Research the schools that offer MD/PHD combo programs. Most of the ivy league schools offer this form of study, such as Princeton who offers this combo degree and others. If you are already attending a university and want to stay at the same one, contact your major department and talk with an advisor about the MD/PHD combo that may be available through your university's graduate or medical school.
Read up about the programs you found to see what is required in each of them. Find out how many credits are needed to complete the combo degree and how long the program will take? Ask about the complete cost of the combo program to determine if it is really worth pursuing. For this combo degree, it will probably pay off if you are planning on staying within that industry.
Narrow the results you found to the top three schools you would like to attend with this combo degree. Visit them, talk with counselors and other students in the MD/PhD combo degree program and see how they are handling the work load involved.
Consider an online or remote education combo degree program. They are being offered by many secondary institutions and the appeal is that you can complete the programs in the comfort of your own home. Make sure to check the validity and transferability of the school before enrolling.