I think tai may be asking about using retirement funds to pay for med school, not just regular savings. Unless s/he has a six figure bank account just lying around, in which case, um, hi there.
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This is an individual question where the "right" answer will depend on your goals and circumstances. The problem, especially if you're a young nontrad in your 20s, is that you probably don't have much money saved up, and any money you take out of your retirement accounts loses the major advantage you get from allowing it to compound tax-deferred (in a traditional retirement account) or tax-free (in a Roth) over a period of 3-4 decades. Whereas, if you're already in your 40s like I am, and you already have six figures saved up, neither of those issues is as big of a concern. But in that case, you have other concerns, namely a much shorter amount of time to rebuild your next egg/pay off the loans, and less time to give the savings to compound. You will need a much higher savings rate if you start saving for retirement in your 30s or 40s than you will if you start saving in your 20s. Other factors (ex. do you have a spouse who will be working while you're in school to help pay living expenses, kids' college funds/house down payment/other large financial goals to save up for, etc.) can also affect your decision.
I would suggest that if you have't ever sat down with a financial planner to discuss your options that you consider doing this. Look for a fee-only planner, meaning this person will charge only by the hour and will not receive any commissions for selling you anything. Here's a place to start looking for one:
http://www.garrettplanningnetwork.com For the record, I have no affiliation with them and no one in particular that I'm recommending. As I said above, I've decided to invest the time into taking all the CFP courses, so I do my own planning. And my situation is different than most other people's since I have no family and no loans.
I will also say that good, reliable advice is not cheap. But nothing about this med school process is; you're already talking about spending over a third of a million dollars over the next several years. In the interest of being pound wise and not penny wise, it may be worth paying a few hundred or even a few thousand dollars now to set a good financial plan into place for accomplishing this.
Sorry if this seems like a non-answer, but no one can really tell you what you "should" do without knowing all the details of your situation. And there is likely more than one reasonable option you could consider to pay for medical school.