Povidone Iodine (5% w/v) is a broad-spectrum topical antiseptic and disinfectant solution. It is a stable chemical complex of polyvinylpyrrolidone (povidone, PVP) and elemental iodine (I2), containing approximately 10% available iodine. It is widely used in Indian clinical practice for its potent microbicidal activity against bacteria (including MRSA), viruses (including enveloped viruses like SARS-CoV-2), fungi, protozoa, and bacterial spores. Its action is rapid, and it maintains a sustained reservoir of active iodine due to the slow release from the PVP complex, reducing irritation compared to tincture of iodine.
Adult: Apply topically to affected area 1-3 times daily. For pre-operative skin prep: apply generously, allow to dry. For surgical scrub: wash for 5 minutes. For wound care: apply after cleansing, may cover with dressing.
Note: For intact skin: Apply and allow to air dry. For wounds: Cleanse wound thoroughly with sterile water/saline to remove organic debris before application. Do not use occlusive dressings over large treated areas. For mucous membranes: Use appropriate diluted solutions (e.g., 1% for gargle, 0.5% for vaginal wash). Rinse after use on oral mucosa.
Povidone Iodine acts by delivering free iodine (I2) in a sustained, controlled manner from its complex with povidone. The free iodine penetrates the cell wall of microorganisms and oxidizes key cellular structures. It iodinates nucleotides, fatty acids, and amino acids, leading to denaturation of proteins, enzymes, and membrane components, resulting in cell death.
Pregnancy: Category C (US FDA). Iodine crosses the placenta. Avoid large-scale or prolonged use, especially in the third trimester, due to risk of fetal hypothyroidism and goiter. Use only if clearly needed and benefit outweighs risk.
Driving: No effect on ability to drive or operate machinery.
| Lithium | Concurrent use may potentiate hypothyroid and goitrogenic effects. | Major |
| Antithyroid Drugs (Methimazole, Propylthiouracil) | Povidone iodine may interfere with therapy for hyperthyroidism. | Major |
| Radioactive Iodine (I-131) | Topical iodine can block thyroid uptake, interfering with diagnostic tests or therapy. Discontinue at least 2 weeks prior. | Major |
| Hydrogen Peroxide, Tincture of Benzoin | Incompatible; may cause chemical irritation or inactivation. | Moderate |
| Silver-based Dressings (e.g., Silver Sulfadiazine) | Concurrent application may lead to inactivation of both agents and formation of irritating complexes. | Moderate |
| Mercurial Antiseptics | Risk of forming irritating iodide compounds. Avoid concurrent use. | Moderate |
Same composition (Povidone Iodine (5% w/v)), different brands: