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Daflon is an oral micronized purified phlebotonic flavonoid fraction containing 90% diosmin and 10% hesperidin. It is manufactured by Laboratoires Servier and often used to treat or manage disorders of the blood vessels.[1][2] Flavonoids are a type of phytochemical that have been associated with various effects on human health and are a component of many different pharmaceutical, nutraceutical, and cosmetic preparations.[3] Diosmin is a flavone glycoside that is derived from hesperidin. Hesperidin is a flavone that is extracted from citrus fruits.[4]

Vein diseases and hemorrhoids

[edit]

Daflon is not an FDA-approved medication, and therefore it cannot be advertised for treatment of diseases in the United States. Daflon is under preliminary research for its potential use in treating vein diseases,[5] or hemorrhoids.[6] It is sold as a drug in France,[7][8] Spain,[9] Malaysia,[10][11] Portugal, Belgium and Egypt.

There is moderate certainty evidence for the effectiveness of daflon for slightly reducing oedema compared to placebo in the treatment of chronic venous insufficiency.[12] Little to no differences in quality of life after treatment with Daflon were found and there is low certainty evidence that this class of drugs do not influence ulcer healing.[12] Diosmiplex, a micronized purified flavonoid fraction of daflon, with similar venous insufficiency indication, is sold as a prescription medical food in the US.[13]

Pharmacological activity

[edit]

Daflon plays a crucial role in the prevention of perivascular edema formation and treatment of venous stasis. This activity can be explained by its antagonist activity against prostaglandin E2 (PgE2) and thromboxane (TxA2) biosynthesis leading to inhibition of inflammatory process. Moreover, it also has a contraction activity on the lymphatic vessels which cause the lymphatic flow maximal.[14]

Dosage

[edit]

For venous insufficiency, the dosage is 2 tablets of 500mg daily. For acute hemorrhoidal attack, the dosage is 6 tablets daily for 4 days, followed by 4 tablets daily over the next 3 days.[15] For chronic venous disease, the dosage is 2 tablets a day for at least 2 months.[16]

Side effects

[edit]

Possible side effects include routine gastric disorders and neurovegetative disorders, however, toxicology studies indicate that diosmin is quite safe.[2] Diosmin interacts in an inhibitory manner with some metabolic enzymes so drug-interactions are probable.[2]

References

[edit]
[edit]
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Daflon

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from Grokipedia
Daflon is an oral phlebotonic medication consisting of a micronized purified flavonoid fraction, with each 500 mg tablet containing 450 mg diosmin (90%) and 50 mg hesperidin (10%), manufactured by Les Laboratoires Servier. It functions as both a venotonic agent, which increases venous tone, and a vasculoprotector, which enhances resistance in small blood vessels and normalizes capillary permeability. Primarily indicated for the symptomatic relief of chronic venolymphatic insufficiency—such as heavy legs, pain, and swelling—and acute hemorrhoidal attacks, Daflon is available in 500 mg and 1000 mg formulations. The drug's dual pharmacological action includes effects that limit leukocyte infiltration and protect venous , contributing to improved and reduced symptoms in venous disorders. Clinical studies have demonstrated its in treating advanced stages of , with benefits including decreased leg pain, , and functional discomfort after consistent use. Daflon is typically dosed at two 500 mg tablets daily for ongoing venous symptoms, or higher short-term regimens for acute , and is not recommended for individuals under 18 years old. Derived from found in fruits, it represents a well-established option for managing circulatory issues without significant impact on daily activities like driving.

Composition and Formulation

Active Ingredients

Daflon is formulated with a micronized purified fraction (MPFF) as its primary active substance, a standardized extract rich in derived from fruits. Each 500 mg tablet contains 450 mg of (90%) and 50 mg of (10%). is a semi-synthetic glycoside produced by the from , involving an oxidation process to introduce a in its structure. In contrast, is a naturally occurring glycoside extracted from fruits such as oranges. The MPFF undergoes a process that reduces the particle size of the to less than 2 microns, which improves their and enhances upon oral administration. This ensures over 80% of particles are smaller than 2.9 microns, facilitating better absorption compared to non-micronized forms.

Dosage Forms

Daflon is primarily formulated as film-coated tablets in two strengths: 500 mg (Daflon 500) and 1000 mg (Daflon 1000). These oral dosage forms are designed for convenient administration and contain a micronized purified flavonoid fraction as the active component. The Daflon 500 mg tablets are orange, oblong, and biconvex, facilitating easy swallowing. They are packaged in blister packs (PVC/aluminum) typically containing 30 or 60 tablets per carton, though other pack sizes such as 15, 20, 36, 100, or 120 may be available depending on the market. The Daflon 1000 mg tablets are also orange and oblong film-coated tablets, supplied in blister packs of 30 tablets, with variations like 18, 36, or 40 tablets possible in certain regions. Inactive ingredients in the Daflon 500 mg tablets include sodium starch glycolate, , , , and in the tablet core. The film-coating comprises , (E171), , sodium lauryl sulfate, 6000, yellow (E172), red (E172), and , which contribute to the orange coloration and protective layer. For the 1000 mg tablets, the excipients are similar, with the addition of orange flavor in the core to enhance . Storage conditions for both formulations recommend keeping the tablets at below 30°C (15-30°C range), in the original carton to protect from and . This ensures stability and prevents degradation of the micronized active fraction.

Medical Uses

Venous Insufficiency and

Daflon, a micronized purified flavonoid fraction (MPFF), is primarily indicated for the of (CVI), addressing key manifestations such as leg pain, heaviness, swelling, cramps, and restless legs. These symptoms arise from impaired venous function in the lower limbs, and Daflon has demonstrated efficacy in alleviating them through its venoactive properties. Clinical evidence supports its use in reducing the intensity of these discomforts, with patients reporting significant improvements in daily activities and . In terms of symptom relief, Daflon effectively reduces by decreasing leg volume and ankle circumference, while enhancing venous return and microcirculatory function to mitigate fluid accumulation. This action helps prevent the progression of CVI to more severe complications, such as venous ulcers, by supporting vascular integrity and reducing inflammation in the affected tissues. Its pharmacological basis involves modulating venous tone and lymphatic drainage, which contributes to these benefits (detailed in ). Daflon is particularly effective in patients classified under stages C3 to C6 of the for venous disorders, encompassing (C3), changes (C4), healed ulcers (C5), and active ulcers (C6). In these advanced stages, it improves clinical signs and symptoms, including trophic disorders like , and enhances overall venous health in specific populations with moderate to severe CVI. For long-term management, Daflon plays a crucial role in maintaining venous health by sustaining symptom control and reducing the recurrence of and related complications over extended periods, such as 6 months or more. This supportive aids in preventing progression and supports conservative strategies in ongoing CVI care.

Hemorrhoids

Daflon, a micronized purified flavonoid fraction (MPFF) consisting primarily of and , is indicated for the management of acute hemorrhoidal attacks characterized by pain, bleeding, and , as well as chronic hemorrhoidal involving symptoms such as itching and . In acute cases, it addresses sudden exacerbations of anorectal vascular congestion, while in chronic conditions, it targets persistent venous insufficiency in the hemorrhoidal leading to discomfort and tissue changes. The medication effectively manages key symptoms by reducing , , and anal discomfort, with clinical studies demonstrating significant improvements in , pruritus, tenesmus, and as early as day 2 of treatment. Its effects, mediated by inhibition of metabolites, contribute to this relief in hemorrhoidal disease. Additionally, Daflon aids recovery following hemorrhoidectomy by decreasing postoperative , , and the risk of secondary , with randomized trials showing a reduction from 6.1% to 0.9% in bleeding incidence. Daflon is particularly effective for both internal and external , especially in grades I-III, where it improves proctoscopic findings and symptom severity across these classifications. It serves an adjunctive role in severe cases, often combined with topical agents or surgical interventions to enhance outcomes, such as when added to conventional treatments for acute crises to further reduce bleeding and improve .

Other Indications

Daflon, a micronized purified fraction (MPFF) consisting primarily of and , has shown potential in managing by improving lymphatic drainage and reducing volume. In patients with post-mastectomy , treatment with Daflon 500 mg twice daily for 6 months showed improvements in subjective symptoms such as heaviness and tension, and in lymphatic parameters in severe cases, though no significant reduction in limb volume compared to . Similarly, in primary and secondary cases, including those associated with , Daflon has reduced volume and improved , with studies reporting up to a 30% reduction in affected limb measurements after 90 days of therapy at 500 mg twice daily. These benefits are linked to Daflon's ability to enhance lymphatic flow and decrease hyperpermeability, though results vary based on severity. Off-label applications of Daflon include the control of idiopathic epistaxis, where it serves as an adjunct to reduce bleeding frequency and severity. A involving patients with recurrent idiopathic nosebleeds found that Daflon 500 mg twice daily for three months significantly lowered epistaxis episodes compared to no treatment, with sustained effects observed up to six months post-treatment, likely due to its vasoconstrictive and properties on . Additionally, Daflon has been explored as an adjunct in management to support glycemic control and mitigate cardiovascular risks. In a clinical study of diabetic patients, administration of Daflon 500 mg twice daily for 45 days reduced blood glucose levels by approximately 15% and improved lipid profiles, including lowered triglycerides and total , potentially through its and endothelial protective actions. Investigational uses of Daflon extend to (PCS), where it may alleviate chronic pelvic pain and venous reflux symptoms. Preliminary trials indicate that Daflon 500 mg twice daily for three months decreases pain intensity and improves venous outflow in women with PCS, as measured by Doppler ultrasound, outperforming in symptom relief. In (PTS), Daflon has been evaluated for preventing or reducing long-term complications following deep vein thrombosis. Adjunctive therapy with (a key component of Daflon) alongside anticoagulants like has shown a reduced incidence of PTS, with one study reporting a 50% lower risk in treated groups, alongside improvements in leg edema and pain scores after six months. Further research, including the MUFFIN-PTS trial, is evaluating MPFF's potential role in symptom management for PTS, though larger confirmatory studies are needed. These indications remain off-label and are not approved by the U.S. (FDA), where Daflon is available only as a rather than a . Evidence for these uses primarily derives from smaller-scale clinical trials and regional practices in and , with calls for more robust, large-scale randomized controlled trials to establish efficacy and safety.

Pharmacology

Mechanism of Action

Daflon, a micronized purified flavonoid fraction consisting primarily of and , exerts its venotonic effects by reinforcing venous wall tone through prolongation of noradrenergic activity on vascular , thereby reducing venous distensibility, capacitance, and . This action helps alleviate venous by improving the contractile response of veins to endogenous catecholamines. In the , Daflon decreases hyperpermeability and enhances resistance to rupture by stabilizing endothelial barriers and inhibiting the and migration of leukocytes to the vessel wall. These effects mitigate the leakage of plasma proteins and fluids into surrounding tissues, preserving microvascular integrity during inflammatory conditions. Daflon's anti-inflammatory properties stem from its inhibition of (PGE2) and (TxA2) synthesis, which reduces the mediation of and platelet aggregation. Additionally, it exhibits activity by scavenging generated by activated neutrophils, thereby limiting oxidative damage to endothelial cells and decreasing leukotriene production that exacerbates . Regarding lymphatic function, Daflon promotes drainage by increasing the contractility of lymphatic vessels and reducing lymph pressure, which facilitates the clearance of interstitial fluid and proteins to counteract edema formation.

Pharmacokinetics

Daflon, a micronized purified flavonoid fraction consisting primarily of diosmin (90%) and hesperidin (10%), exhibits rapid oral absorption following administration. The micronization process reduces particle size to less than 2 μm, significantly enhancing bioavailability compared to non-micronized forms; studies report absorption rates of approximately 58% for the micronized formulation versus 33% for non-micronized diosmin, as measured by urinary excretion of total radioactivity. Peak plasma concentrations of the primary active metabolite, diosmetin, are typically attained within 1 to 3 hours post-dose, with maximum levels around 0.3 μg/mL after a 500 mg dose. Upon oral intake, undergoes in the intestine by microfloral enzymes to yield the aglycone diosmetin, which is subsequently absorbed into the systemic circulation; unchanged is not detected in plasma. In the liver, diosmetin is further metabolized via phase II conjugation, primarily forming and derivatives, which represent the predominant circulating forms. These metabolites contribute to the drug's prolonged presence in the body. Diosmetin and its conjugates demonstrate extensive distribution throughout the body, with a ranging from 54 to 70 L, and preferential accumulation in venous and lymphatic endothelial tissues. The elimination of diosmetin is 26 to 43 hours, which supports convenient once- or twice-daily dosing regimens. Excretion occurs mainly via the fecal route (60% to 80% of the dose), reflecting enterohepatic recirculation and incomplete absorption, while urinary elimination accounts for 10% to 20%, primarily as minor conjugated metabolites. Steady-state plasma concentrations are generally reached after 2 to 3 days of repeated dosing due to the extended . No unchanged diosmin or diosmetin is found in urine, underscoring the reliance on fecal pathways.

Clinical Evidence

Efficacy Studies

The study, a large international double-blind, -controlled trial involving 5,052 patients with (CVI), evaluated Daflon 500 mg administered twice daily for 6 months. It demonstrated significant improvements in key symptoms including pain, heaviness, swelling, cramps, pruritus, and , with the global symptom score reducing by approximately 50-70% in the Daflon group compared to lesser reductions in the arm. , assessed via the CIVIQ questionnaire, also improved notably in treated patients. For , multi-center observational and prospective studies have shown Daflon to effectively reduce bleeding, pain, and other symptoms when used adjunctively with standard care, with significant improvements observed after short-term treatment and better proctoscopic findings. Long-term studies, including a 1-year evaluation of Daflon in CVI patients, have confirmed sustained benefits such as ongoing improvements in via CIVIQ scores. A found that closure rates increased by 32% when Daflon was added to compression therapy over 6 months. In a 6-month trial focused on venous s, only 7% of Daflon-treated patients required the full duration, with significantly higher healing rates observed from week 8 onward regardless of ulcer size. Meta-analyses, including the 2020 Cochrane review on phlebotonics, provide moderate-certainty evidence that phlebotonics like Daflon probably reduce oedema slightly in CVI, with low- to moderate-certainty evidence for improvements in other symptoms such as heaviness and cramps, and little or no difference in . A 2018 meta-analysis of double-blind placebo-controlled studies further substantiated these findings, showing Daflon significantly enhances individual symptoms and overall patient .

Safety Profile

Daflon, a micronized purified flavonoid fraction consisting of and , has demonstrated good tolerability in long-term clinical use, with studies confirming safety for up to one year of continuous administration in patients with . In these trials, dropout rates due to s remained low, typically below 5%, reflecting the drug's favorable profile during extended therapy. No significant impacts on cognitive function or ability to drive and operate machinery have been reported, consistent with its mild spectrum. The 2020 Cochrane review noted moderate-certainty evidence of a higher of s with phlebotonics compared to . The most common adverse events associated with Daflon are gastrointestinal in nature, including , dyspepsia, , and , occurring in 1-10% of users across clinical evaluations. These effects are generally mild and transient, with no evidence of serious cardiovascular or hepatic adverse signals in either short- or long-term studies. Rare events include , , , pruritus, and urticaria (0.01-0.1% incidence), while uncommon gastrointestinal issues like affect 0.1-1% of patients. Preclinical toxicology studies indicate no mutagenic, genotoxic, or carcinogenic effects for Daflon, with no special hazards identified in repeated-dose, , or assessments in animals. These findings support its use without routine monitoring for oncogenic risks or impacts. Post-marketing has confirmed Daflon's safety in millions of patients worldwide, with only rare reports of reactions such as isolated facial or eyelid and exceptionally Quincke's edema; no major safety alerts or withdrawals have been issued by regulatory authorities. Common side effects observed in clinical settings, such as mild gastrointestinal disturbances, align with post-marketing data without indicating new concerns.

Dosage and Administration

Standard Regimens

Daflon, available as 500 mg film-coated tablets, is administered orally with meals to enhance tolerability and absorption. The standard regimens are designed for symptom relief in primary indications, with durations adjusted based on clinical response and symptom control. For (CVI), the recommended treatment consists of 500 mg twice daily (total 1,000 mg/day) at mealtimes, with duration adjusted based on clinical response and symptom control, often continued long-term to sustain venous tone and reduce symptoms such as leg heaviness and . In acute hemorrhoidal attacks, the regimen involves 3,000 mg (six 500 mg tablets) daily for 4 days, followed by 2,000 mg (four 500 mg tablets) daily for the subsequent 3 days, providing rapid relief from pain, swelling, and bleeding. For chronic , the recommended approach is 500 mg twice daily (total 1,000 mg/day) at mealtimes, with duration adjusted based on clinical response to prevent recurrences and improve anorectal function. The twice-daily dosing schedule aligns with Daflon's pharmacokinetic profile, ensuring steady-state levels for optimal therapeutic effect.

Special Populations

Daflon is preferably avoided during due to limited clinical data on its use in pregnant women, although animal studies have not shown evidence of . As a precautionary measure, it should only be used if the potential benefits outweigh the risks, particularly after the first trimester where some short-term use for conditions like hemorrhoidal disease has been reported as safe and effective in limited studies. During breastfeeding, Daflon is not recommended because it is unknown whether its active substances or metabolites are excreted in human milk, and a risk to the cannot be excluded. If treatment is deemed necessary, discontinuation of breastfeeding or the drug should be considered, with close monitoring of the if use proceeds. No dose adjustment is required for patients with renal or hepatic impairment, although no specific studies have been conducted in these populations; however, caution is advised in severe cases, with regular monitoring of renal and hepatic function recommended. Daflon is not approved for use in pediatric patients, as its and have not been established in children and adolescents under 18 years of age. In elderly patients, standard dosing regimens apply, but caution is warranted due to potential comorbidities, and a lower starting dose may be considered under supervision to minimize risks.

Adverse Effects and Precautions

Common Adverse Effects

Daflon, consisting of micronized purified flavonoid fraction (MPFF) with and , is associated with a low incidence of mild adverse effects, primarily gastrointestinal in nature, as observed in clinical trials involving over 4,000 patients. Gastrointestinal disturbances are the most common, including (incidence approximately 2.3%), dyspepsia (1.3%), (1.1%), and (0.9%), affecting about 6.9% of patients overall and typically resolving spontaneously. Neurological effects such as (1.0%), (0.6%), and (0.3%) occur in roughly 1.7% of users, often mild and transient. Other mild reactions include pruritus and (each around 0.3-0.4%), which generally do not require discontinuation of therapy. Management typically involves dose reduction or , as these effects are self-limiting in most cases. The overall incidence remains low and similar to across trials.

Contraindications and Interactions

Daflon, a micronized purified flavonoid fraction consisting primarily of and , is contraindicated in patients with to the active substances or any of the excipients. This includes known allergies to such as or , which may manifest as allergic reactions including or pruritus. Precautions are advised for individuals with a history of to . No dose adjustment is required in patients with renal or hepatic impairment, although data are limited. Daflon is not recommended during unless the potential benefits outweigh the risks, as human data are limited and animal studies show no . Use during is not recommended due to unknown in human ; a decision should be made whether to discontinue or the drug. Drug interactions with Daflon are minimal, with no clinically relevant interactions reported from post-marketing surveillance or dedicated studies. However, evidence indicates that may inhibit enzyme activity, potentially leading to mild potentiation of drugs metabolized by this pathway when co-administered with strong inhibitors such as . No significant interactions have been observed with antiplatelet agents like aspirin or anticoagulants like , though general caution with risk factors is prudent. Regarding alcohol, consumption should be moderated, as it may increase the risk of gastrointestinal disturbances, such as or , which are already potential side effects of Daflon, and could worsen underlying venous or hemorrhoidal conditions.

History and Regulatory Status

Development and Approval

Daflon, a micronized purified flavonoid fraction (MPFF) primarily composed of , traces its origins to itself, which was first isolated in 1925 from the plant Scrophularia nodosa. entered clinical use in 1969 as a phlebotonic agent for treating venous disorders, including leg ulcers and , due to its vascular protective properties. Laboratoires Servier developed Daflon in the late by micronizing and other to particles smaller than 2 µm, enhancing dissolution rates, absorption, and compared to non-micronized forms. This stemmed from Servier's focused research on for venous diseases, including preclinical demonstrating phlebotonic effects such as improved venous tone and reduced capillary hyperpermeability, followed by early human trials confirming these benefits. Key regulatory milestones include Daflon's initial launch in during the , marking its entry as a prescription venotonic drug. Pivotal clinical trials in the , such as double-blind studies on acute , established MPFF's efficacy in reducing symptoms like bleeding and pain, supporting broader approvals across . Servier holds patents on MPFF formulations, emphasizing the micronized composition for optimal therapeutic effects; however, these have expired in several regions, enabling the availability of generic versions.

Global Availability

Daflon, a micronized purified flavonoid fraction consisting primarily of and , holds marketing authorizations across numerous regions worldwide. In , it is approved by the (EMA) and available through national authorizations in countries such as , , and , where it is indicated for venous circulatory disorders. Approvals extend to , including via Servier India Private Limited and the through the (FDA), as well as in nations like , , , , and . In many of these markets, particularly for acute hemorrhoidal attacks, Daflon is classified as over-the-counter (OTC) for mild symptoms, while requiring a prescription for (CVI). The primary manufacturer of Daflon is Les Laboratoires Servier, based in , with production centered at facilities like the Oril Industrie site in . Servier has invested significantly in scaling production, including a €100 million commitment in 2021 to double the output of Daflon's , aligning with goals for sustainable manufacturing. Generic versions, often as micronized / combinations, are available in markets like the , , and the , following demonstrations to the reference product. As Servier's top-selling product, Daflon generated €622 million in for the 2023/2024 , underscoring its strong global market presence driven by demand for venous disorder treatments. However, it lacks approval from the U.S. (FDA) as a and is instead accessible as a containing and . This regulatory distinction limits its promotion for specific medical conditions , where it is marketed primarily for general circulatory support.

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