It sounds as though your father is suffering from advanced liver disease and that the doctors are doing all they can to help him. The lactulose is supposed to help remove the excess ammonia from his system that is causing the brain encephalopathy. From what I could judge from my readings on these things your father is quite ill. There is not a lot that you can do to supplement other than what the doctors are doing.
The only thing that I found that might help a bit was to put him on a vegetarian diet but that is controversial. It is thought that the lowered protein in the veg diet might
help lower the ammonia levels faster... but if he's been eating meat all of his life he might not take kindly to a veggie diet at this point. I found a very informative article that discusses treatments for hepatic encephalopathy. This may help your understanding of your father's illness and treatments.Encephalopathy and Liver Disease/Hepatitis
You may want to have a short conference with his GI & liver docs and ask them straight out about
your father's prognosis and chances for healing. Although the truth may be not what you want to hear, there comes a point in the progress of some diseases where you have to help a person be comfortable and happy and stop expecting them to get better. Your father may have reached this point. I hope and pray not, but it's better to get the real picture so you can plan, than to be hoping against insurmountable odds.
I will remember all of you in my prayers.
~ Jeannie, Forum Moderator/Diabetes & FibromyalgiaI know God will not give me anything I can't handle. I just wish that He didn't trust me so much. ~Mother Teresa "People are like stained glass windows: They sparkle and shine when the sun's out, but when the darkness sets in, their true beauty is revealed only if there is light within."- Elizabeth Kubler-Ross