My mother was a devout Christian Scientist, a reader in the church, and ran the reading room for the church in her hometown. I have attended CS churches with her in Seattle, N.Y. and Az.
I was never a member of the church, but through speaking at length about this very issue to my mother and her friends in many states, I can say that yes- the Christian Scientists I met and I have met quite a few, did not take any drugs or medical treatments for illness. They even discouraged my mother from taking vitamins. The church membership I met did actively encourage members to use only the prayers of a C.S. practitioner for medical issues.
My mother would feel horrible guilt when she became ill, because she was sure that manifesting illness proved that you were failing at your prayers.
An interesting aside to any music buffs- Metallica singer James Hetfield wrote the song ‘Until it Sleeps’ about his memories of watching the long and painful death, from untreated cancer, of his Christian Science mother.