I have known people to confuse the beliefs of Christian Science with those of Scientology in regards to medicine. Christian Scientists believe that prayer can heal and so they generally choose it first when someone gets ill (See the Christian Science FAQs for full and accurate data).
In Scientology we recognize that the body is real and that it sometimes gets sick or damaged, so the first action to take is to get the appropriate physical treatment for the condition. For example, if you break an arm then you go to the emergency room and get it attended too.
Once the physical side is under control then any spiritual issues associated with the condition can be addressed. We have spiritual technology called "Scientology Assists" which can help a person recover quicker.
In my own personal experience I have found these assists to be extremely effective. For example, after my wife had a serious operation, I gave her a lot of assists, which helped her get off heavy pain killers and onto much milder medication in a matter of hours instead of days.
If you hear any other data about Scientologists and medicine, then the person giving you the data is misinformed.
For more info check out the Scientology FAQ article: Do Scientologists use medical doctors? and an article on the "Scientology and Me" blog with the same title: Do Scientologists use medical doctors?.