One can think also to use directly the seeds, instead of the juice of the plant.
Seed pods
The dried seed pods can be cooked in boiling water for 15-20 minutes.
The fresh seedpods can also be placed in a sealable jar. Fill the jar with fresh seed pods and give rum over the seed pods until it covers all of them. Keep the sealed jar in a warm place for 6 months. Then press the remaining liquid out of the seed pods and throw them away. One shooter of this liquor can create opiumlike effects.