An antimicrobial composition for coating a medical device. The antimicrobial composition includes a polymeric film forming material and an antimicrobial agent comprising a material selected from the group of extract of Houttuynia cordata, sodium houttuyfonate, sodium new houttuyfonate and mixtures thereof. A medical device having an antimicrobial composition that includes a material selected from the group of extract of Houttuynia cordata, sodium houttuyfonate, sodium new houttuyfonate and mixtures thereof and a method for making same are also provided.一種用於塗覆醫療裝置的抗微生物組成物。該抗微生物組成物包括一聚合成膜材料及一包含選自魚腥草萃取物、魚腥草素鈉和新魚腥草素鈉及其混合物之物質的抗微生物劑。一種具有包括選自魚腥草萃取物、魚腥草素鈉和新魚腥草素鈉及其混合物物質之抗微生物組成物的醫療裝置以及亦提供製造其之方法。