POVIDONE IODINE
Clinical safety rating: caution
Comprehensive clinical and safety monograph for POVIDONE IODINE (POVIDONE IODINE).
Povidone-iodine is an iodophor that releases free iodine upon contact with skin or mucous membranes. Free iodine penetrates microbial cell walls and oxidizes essential cellular components, including proteins, nucleotides, and fatty acids, leading to rapid microbial death. It exhibits bactericidal, fungicidal, and virucidal activity.
| Metabolism | Povidone-iodine is not significantly metabolized. After topical application, free iodine is absorbed and reduced to iodide in the body. The povidone polymer is excreted renally. |
| Excretion | Renal elimination of iodide; free iodine (I2) is rapidly converted to iodide in blood; ~90% of absorbed iodide excreted renally; remainder in feces, sweat, and saliva. |
| Half-life | Iodide half-life approximately 2 days (48 hours); clinical context: prolonged in renal impairment, leading to accumulation. |
| Protein binding | Iodide minimally bound (<5%) to plasma proteins; free iodine not protein-bound. |
| Volume of Distribution | Iodide Vd approximately 0.3 L/kg (distribution to extracellular fluid and thyroid); thyroid uptake may concentrate iodide >100-fold. |
| Bioavailability | Topical: Not applicable (local action); oral: minimal absorption of intact povidone-iodine; absorbed iodine from mucosal surfaces highly variable (up to 20% systemic availability). |
| Onset of Action | Topical: Within 30 seconds to 1 minute for bactericidal effect; mucosal antiseptic effect: immediate upon contact. |
| Duration of Action | Topical: Prolonged with sustained release of free iodine (up to 6–8 hours with formulations like povidone-iodine cream); single application: 1–2 hours depending on organic load. |
| Action Class | Antiseptics and disinfectants |
| Brand Substitutes | Povidine 5% Solution, Intadine Solution, Zylo-P 5% Solution, Drez 5% Solution, Betaseptic 5% Solution |
Povidone-iodine is a topical antiseptic; no systemic dosing. For skin preparation: apply 10% solution to intact skin and allow to dry for 1-2 minutes. For surgical hand scrub: 7.5% or 10% solution, scrub for 5 minutes. For oral rinse: 1% solution, 10 mL swish for 30 seconds, repeat every 4 hours as needed.
| Dosage form | SOLUTION |
| Renal impairment | No dose adjustment required for topical use, as systemic absorption is negligible. For oral rinse, minimal systemic absorption, no adjustment needed. |
| Liver impairment | No dose adjustment required for topical or oral rinse use due to negligible systemic absorption. |
| Pediatric use | Topical: Same as adult for skin antisepsis; use with caution in neonates due to risk of iodine absorption and thyroid suppression. Oral rinse: For children >6 years, same as adult; for <6 years, not recommended due to risk of swallowing. |
| Geriatric use | No specific adjustment required for topical use. For oral rinse, same as adult; monitor for thyroid function if used repeatedly on damaged skin or mucosa. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for POVIDONE IODINE (POVIDONE IODINE).
| Breastfeeding | Reports indicate povidone-iodine is minimally absorbed through intact skin, but in breastfeeding, avoid application to the breast. Iodine can be concentrated in breast milk, potentially causing infant hypothyroidism. M/P ratio not established. Alternative antiseptics preferred during lactation. |
| Teratogenic Risk | Povidone-iodine is classified as FDA Pregnancy Category D. First trimester: Avoid routine use due to potential iodine-induced fetal hypothyroidism and goiter. Second and third trimesters: Use with caution; prolonged or repeated topical application may cause fetal thyroid dysfunction. Systemic absorption can lead to transient neonatal hypothyroidism. |
■ FDA Black Box Warning
None.
| Serious Effects |
["Hypersensitivity to iodine or povidone","Dermatitis herpetiformis","Hypocomplementemic urticarial vasculitis","Patients with known iodine hypersensitivity (rare) – relative contraindication"]
| Precautions | ["Prolonged use may cause skin irritation, sensitization, or burns, especially in patients with extensive burns or wounds.","Absorption of iodine can be significant in neonates, infants, and patients with extensive burns, potentially causing thyroid dysfunction (hypothyroidism or hyperthyroidism).","Use with caution in patients with pre-existing thyroid disorders or those receiving lithium therapy.","Avoid use on large areas of damaged skin, especially in renal impairment, due to risk of iodine absorption and acidosis.","Discontinue if signs of irritation or hypersensitivity occur.","Not for use in deep wounds or puncture wounds due to potential tissue damage."] |
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| Fetal Monitoring | Monitor for maternal signs of iodine toxicity (metallic taste, salivary gland swelling, dermatitis). In prolonged therapy, assess fetal/neonatal thyroid function (TSH, T4) at birth. Avoid use in pregnant women with known thyroid disease. |
| Fertility Effects | No direct impact on fertility documented. Iodine toxicity, however, may cause hypothyroidism which can impair fertility in both sexes. |