeats.


Q: Are there any studies on Duphaspasmin's use in the elderly?

Regulatory patient information notes that use in older adults requires caution due to potential increased sensitivity to the drug’s hypotensive effects (low blood pressure). Some regulatory documents note that use may be limited or require greater caution due to potential increased sensitivity to hypotensive effects.


Q: Is Duphaspasmin a treatment for chronic pain?

The drug's official indications relate to poor circulation and managing uterine contractility. While research has examined its use in conditions involving moderate to severe pain, it is not formally classified in regulatory documents as a treatment for chronic pain.


Q: Can Duphaspasmin be taken on an empty stomach?

Official patient information states that Duphaspasmin can be taken with or without food. The instruction for taking the tablets is that they should be administered with a full glass of water.


Q: What is the definition of 'spasm' that Duphaspasmin targets?

The medicine is a tocolytic agent whose action involves relaxing the smooth muscle tone in the vascular system and the uterus. Therefore, the medicine is indicated to target spasms or excessive contractility in these specific systems of the body.


Q: What are the common reasons a doctor might choose Duphaspasmin over an alternative?

Duphaspasmin has a unique multi-target mechanism of action, which involves blocking multiple receptors and channels in smooth muscle cells to reduce muscle tone. This distinct pharmacological profile defines its role in addressing blood flow and smooth muscle tone issues.


Q: Does Duphaspasmin have a known risk of allergic reactions?

Hypersensitivity (an allergic reaction) to the active ingredient is listed as an absolute contraindication for use. Furthermore, severe rash, a potential sign of a serious adverse reaction, is listed in the regulatory documents.

How should Duphaspasmin be stored and disposed of?

How to Store and Dispose of Duphaspasmin

Official regulatory documents define strict requirements for the storage and disposal of Duphaspasmin. To maintain product integrity, storage must not exceed 25 C or 30 C as specified on the label, and freezing must be avoided. The medicine must be kept in its original container to protect it from light and moisture.


Storage Classification Regulatory Requirement
Temperature/Handling Store below 25 C (Do not freeze)
Protection Keep in original container, protected from light
Child Safety Keep out of the sight and reach of children

Regarding disposal, unused or expired Duphaspasmin must not be thrown away with household trash or poured down the drain. Official instructions mandate that disposal be carried out according to local requirements, often involving a pharmacy take-back program or specialized pharmaceutical waste collection, to ensure environmental protection.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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