Povidone Iodine (10% w/w) is a broad-spectrum topical antiseptic and disinfectant. It is a stable chemical complex of polyvinylpyrrolidone (povidone) and elemental iodine (10% w/w, equivalent to 1% available iodine). It is widely used in Indian clinical practice for its potent microbicidal activity against bacteria, viruses, fungi, protozoa, and spores. It works by releasing free iodine which oxidizes and iodinates microbial proteins, nucleotides, and fatty acids, leading to cell death. Its povidone component acts as a sustained-release reservoir, reducing iodine's irritation while maintaining efficacy.
Adult: Apply topically to affected area 1-3 times daily. For pre-surgical skin prep: apply generously, allow to dry. For wound care: cleanse wound, apply solution/ointment, may cover with sterile dressing.
Note: For external use only. Clean and dry the affected area before application. Apply a thin layer using sterile gauze or swab. Can be used as a soak or rinse for wounds (often diluted with sterile water/saline). For surgical scrub: apply to wet hands/forearms, scrub vigorously for 5 minutes, rinse. Do not cover with occlusive dressings unless advised. Avoid contact with eyes and mucous membranes at this concentration.
Povidone Iodine acts as a reservoir, slowly releasing free iodine (I2) in aqueous solution. The free iodine penetrates microbial cell walls and acts as a potent oxidizing agent. It iodinates tyrosine and histidine residues in microbial proteins and enzymes, and reacts with nucleotides (particularly thymine and cytosine) in DNA/RNA, disrupting structure and function. It also oxidizes sulfhydryl (-SH) groups in enzymes and unsaturated fatty acids in cell membranes, leading to loss of structural integrity and function, resulting in rapid microbial death.
Pregnancy: Category C (US FDA). Iodine crosses the placenta. Avoid large-scale or prolonged use, especially vaginal application in late pregnancy, due to risk of fetal thyroid suppression and goiter. Use only if clearly needed and benefit outweighs risk.
Driving: No effect on ability to drive or operate machinery.
| Lithium | Increased risk of hypothyroidism; additive effect on thyroid suppression. | Major |
| Antithyroid Drugs (Methimazole, Propylthiouracil) | Additive effect, may potentiate hypothyroidism. | Moderate |
| Radioactive Iodine (I-131) | Povidone iodine can block thyroid uptake of radioactive iodine, interfering with diagnostic/therapeutic efficacy. | Major |
| Hydrogen Peroxide, Tincture of Benzoin | Incompatible; may cause chemical irritation or inactivation. | Moderate |
| Silver-based Dressings (e.g., Silver Sulfadiazine) | Potential inactivation of both agents; not recommended for concurrent use on same site. | Moderate |
| Enzymatic Debriders (e.g., Collagenase) | Iodine may inactivate the enzyme. Rinse area thoroughly before applying debriding agent. | Moderate |