What is Diosmin Ointment?
Diosmin ointment is a topical formulation of the flavonoid diosmin used primarily for treating acute hemorrhoidal disease and venous-related skin conditions, though it is not a standard treatment in major dermatology guidelines.
Primary Clinical Applications
Diosmin ointment is most established for managing acute hemorrhoids, where it reduces edema, erythema, pain, itching, and bleeding. 1 In a study of 50 patients with grades 1-4 hemorrhoids featuring strangulation and thrombosis, topical diosmin ointment produced 75% improvement in edema and 73% improvement in erythema over three consecutive weekly visits. 1
Mechanism of Action
The compound works through multiple pathways:
- Vascular effects: Enhances venous tone by prolonging post-synaptic response to norepinephrine and increasing vascular smooth muscle sensitivity to norepinephrine and calcium 2
- Anti-inflammatory properties: Acts as a reactive oxygen species scavenger, inhibits 5-lipoxygenase, and reduces prostaglandin E2 and thromboxane B2 production 2
- Lymphatic drainage: Increases lymphatic vessel contraction frequency and amplitude, thereby reducing edema 2
Dermatologic Applications Beyond Hemorrhoids
Topical diosmin shows promise for inflammatory skin conditions, though it is not included in major dermatology treatment guidelines for atopic dermatitis 3 or psoriasis 4.
Experimental Evidence:
- Skin inflammation: A 2% diosmin cream demonstrated significant vasoconstrictive effects (29% reduction in dilated capillaries, 49% reduction in capillary luminal area) and anti-inflammatory effects (36% reduction in IL-8 release) in substance P-induced inflammation models 5
- UV protection: The same formulation reduced hydrogen peroxide production by 45% and cyclobutane pyrimidine dimer formation by 36% following UVB irradiation 5
- Psoriasis research: Diosmin nanocrystal gel showed anti-inflammatory effects in imiquimod-induced psoriasis in rats by modulating TLR7/8/NF-κB and miRNA-31 pathways 6, though this remains experimental
Important Clinical Caveats
Diosmin ointment is not a first-line treatment for standard dermatologic conditions. The American Academy of Dermatology guidelines for atopic dermatitis 3 and psoriasis 4 do not include diosmin among recommended topical therapies. Standard treatments remain:
- For atopic dermatitis: topical corticosteroids, tacrolimus, pimecrolimus, crisaborole, or ruxolitinib 3
- For psoriasis: topical corticosteroids, vitamin D analogues, or tazarotene 4
Safety Profile
Diosmin ointment is very well tolerated with no significant unwanted side effects when properly used. 1 The topical formulation avoids the poor intestinal absorption that limits oral diosmin bioavailability. 5
How to Use
For acute hemorrhoids, apply topically to affected areas. 1 The treatment is most effective on edema and erythema, with improvements typically assessed over weekly visits. 1 For venous-related skin conditions, diosmin is more commonly used orally rather than topically, where it has extensive evidence for chronic venous insufficiency management. 2, 7