How many mg is to much morphine for a 162 lb person?

How many mg is to much morphine for a 162 lb person?
It depends upon the person. People can build up tremendous tolerances over periods of time with gradual increases in dosages.There is no set number. You could look at a PDR (physician's desk reference) at the library and read up on it or ask a pharmacist or doctor.
Ask your doctor or the doctor of the patient you are helping to care for.