I wasn't to sure how to try to milk it when i had a patch growing, as the neighbors were always commenting on the odd plants i grew. i scored several stalks on a dry morning, and cut them down the next day. i'm terrible at chemistry and math, so extractions are not a way for me to go. i simply took the stalks, and dried them in my dehydrator.
on their own, they almost tasted like dandelion tea, with passionflower and valerian, i had a really nice calming tea. I didn't measure anything, just tossed dried stems with dried passionflower leaves and valerian root, boiled, and drank. i'd love to try it with skullflower, but all my herbs are now at another location, so i'll have to start over this year.
It is not a strong herb, i hate opiates, as they make me sick, so i was leary. i also read that they were somehow in the nightshade family. IF someone had large quantities of the latex, and could magick up some basic chemistry, there MAY be pain relief... but then again regular old store bought lettuce head cores in large quantities can do the same.
I will say too, that i initially planted 7 plants, let them grow out, and set seed. 3 years later i found it everywhere, and it was rampant. all along my street, it and the passionflower appeared much to my amusement, and kinda horror. good container plant for slightly sedating tea. NOT a good plant to just let loose inone's garden or yard.