My 81 year old grandmother is taking 20 mg of Zocor per day, AS W...

My 81 year old grandmother is taking 20 mg of Zocor per day, AS WELL AS 600mg of Lopid per day. I just read that Zocor and Lopid should NOT be taken together, but the quack of a doctor she's seeing is a real pill pusher, and he hasn't made any attempt and getting her off of this. She began losing muscles last fall after taking the medications for a while, but now she is nearly helpless, and falls and loses her balance a lot. Which medication should be stopped, the Zocor or the Lopid? Both of these medications can cause muscle deterioration. Since she will not be going back to the quack, I was just wondering which one we should take her off of, or possibly both. Thanks for any information.