Not OP but also a stutterer who just started medical school in the UK. I would say that it just depends on you individually and how your stutter is and when it becomes prominent. For me, my sutter increases a lot when I am nervous and so during the weeks leading up to my interviews, I could see an obvious increase in the amount that I stuttered. However, my advice to you when preparing would be that when your practicing for your interview answers, I would go through example questions and answer them. The reason for this is that if you know what you are going to say for certain questions, it will end up being you just having a general conversation with the interviewer and talking about yourself and I found that this helped me to not focus on my stammer and instead just talk almost casually. This did not mean that I did not stammer during my interviews, I certainly did, but I was able to move from it quickly instead of it having a negative impact on my performance. I also want to say, the interviewer themselves may have an impact on this. I do not know in which country you are applying to med school in, but here in the UK, most of my inteviews were in the format of multiple stations meaning I had 5 minutes with different interviewers. In 2 of the 3 universities that had this style of interview, the interviewers were really friendly and gave a healthy amount of eye contact which was really comforting and made the whole interview a lot easier to cope with. However, in one of the interviews, all the interviewers barely gave eye contact and rather than it being a conversation just felt like I was being asked a question and was responding to a brick wall, they did not even seem to be listening. Looking back, this was definitely not the case and was just the style of their interview, but since I was not ready or expecting this, it really put me off and I felt I had messed up from the first minute and it allowed my stammer to really increase. My advice would be to be prepared for any kind of interviewer and regardless of how they respond, just give your points and explain them well and I am sure you will do amazingly. ​ I hope this helped. If you need any other information feel free to ask. :)