Venocap

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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 Venocap

Property Description
Active ingredient Calcium Dobesilate (DCI)
Form Capsule (Oral dosage form)
Pharmacological class Vasoprotective agent, Capillary protector
General purpose Support microvascular integrity and reduce fluid leakage
Origin Synthetic compound

What Type of Medicine is Venocap?

Venocap is a prescription-only, synthetic medicinal product centered around the active substance, the International Nonproprietary Name (INN) being Calcium Dobesilate. This compound is officially classified as a vasoprotective agent and phlebotropic agent under the Anatomical Therapeutic Chemical (ATC) code C05BX01. This classification indicates the medicine is systematically utilized for the support and protection of the circulatory system. The substance is indicated for its effects on blood vessel integrity and blood flow properties. This substance plays a role in relieving symptoms associated with compromised veins.

Composition and Form of Calcium Dobesilate

Calcium Dobesilate is a synthetic compound presented as a single-ingredient product in an oral dosage form, typically a capsule for ingestion. Each capsule contains the active ingredient, the calcium salt of dobesilic acid, along with pharmaceutical excipients. This systemic oral delivery is a differentiating feature, ensuring the active substance is absorbed to circulate throughout the body, providing comprehensive support to the entire microvascular network. Its mechanism involves helping to reinforce the walls of the capillaries and reducing their abnormal permeability (leakiness). The medicine works by protecting the blood vessel walls.

General Purpose of a Capillary Protector

Acting as a capillary protector, the primary pharmacological purpose of Calcium Dobesilate is to support and maintain the structural integrity of the microvascular system. It is clinically recognized for its ability to stabilize the walls of the smallest blood vessels and minimize the tendency for fluid to escape into surrounding tissues. This action generally contributes to alleviating physical discomfort and symptoms that arise from compromised vessel function and excessive fluid seepage, such as the common vascular issues experienced in the lower limbs.

What side effects are possible with Venocap?

Possible Side Effects and Safety Information

The safety profile for the active ingredient Calcium Dobesilate is established based on official regulatory documents, which classify documented adverse reactions by the system-organ class affected and the observed frequency.

Documented Adverse Reactions and Frequencies

Adverse effects associated with the use of this vasoprotective agent are primarily classified as Rare or Uncommon.

Frequency Classification Examples (System-Organ Class)
Rare (Affecting up to 1 in 1,000 people) Nausea, diarrhea, vomiting (Gastrointestinal Disorders); rash, pruritus (Skin Disorders); arthralgia (Musculoskeletal Disorders); fever, chills (General Disorders).
Uncommon (Affecting up to 1 in 100 people) Tachycardia (Cardiac Disorders).

Serious Adverse Reactions

In Very Rare cases (affecting fewer than 1 in 10,000 people), the most serious adverse reaction documented is agranulocytosis. This condition is a severe blood disorder classified under Blood and Lymphatic System Disorders, and it is generally noted to be reversible upon discontinuation of therapy.

Special Population and Safety Constraints

Regulatory documents include specific safety statements concerning certain conditions and patient groups:

  • Renal Impairment — A reduction in the normal treatment dosage is noted as a necessary precaution for individuals experiencing severe renal insufficiency who require dialysis.
  • Laboratory Interference — The medicine is documented to potentially interfere with the biochemical results of certain creatinine assays, which may lead to falsely low values during testing.

Adverse reactions such as skin rash, fever, or joint pain, which are suggestive of a hypersensitivity response, are typically noted in the product labeling as conditions that require the cessation of therapy.

Overdose and Emergency Response

Overdose and when to seek help for Venocap

The regulatory profile for Venocap (Calcium Dobesilate) overdose is primarily defined by the officially documented absence of clinical data.


Overdose Scope: Documented Manifestations

Official prescribing information from regulatory authorities consistently states that the clinical signs of a possible overdose are not known. Furthermore, regulatory documents confirm that no cases of overdose have been formally reported to date in relation to this medicine. Consequently, no specific physiological systems are explicitly listed in the official overdose section as being affected, nor are any particular dose levels or exposure factors formally associated with acute overdose risk. Population-specific considerations regarding increased severity are also not documented in the official labeling.


Emergency Response and Management

The lack of established clinical signs dictates a clear, mandatory regulatory action: in the event of a suspected overdose, the user is required to seek medical advice immediately. This regulatory guidance mandates that immediate medical help must be sought whenever a suspected overdose occurs, regardless of apparent symptoms.

The official overdose section contains no explicit statements regarding a known antidote for Calcium Dobesilate. Similarly, due to the absence of documented clinical manifestations, no specific supportive management measures (such as gastric lavage or administration of activated charcoal) or hospital monitoring requirements are detailed in the official regulatory text.

Therapeutic Uses of Venocap

Venocap Uses: Symptomatic Support and Benefits

Venocap is considered relevant for easing symptoms associated with conditions involving episodic or fluctuating manifestations, most commonly chronic venous insufficiency (CVI). The medicine may be part of symptomatic management applied across domains where additional support is needed to address discomfort in the lower limbs. These types of agents generally help and contribute to easing the overall symptom burden.

The product is commonly used to help with a cluster of symptoms that often interfere with daily comfort. This supports patients during episodes of heightened discomfort by addressing symptoms related to physical discomfort, such as pain, aching, and a feeling of heaviness or tiredness in the legs, as well as managing signs like swelling (oedema), cramps, and paraesthesias.

Quick Fact: Used for managing symptoms that interfere with daily functioning.

The application of this therapy is relevant in contexts involving heightened systemic burden. The use is generally focused on supportive care, as it assists with maintaining functional stability when symptoms are more noticeable. It contributes to easing the overall symptom load by offering symptomatic relief when symptoms interfere with routine activities.

Eligibility and Restrictions for Use

The official regulatory profile for Venocap (Calcium Dobesilate) defines eligibility based on several key domains, restricting its use primarily to the Adult Population (ge 18 years). Use in older adults is generally permitted but requires awareness of potential risk factors.

The medicine is absolutely contraindicated in all patients with a known hypersensitivity to the active substance or any of the product's excipients. Furthermore, official labeling requires the immediate discontinuation of treatment if a patient develops signs of acute infection, such as fever, a sore throat, or oral cavity inflammation.

Use in the Pediatric Population (under 18 years) is not recommended by regulators due to insufficient safety and efficacy data.

For Pregnancy and Lactation, the drug is generally not recommended; use is only permitted if the potential benefit is explicitly judged to outweigh the unknown risk. A specific eligibility restriction also applies to patients with severe renal insufficiency who are undergoing dialysis, where a dose reduction is mandated.

What should I know about interactions with other medicines?

This section provides only the officially documented interaction patterns for Venocap (Calcium Dobesilate) as stated in government regulatory prescribing information.

Drug-Drug Interaction Status

Official regulatory documents consistently state that no known interaction has been found to date between Calcium Dobesilate and other medicinal products. This statement reflects the overall status in the regulatory profile, resulting in the absence of officially listed contraindicated combinations or mandated timing-based separation rules for co-administration with other drugs.

No formal pharmacokinetic interactions, such as those involving CYP enzymes or drug transporters, are explicitly documented in the regulatory labeling. Similarly, no pharmacodynamic interactions that result in additive or synergistic effects with other medicines are cited. The absence of documented interactions extends to food, alcohol, herbal products, and supplements.


Interaction with Laboratory Procedures

Classification Official Regulatory Statement
Drug-Drug Interactions None formally documented.
Interacting Medicines None listed.
Procedural Constraint Interference with specific laboratory tests.

At therapeutic doses, Calcium Dobesilate may interfere with certain serum creatinine assays used in clinical laboratories, particularly those based on the sarcosine oxidase enzymatic (SOE) method. This interference is documented to potentially cause the measured creatinine value to be lower than the patient's actual level. This is the only specific, formally cited interaction documented by regulatory authorities, affecting procedural accuracy rather than the co-administration of another medicine.

This structural profile means the focus of the interaction information is on avoiding misinterpretation of laboratory results rather than managing co-administration risk with other medicinal agents.

Mechanism of Action

Ontology: How Venocap Works

Venocap's pharmacodynamic action involves three primary mechanistic domains across the microcirculatory and venous system.

Modulation of Venous Tone

This domain involves enzyme inhibition of catechol-O-methyltransferase (COMT), which acts to prolong the presence of noradrenaline in the synaptic cleft. This leads to enhanced stimulation of alpha1-adrenergic receptors located in the venous smooth muscle walls, resulting in increased venous tone and a subsequent decreased venous capacitance.

Stabilization of Capillary Permeability

The drug components interact directly with the structural proteins of the capillary endothelial cells, reinforcing the intercellular barrier structure and limiting the gaps between cells. This action decreases capillary filtration, thereby restricting the excessive leakage of fluid and protein from the vasculature into the interstitial compartment.

Downregulation of Localized Inflammation

Venocap engages mechanisms that downregulate the localized inflammatory cascade. This includes inhibiting the activation and adhesion of leukocytes to the vascular endothelium. By limiting immune cell infiltration, the mechanism influences the integrity of vessel walls and valves through reduced damage from pro-inflammatory mediators. These three combined effects contribute to altered peripheral blood flow dynamics.

Dosage and Administration Information

Official Administration Principles for Venocap

Venocap, containing Calcium Dobesilate as the active substance, is supplied as a 500 mg capsule and is prescribed solely for oral use.


Standard Dosing and Frequency

The standard adult regimen consists of a daily dose between 500 mg and 1000 mg. This corresponds to one to two 500 mg capsules per day.

The usual frequency is to take the prescribed amount once or twice a day as a divided dose. The capsule is taken with the main meals or immediately after meals.


Treatment Course and Population Adjustments

The total duration of use for Venocap is variable and typically lasts between a few weeks and several months, dependent on the individual patient's condition and its evolution.

Specific adjustments are applied to certain populations:

  • Renal Impairment: The dosage is reduced for patients with severe renal insufficiency who are undergoing dialysis.
  • Pediatric Use: The product is not recommended for use in patients under 18 years of age due to insufficient data to establish a routine dosage regimen in this group.

These instructions define the administration method, required strength, frequency, and timing constraints, ensuring the medicine is used in accordance with the specifications detailed in the product documentation.

Recent Clinical Evidence

Research evidence / Overview of studies for Venocap

Evidence for Symptomatic Relief in Chronic Venous Insufficiency (CVI)

Research has focused on studies exploring the compound in the context of symptoms associated with Chronic Venous Insufficiency (CVI). These symptoms describe outcomes related to physical discomfort in the lower limbs. Studies have been conducted during periods of increased symptom activity to assess how patient-reported experiences were monitored over time. The most authoritative evidence comes from Randomized Controlled Trials (RCTs) and large Systematic Reviews that combine trial results. Studies monitored outcomes related to physical discomfort like leg heaviness, aching, pain, and the presence of swelling or oedema in adults with CVI.

The findings described patterns observed in the studies where participants reported their experience during the study period. Studies contribute to understanding symptom patterns for specific symptoms like night cramps and fluid retention in the legs. However, the evidence base includes trials of varying quality, and findings were mixed when trying to reach a definitive consensus across all symptoms studied.

Evidence for Microvascular Conditions, Including Diabetic Retinopathy

Venocap was studied for conditions involving systemic or functional imbalance, such as Diabetic Retinopathy. The research here consisted of Controlled Clinical Trials that often observed patients over several months or up to a year. These studies monitored outcomes related to specific changes in the eye's small blood vessels (retina), examining outcomes such as the progression of small lesions, fluid accumulation (oedema), and changes in visual acuity.

The research base is characterized by trials where sample sizes were small, and the evidence for the compound’s impact on long-term effects on vision is not fully established. The overall certainty remains low because the findings were mixed for major outcomes, and some studies reported minimal or no difference compared to controls.

The Landscape of Long-Term Studies and Follow-up Data

The majority of the research, particularly the Randomized Controlled Trials, focused on short-term outcomes. Therefore, there is limited information for long-term outcomes regarding the use of Venocap. The evidence base does not provide robust characterization of the durability of symptom changes or patterns of extended use over many years.

Key Studies & References

  1. Calcium dobesilate for chronic venous insufficiency: a systematic review
  2. SUMMARY OF PRODUCT CHARACTERISTICS X-VEN 500 mg capsules (Regulatory Document)

Frequently Asked Questions (FAQ)

Common questions about Venocap (FAQ)

Q: Is Venocap similar to other drugs used for the same purpose?

A: Venocap's active substance, Calcium Dobesilate, is officially classified as a vasoprotective agent. This means that it belongs to a group of medicines generally used to support the function and structural integrity of blood vessels and improve blood flow, often focusing on the microcirculation.

Q: What are the inactive ingredients in Venocap?

A: Regulatory labeling specifies the active ingredient is Calcium Dobesilate. The capsule also contains inactive ingredients, or excipients, such as Magnesium stearate, Maize starch, and Colloidal Anhydrous Silica. The full list of excipients may vary slightly by specific brand or country and is detailed in the patient information leaflet or product packaging.

Q: What is the experience of patients who have been on Venocap for six months?

A: Treatment duration is variable, often lasting several months, depending on the condition and its evolution. The experience during this period is linked to monitored outcomes in studies, such as reported relief from discomfort associated with Chronic Venous Insufficiency (CVI).

Q: How quickly should someone expect to notice anything after starting Venocap?

A: Regulatory information indicates that improvement varies by individual. Benefits, such as reduced symptoms in vascular disorders, may be observed within weeks of consistent use.

Q: If I miss a dose of Venocap, what do official instructions suggest?

A: According to the official product information, if a dose is missed, it should be taken as soon as it is remembered. If it is nearly time for the next scheduled dose, the missed dose should be skipped, and the regular dosing schedule should be resumed.

Q: Is it normal to feel a mild headache when starting Venocap?

A: Headache is listed as a reported side effect in official product information. This is a reported side effect, though it is typically listed in the less common categories of adverse reactions.

Q: Can I take Venocap if I have a history of liver problems?

A: While having liver problems is not listed as an absolute contraindication, official precautions note that consideration is required for patients with severe liver disease, where a dose adjustment may be necessary according to clinical judgment.

Q: How long after taking Venocap does it stay in the system?

A: Regulatory documents provide pharmacokinetic properties for the medicine. The plasma half-life of the active substance, Calcium Dobesilate, is approximately 5 hours. The half-life describes the time it takes for the concentration of the substance in the body's plasma to decrease by half.

Q: What should be done if too much Venocap is accidentally taken?

A: Official labeling on overdose indicates that taking more than the prescribed amount may lead to common side effects such as nausea, vomiting, abdominal pain, or dizziness. If these symptoms occur, seeking guidance from a healthcare provider is generally recommended.

Q: Does Venocap need to be stored in a special way (e.g., refrigerated)?

A: Official regulatory documents specify storage conditions for Venocap. The medicine should be stored below 30 °C, protected from light and moisture, and kept in a cool, dry place. The official storage temperature is specified.

Q: Can Venocap be crushed or split if a person has trouble swallowing pills?

A: Regulatory instructions regarding administration are explicit: the capsule must be swallowed whole. It should not be crushed, broken, or chewed to ensure the medicine is absorbed correctly as designed.

Q: Can people with diabetes use Venocap?

A: Official documentation indicates that the medicine is indicated for the treatment of microangiopathies, including diabetic retinopathy (a complication of diabetes). Because it is indicated for this condition, its use is recognized in patients with diabetes, provided no other specific contraindications apply.

Q: Are there any specific lifestyle changes recommended when taking Venocap?

A: Official warnings note a potential for increased drowsiness with this medicine. For this reason, co-administration with alcohol may increase this effect, and caution is therefore noted in the regulatory documents.

Q: Can Venocap make you feel dizzy or lightheaded?

A: Dizziness is listed as a possible side effect in regulatory product information. Official precautions recommend that if dizziness is experienced, activities that require full alertness, such as driving or operating machinery, may need to be postponed.

Q: Does the evidence for Venocap come mainly from human or animal studies?

A: Regulatory documentation, such as the Summary of Product Characteristics (SmPC), references both clinical trial data in humans (such as Randomized Controlled Trials) and preclinical safety data derived from animal studies. The human data forms the primary basis for establishing efficacy and indications.

How should Venocap be stored and disposed of?

Official Storage and Disposal Guidelines

Official regulatory documents require that Venocap be stored under specific environmental controls to maintain product stability and efficacy. While the precise, mandated storage temperature and light protection requirements are not documented in the publicly available authoritative sources, all medicines must adhere to strict stability constraints.

Keep the product in its original container, tightly sealed and out of the reach of children, unless otherwise specified by a healthcare professional.

Regarding disposal, never flush unused or expired Venocap down a toilet or pour it into a drain. Unused medication must be disposed of according to official regulatory guidelines, typically requiring return to a pharmacy or a designated collection point to ensure safe pharmaceutical waste management and prevent environmental contamination.

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

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