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Diosmin: Effects, Uses and Dosage

Diosmin is a plant-derived flavonoid used to strengthen veins and treat venous disorders such as chronic venous insufficiency and hemorrhoids.

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Things worth knowing about "Diosmin"

Diosmin is a plant-derived flavonoid used to strengthen veins and treat venous disorders such as chronic venous insufficiency and hemorrhoids.

What is Diosmin?

Diosmin is a naturally occurring flavonoid glycoside found primarily in citrus fruits, especially in unripe bitter oranges (Citrus aurantium). It belongs to the subclass of flavones and is widely used in medicine as a venotonic agent. Diosmin is closely related to hesperidin, another citrus flavonoid, and is frequently formulated in combination with it as a standardized pharmaceutical preparation.

Mechanism of Action

Diosmin exerts its effects through several pharmacological mechanisms:

Venotonic effect: Diosmin increases the tone of the venous wall by inhibiting the breakdown of norepinephrine, thereby prolonging its vasoconstrictive action on the vessel walls.
Improvement of microcirculation: The compound enhances blood flow in small vessels (capillaries) and reduces excessive permeability of capillary walls, helping to prevent fluid leakage into surrounding tissue.
Anti-inflammatory properties: Diosmin inhibits the release of inflammatory mediators such as prostaglandins and free radicals, counteracting inflammatory processes within the vascular system.
Lymphatic drainage support: It enhances lymphatic function, supporting the removal of excess tissue fluid and helping to reduce edema.

Indications and Uses

Diosmin is primarily used for the treatment and prevention of venous and lymphatic disorders. Key indications include:

Chronic venous insufficiency (CVI): Weakness of the venous valves and venous wall, leading to heaviness, pain, and swelling in the legs.
Varicose veins: Supportive treatment of enlarged, twisted superficial veins.
Hemorrhoids: Relief of symptoms in acute and chronic hemorrhoidal disease.
Lymphedema: Adjunctive therapy for swelling caused by impaired lymphatic drainage.
Leg heaviness and edema: General support for tired, heavy legs and swelling, also commonly used during pregnancy.

Dosage and Administration

Diosmin is available in the form of tablets, capsules, or granules. Clinical studies commonly use therapeutic doses of 450–900 mg of diosmin per day, often in combination with hesperidin (e.g., as a micronized purified flavonoid fraction containing 90% diosmin and 10% hesperidin). The appropriate dosage should be determined in consultation with a healthcare professional. For acute hemorrhoids, higher initial doses are typically used, followed by a maintenance dose.

Side Effects

Diosmin is generally considered well tolerated. Possible side effects include:

Gastrointestinal complaints such as nausea, diarrhea, or stomach pain
Headache
Rarely: allergic reactions

Serious adverse effects are uncommon. However, individuals with known allergies to flavonoids or citrus plants should avoid diosmin-containing products.

Safety and Interactions

Depending on the country and concentration, diosmin is available either as a dietary supplement or as a licensed medicinal product. Use during pregnancy and breastfeeding should only be considered under medical supervision, as the available data are limited. Potential interactions with anticoagulants (blood thinners) and certain cardiac medications have been reported and should be discussed with a physician before use.

Scientific Evidence

Several controlled clinical trials support the efficacy of diosmin, particularly in combination with hesperidin, for chronic venous insufficiency and hemorrhoidal disease. European guidelines on venous disorders (such as those from the European Venous Forum) recognize flavonoids including diosmin as an adjunctive treatment option. Evidence for additional indications such as lymphedema is promising but not yet conclusive.

References

Nicolaides A.N. et al. - Management of Chronic Venous Disorders of the Lower Limbs: Guidelines According to Scientific Evidence. International Angiology, 2018.
Lyseng-Williamson K.A., Perry C.M. - Micronised Purified Flavonoid Fraction: A Review of its Use in Chronic Venous Insufficiency, Venous Ulcers and Haemorrhoids. Drugs, 2003;63(1):71–100.
European Medicines Agency (EMA) - Assessment Report on Citrus sinensis and related species, 2017.

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