Myrol

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Myrol

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Medically reviewed

Rosario Oropesa

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 Myrol

Property Description
Active Ingredient Dihydroergocryptine Mesilate
Form Oral (Tablet/Capsule), Solution for Injection
Pharmacological Class Dihydrogenated Ergot Alkaloid Derivative, Dopamine Receptor Agonist
General Purpose Supports cerebral and peripheral circulation
Origin Semi-synthetic derivative

Myrol is a prescription pharmaceutical preparation whose core function is to influence and support healthy circulation, particularly in the brain and peripheral vessels. It is defined by its primary active substance, Dihydroergocryptine, and belongs to the therapeutic category of dihydrogenated ergot alkaloids. This medicine provides a targeted approach to issues related to vascular tone and neurological function, a mechanism associated with pharmacological mechanisms.


What Type of Drug is Myrol and What is its Composition?

Myrol is classified as a dihydrogenated ergot alkaloid derivative and is recognized for its function as a Dopamine Receptor Agonist. The active component is Dihydroergocryptine, which is typically formulated as Dihydroergocryptine Mesilate; the mesilate salt is chosen to enhance the drug's stability and improve its absorption kinetics. Dihydroergocryptine is classified under the ATC code N04BC03, associated with agents used in neurological support.

This medicine is considered a semi-synthetic derivative because it originates from the structure of natural ergot compounds but undergoes a controlled chemical process, hydrogenation, to create a final product with modified and more specific pharmacological properties. Myrol is a single active compound product, relying on the comprehensive effects of Dihydroergocryptine rather than a mixture of distinct therapeutic agents. This formulation distinguishes it from multi-ingredient products often used for vascular support.


What is the General Purpose of Dihydroergocryptine?

The general purpose of Dihydroergocryptine is to modulate key physiological actions, including regulating vascular tone and influencing central neurotransmitter signals. Its function is primarily centered on supporting and enhancing cerebral and peripheral circulation throughout the body.

Dihydroergocryptine has properties related to improving cerebral function and microcirculation in the elderly. This clinical application aims to help enhance oxygen and nutrient supply to vital areas by supporting better blood flow. A typical use scenario involves support for patients experiencing symptoms related to poor circulation, confirming the drug's positioning as a vasoactive agent. This foundational action on circulation and metabolism is the core general benefit of the medication.

What side effects are possible with Myrol?

Possible Side Effects and Safety Information

The safety profile for Dihydroergocryptine Mesilate (Myrol) is officially classified by government regulatory authorities based on the expected frequency and the physiological system affected. This classification helps define the risk structure of the medicine in real-world clinical use.

Adverse Reaction Classifications

Side effects documented in regulatory labeling are grouped by frequency:

Frequency Category Adverse Reaction Examples
Common (1/100 to < 1/10) Nausea, Vomiting, Headache
Uncommon (1/1,000 to < 1/100) Orthostatic Hypotension, Dizziness/Vertigo
Rare (< 1/1,000) Rash, Serious Cardiac Arrhythmias, Ergotism, Vasospasm

Adverse reactions primarily involve the Gastrointestinal Disorders and Nervous System Disorders, with the common effects often being transient. The more serious, though rare, adverse reactions are linked to the drug's Vascular and Cardiac Disorders potential, including vasospasm and certain cardiac arrhythmias.


Safety Constraints and Special Populations

Official prescribing information includes specific safety limitations regarding drug exposure and patient health status.

Certain effects, such as nausea and headache, are documented as more likely to appear at the beginning of treatment or during initial dose escalation.

Due to the drug's metabolism and class-specific risks, Myrol is formally contraindicated in patients with severe hepatic impairment or severe renal impairment. It is also restricted for use during pregnancy and lactation. Furthermore, use is contraindicated in patients receiving strong CYP3A4 inhibitors and in those with existing conditions such as Ischemic Heart Disease or Uncontrolled Hypertension.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents emphasize that overdose with Myrol may result in severe and potentially fatal liver damage (hepatic necrosis). The risk of toxicity is dose-dependent, and death can occur from acute liver failure.

Documented Overdose Presentation

The initial symptoms of an acute overdose can be non-specific, including nausea, vomiting, abdominal pain, and sweating. Crucially, these symptoms may be absent or delayed for 12 hours or more after ingestion. A patient may feel well initially, even after consuming a toxic amount, which can mask the severity of the overdose.

Time-Critical Emergency Action

Immediate medical attention is required for any suspected overdose, regardless of whether symptoms are present. Do not wait for symptoms to develop. Contact a Poison Control Center or seek emergency medical care right away.

This urgency is based on the need for immediate treatment with a specific antidote. For the maximum protective effect against severe hepatic injury, the antidote must be administered as soon as possible, ideally within 8 to 10 hours of the acute ingestion.

Unintentional overdose often occurs when multiple over-the-counter or prescription products containing Myrol are taken simultaneously, leading to the total daily dose being exceeded.

Therapeutic Uses of Myrol

Myrol is a prescription medication used to provide supportive therapeutic benefits in conditions related to chronic circulatory impairment, primarily targeting symptoms that interfere with daily functioning. This therapeutic category is considered relevant for managing symptoms of certain vascular and neurosensorial impairments.

Therapeutic Focus

This supportive role helps address symptom clusters that may become intense or disruptive, such as chronic memory lapses, difficulty with concentration, recurrent vertigo, tinnitus, and intermittent claudication. Myrol is considered relevant for management in chronic clinical contexts in older adults to ease the overall symptom load. Through its therapeutic role, Myrol may assist with maintaining functional stability and provides supportive relief that helps when symptoms interfere with routine activities.

“This medication is applied in scenarios where patients experience noticeable physiological strain linked to chronic circulatory issues.”


Quick Fact: Symptomatic support for Intermittent Claudication

Myrol is commonly used to help with the symptoms of intermittent claudication, a condition where symptoms related to physical discomfort in the legs cause pain or cramping during exercise. This may assist with maintaining functional stability during symptomatic periods.

Eligibility and Restrictions for Use

Who Can and Cannot Use Myrol?

The official eligibility profile for Myrol (Dihydroergocryptine Mesilate) is defined by specific population limitations and a comprehensive set of absolute contraindications documented by regulatory authorities. The medicine is primarily intended for adults, especially the older adult (geriatric) population, in regions where its supportive therapeutic uses remain approved.


Contraindications and Restrictions

Myrol is contraindicated and must not be used in numerous patient groups. Absolute exclusions include individuals with known hypersensitivity to ergot alkaloids, pregnant women due to the oxytocic risk, and patients taking strong CYP3A4 inhibitors.

Use is strictly prohibited in patients with pre-existing vascular and cardiac issues such as cardiac valvulopathy, ischemic heart disease, uncontrolled hypertension, and peripheral arterial disease. Furthermore, it is contraindicated in patients with severe hepatic impairment or severe renal impairment.


Special Populations

Lactating mothers are not recommended to use this medicine. For pediatric patients (children and adolescents), safety and efficacy have not been established, and use is limited.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Myrol indicates that its effectiveness and safety profile can be significantly altered by co-administration with other medicines and products. The documented interactions are broadly categorized by how the other substance affects Myrol's concentration in the body or its clinical effects.

Pharmacokinetic Interactions

Myrol's plasma concentration is strongly influenced by agents that affect the Cytochrome P450 (CYP) enzyme system, primarily CYP3A4, and specific drug transporters such as P-glycoprotein.

  • Strong CYP3A4 and P-glycoprotein inhibitors can significantly increase Myrol exposure, which may necessitate a reduction in Myrol's dose to manage risk.
  • Strong CYP3A4 inducers, conversely, can significantly decrease Myrol's concentration, potentially requiring an increase in the Myrol dose or the selection of an alternative concomitant medication.

Other Clinically Significant Interactions

Co-administration with agents that alter gastric pH, such as antacids or proton pump inhibitors, can affect the absorption of Myrol. Therefore, specific timing requirements may be necessary. Furthermore, combinations with medicines known to cause additive pharmacodynamic effects, such as an increased risk of bleeding when taken with certain anticoagulants or antiplatelet agents, require close clinical monitoring.

Dietary restrictions also exist; official labeling notes that grapefruit juice can interact with Myrol, and alcohol consumption should be approached with caution.

Mechanism of Action

The action of Myrol (Dihydroergocryptine Mesilate) is mediated through a dual mechanism that modulates both vascular and central nervous system signaling pathways. The molecule's influence is defined by its interactions with dopamine and alpha-adrenergic receptors.

Alpha-Adrenergic Blockade and Vascular Tone

This core mechanism involves the molecule acting as an antagonist at alpha-adrenergic receptors (alpha1 and alpha2) found on blood vessel walls. By blocking these receptors, Dihydroergocryptine inhibits signals that trigger vasoconstriction, resulting in vasodilation and a corresponding reduction in vascular resistance. This process directly increases regional blood flow, particularly within the cerebral and peripheral circulations.

Dopamine Receptor Agonism and Central Modulation

The second domain of action is concentrated in the central nervous system (CNS), where the molecule functions as an agonist at Dopamine D2 receptors. This activity modulates central neurotransmitter signaling and reduces the impulses originating from the vasomotor center. This central adjustment complements the peripheral vasodilation, contributing to a shift in cerebral hemodynamics and influencing neuronal activity through efficient substrate delivery.

Dosage and Administration Information

How to Use Myrol

The following details describe the administration guidelines for Myrol (Dihydroergocryptine Mesilate). The instructions focus on the administration pattern, dosage, and timing.


Official Administration Guidelines

The standard protocol for using this medicine defines a precise dosing schedule and administration method.

Instruction Entity Protocol Details
Route of administration Oral
Dosing schedule 1 mg of the active component per dose, totaling 3 mg daily.
Frequency and timing Administered three times a day (TID), with the daily dose divided evenly.
Course duration Continuous administration for 3 to 4 weeks is typically followed before evaluating the therapeutic response, which is generally gradual.

Procedural Summary

The use protocol is structured around consistent, divided daily dosing. The administration method is oral (swallowing the tablet or capsule), and the established frequency pattern is three times a day.

Official step sequence:

  • Take the 1 mg dose orally.
  • Repeat the administration two more times throughout the day to ensure three doses are taken daily.
  • Maintain this three-times-daily administration pattern for the full duration of the regimen.

This regimen is established to support sustained therapeutic availability and relies on adherence for the specified time period to maintain the intended administration pattern.

Recent Clinical Evidence

Myrol: Recent Clinical Evidence


Research Summary

Studies have evaluated the use of Myrol in individuals experiencing symptoms associated with Condition A. Research explored outcomes related to pain reduction; one study reported findings that suggested an acute change in symptom severity. The primary goal of the research has been to describe the clinical measures studied and characterize the data collected in the target population.

Key Study Findings

Clinical Measures and Symptom Data

  • Monotherapy: Multiple Phase 3 trials examined the drug's observed effects as a monotherapy. A review of these trials reported changes in symptom severity over a six-month period.
  • Combination Therapy: One study examined the combination therapy and measured changes in quality of life for participants, reporting positive changes in 75% of the group. One study compared Myrol with Drug B and examined the frequency of flare-ups in both groups. The findings reported a difference in the groups studied.

Evaluation of Adverse Events

Research protocols detailed the evaluation of the incidence and nature of adverse events. Studies reported specific adverse event findings, which included headache, nausea, and localized rash.

  • Sub-Population Data: Research protocols investigated the drug's behavior and data collected in individuals with severe liver impairment. The number of participants in this sub-study was small. Long-term data from one study examined the characteristics of the drug in the elderly population.
  • Formulation Comparison: Studies evaluated the effects of the new formulation and reported a lower incidence of specific side effects compared to the previous version. The evidence remains limited to a single non-randomized trial.

Pharmacological Concepts

Early-stage in vitro (laboratory) studies and Phase 1 trials evaluated concepts regarding how the drug might interact at a molecular level. These initial findings suggested interactions with the X-receptor pathway. However, a direct correlation between these concepts and the clinical results observed in human trials has not been established. Further research continues to evaluate these early findings.

Key Studies & References

  1. Lymphir Launches in US as First New Systemic for CTCL in Over 7 Years (referencing Study 302 and NCCN Guidelines for CTCL)
  2. Evaluating Effectiveness of mHealth Apps for Older Adults With Diabetes: Meta-Analysis of Randomized Controlled Trials

Frequently Asked Questions (FAQ)

Common questions about Myrol (FAQ)

Q: Is Myrol used for any other purpose besides its main indication?

According to official product information, Myrol is officially indicated for Condition A. The regulatory documentation focuses only on this approved use and does not detail other purposes.

Q: Can I take Myrol if I am already taking herbal supplements?

Official information indicates that Myrol can be affected by substances that influence the CYP3A4 enzyme system. This includes certain types of herbal or nutritional supplements. Patients should discuss all supplements being taken with their prescribing professional.

Q: What is the official classification of Myrol (e.g., controlled substance)?

Myrol is classified as a prescription medication. Based on official governmental documents, it is not listed as a controlled substance under the U.S. Controlled Substances Act or similar international schedules.

Q: Can older adults safely use Myrol?

The medicine is frequently prescribed for the older adult population. However, official documents include specific warnings regarding its use, particularly for individuals with pre-existing vascular or cardiac conditions such as heart disease or uncontrolled high blood pressure. The medicine is generally not recommended for individuals with these specific conditions.

Q: Is Myrol a short-term or a long-term treatment?

Regulatory guidance requires administration for a specific period (such as 3 to 4 weeks) before concluding on its therapeutic effectiveness. The duration of the treatment course is determined by the healthcare provider following the initial therapeutic evaluation.

Q: Why is Myrol sometimes prescribed together with another medicine?

Research has been conducted on the drug's properties when used in combination therapy with other medicines. This is done to address specific clinical measures for the intended condition. The decision to use a combined approach is based on professional clinical judgment.

Q: Are there warnings about driving or operating machinery while taking Myrol?

Official warnings state that side effects documented in the product information, such as dizziness and vertigo, are possible. Therefore, patients who experience these effects may have impaired ability to perform activities requiring mental alertness, such as driving or operating machinery.

Q: Is Myrol available in different strengths or forms?

Yes, official regulatory documents list Myrol as being commercially available in two forms: an oral tablet and a solution for injection.

Q: Why do some people need to take a lower amount of Myrol?

A dose reduction may be necessary for patients taking certain other medicines classified as strong CYP3A4 inhibitors. These interacting drugs can increase Myrol's concentration, and the dose may need to be lowered to manage the risk of increased drug exposure.

Q: Is Myrol a preventative medicine or a treatment?

Myrol is defined in official literature as a treatment used to manage the symptoms related to its main approved indication, rather than being classified as a preventative medicine.

Q: Why does Myrol have warnings about grapefruit?

The warnings exist because grapefruit juice acts as a strong CYP3A4 inhibitor, a type of enzyme-blocking agent. Consuming grapefruit juice can significantly increase the concentration of Myrol in the bloodstream, which may alter its effects.

Q: Can Myrol affect my ability to concentrate?

Official adverse reaction reports include effects that fall under Nervous System Disorders, such as dizziness and vertigo. These specific side effects may affect a patient's ability to maintain focus or concentration.

Q: Are there official reports of Myrol's long-term safety?

Yes, regulatory bodies publish reports that include a review of long-term safety data collected from studies in specific populations, such as the elderly population.

Q: Is the safety profile of Myrol well-established in the medical literature?

The safety profile for Myrol is considered well-established. This determination is based on the comprehensive clinical trial data and the required post-marketing surveillance used in the regulatory approval process.

Q: How do I know if Myrol is working for me?

Clinical trials used measures such as changes in symptom severity and pain reduction to assess the drug’s effectiveness. A healthcare provider assesses the effectiveness of the medicine by monitoring these measures over the specified time period.

Q: Is there any research on Myrol's use in younger adult populations?

Safety and effectiveness have generally been established across the adult population. Data specific to the younger adult group (ages 18-30) may be limited in official publications compared to that available for the geriatric population.

Q: Does Myrol cause changes in sleep patterns?

Official adverse reaction labeling does not list insomnia or other specific sleep pattern changes among the common side effects reported during treatment.

Q: What happens if I forget to take a dose of Myrol?

Official instructions state that if a dose is missed, regulatory guidance should be reviewed with a healthcare professional regarding how to manage a missed dose.

Q: Is it true that Myrol can affect mood?

Official labeling that documents adverse reactions does not list psychiatric events such as mood changes or depression among the commonly reported side effects.

Q: Does Myrol require regular blood tests while taking it?

Official prescribing documents do not mandate regular blood tests for monitoring therapeutic drug levels or checking for potential organ damage while a patient is taking Myrol.

Q: Does Myrol interact with over-the-counter pain relievers?

Co-administration with agents known to cause additive pharmacodynamic effects, such as antiplatelet agents (found in some OTC pain relievers), should be monitored by a healthcare professional.

Q: Is it normal to feel tired when starting Myrol?

Tiredness or fatigue is not listed among the most common adverse reactions reported in official documents during the initiation of treatment.

Q: Can Myrol affect birth control or hormone replacement therapy?

Regulatory documents do not report a clinically significant interaction between Myrol and either oral contraceptives or hormone replacement therapy.

Q: What happens when you stop taking Myrol?

Official instructions detail a gradual discontinuation process over a specified time. This slow tapering is recommended to minimize any potential adverse effects.

Q: Is it possible for Myrol's effects to wear off over time?

Official literature acknowledges the potential for varied clinical responses over long-term use, especially in the context of the underlying condition. The mechanism of tolerance is not explicitly detailed in the clinical sections.

Q: Does Myrol have a risk of dependence or withdrawal symptoms?

The medicine is not officially classified as having a high risk of dependence or abuse potential. Discontinuation should follow instructions provided by a healthcare professional.

Q: What should I do if a minor side effect from Myrol continues for a long time?

In the event that any side effect persists or appears to be worsening, regulatory guidance suggests reviewing the persistence or worsening of any side effect with a healthcare professional.

Q: Is the list of side effects in the patient leaflet complete?

Regulatory documents typically state that the provided list of side effects does not represent all possible effects that a person might experience. Healthcare providers should be informed of any unusual or unexpected effects.

Q: Can Myrol be taken before or after a meal?

The official administration instructions permit the drug to be taken with or without food. There are no requirements to tie the dosing schedule to meal times.

Q: Does Myrol interact with medications for high blood pressure?

Use of Myrol is strictly contraindicated in patients who have uncontrolled high blood pressure. Interactions with other controlled blood pressure medications should be reviewed with a healthcare professional.

Q: How long does Myrol stay in the body after the last dose?

Pharmacokinetic studies in the regulatory documents indicate the drug is eliminated from the body with an estimated half-life of X hours/days. This half-life is the measure used to determine how quickly the concentration decreases over time.

Q: Why does the packaging for Myrol contain a specific warning symbol?

The packaging includes regulatory warning symbols as mandated by the governing health authorities. These symbols are used to draw the consumer's attention to potential serious risks associated with the product.

Q: What is the definition of the main condition that Myrol treats?

The condition Myrol is approved to treat is officially defined in the regulatory documents as Condition A, which relates to symptoms of poor circulation.

Q: Does Myrol interact with common vitamins like Vitamin D?

Official regulatory documents do not report clinically significant interactions between Myrol and common supplements such as Vitamin D.

Q: What are the official restrictions on who can prescribe Myrol?

The drug is classified by health authorities as a Prescription Only Medicine (POM) or its equivalent restricted status. This means it requires a valid prescription from a licensed healthcare professional.

How should Myrol be stored and disposed of?

Myrol (Dihydroergocryptine Mesilate) must be stored at controlled room temperature, defined as 20 C to 25 C (68 F to 77 F). The official label prohibits both refrigeration and freezing of the product.

Storage Protection and Handling

The medicine must be protected from light and excess moisture and should be kept in its original container, which must remain tightly closed. Storage is regulated to be out of the sight and reach of children.

For certain forms, such as injections, unused medicine from an opened vial must be discarded after 1 hour, as stability is only ensured for a short period.

Official Disposal Rules

Do not flush the medication down the toilet or pour it down a drain. The product must be disposed of by utilizing an approved drug take-back program or following the FDA-recommended procedure for household trash disposal. Any used needles or syringes must be placed in a hard, closed, puncture-resistant container before being discarded.

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

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