Pain from chemotherapy

Kinnari Shah My friend’s father is diagnosed with Stage 3 blood cancer and is currently taking chemotherapy. He is going through lots of pain and chemotherapy is not much helping him. Is there any mantra or switch word for him to get relief and/or to help with chemotherapy? As he will not able to chant for he is too weak, but his daughter (i.e. my friend) will chant or do whatever you suggest for him.

Naran Chant “HARI OM” as many times as possible. In addition, chant “HARI OM” over a glass of water and give that water to him with the help of a spoon.