Ok, another pair
This is the more important one(ime)
https://www.ncbi.nlm.nih.gov/m/pubmed/4054201/
It claims that rectal absorption of morphine was "drastically " effected/improved by PH(adjusting)
It says a PH of 7 to 8 would be efficient
It demonstrates the importance of PH with opiates / opioids in general, and that rectal absorption of morphine is effected, and can presumably be improved, by adjusting it
https://www.ncbi.nlm.nih.gov/m/pubmed/1570227/
The above says rectal mscontin(or something similar) had a Tmax of 5hrs, vs 2.5 for PO, and ~ 70 minutes for rectal suppositories
Could this be added to morphine megathread? Hmm