Silver sulfadiazine

Silver sulfadiazine is an antibacterial used as an ingredient in skin creams to stop infection of burns. However, its effectiveness is under serious review, although it's listed on the World Health Organization's list of essential medicines.
It does have manageable side effects, including a short-lived burning sensation when first applied. However, as it's not very water soluble, it doesn't penetrate the skin and as such poses no risk of toxicity.
Silver sulfadiazine at Wikipedia
Category:Pharmaceuticals