Can iodine tincture and mercurochrome be used together?

Under normal circumstances, iodine tincture and mercurochrome solution should not be used together. The detailed explanation is as follows:

Iodine tincture primarily contains iodine, while mercurochrome solution mainly consists of merbromin. When mixed, these two substances undergo a chemical reaction to form mercury(II) iodide. Mercury(II) iodide is toxic and can irritate the skin and mucous membranes. It may also be absorbed into the bloodstream, potentially damaging liver and kidney function, and in severe cases, even causing systemic poisoning. Although both iodine tincture and mercurochrome solution can be used for skin disinfection, their mechanisms of action differ. Combining them does not enhance disinfection efficacy; instead, it produces harmful substances that cause additional harm to the body. Therefore, they must never be used simultaneously.

When treating wounds in daily life, choose only one appropriate antiseptic based on the wound condition. After using iodine tincture for disinfection, alcohol can be applied to remove residual iodine and reduce irritation. Mercurochrome is suitable for minor abrasions, but should not be used by individuals allergic to mercury. For deep or contaminated wounds, surface disinfection alone is insufficient—prompt medical attention is necessary. Store antiseptics out of reach of children, regularly check expiration dates, and ensure safe and effective use.