Basically they mean the same thing

What is the difference between"every two days" and "every second day"? "every two days" ->It would be clearer to say: "every after two days". ->e.g.: Drink this medicine every after two days. "every second day" ->Randy is right. Every second day of what? week? month? year? ->e.g.: the 2nd day of the week is Tuesday, the 2nd day of November is Nov. 2, and the 2nd day of the year is January 2. Hope that helps (^_^)/

Normally the expressions would be equivalent, but you have to be careful. Every second day? Every second day of what? Every second day of the week?

Hi, Sunflower, Here in America we say "every other day ". Thank you!