It should not be a problem so as long you fulfill the requirements by the time you matriculate for medical school.
I have seen friends do it and have no problem succeeding in their respective courses. However, I have seen other complain about having to go back over their lecture notes from either the previous semester or year in order to understand what they are doing for the coming week's lab. So, it should not be looked at negatively. Like I said, however, you may feel a little bit incovenienced having to read up on your lecture notes to know and understand what you are doing.