My 92 year old mom , who weighs 78 lbs., has been taking oxycodone 7.5 -325 for 18 mos approx. She s living at our house, and is in hospice.The hospice nurse said she was changing her pain Medes, I m supposed to start her on morphine sulfate 30 mg in the morning, instead of the other Med. After reading all of the things sent with the prescription, I m afraid it might not be safe. Is this stuff e really safe for her to take?