How would oral medication be given to patient in ICU that can't swallow? I was told that the tablets are grind and put in water then provided through a tube. Is this true? How would the nurse know the effect of interaction resulting from mixing those ground pills? Thanks.
Through a nasogastric tube. What you call "interaction" would be previously known by general and common knowledge of pharmacology. The doctor must know about those interactions, the nurse simply administrates what was indicated
After some research I found this topic which answers part of my question. It does not answer the chemical effects of mixing drugs outside the human body.
2-drug-administration-via-a-nasogastric-tube. (may require subscription!)
I find the process of grinding different pills and serving them altogether strange I am almost sure that this can't be generally correct.