What is your current method of administration and size of dosage?
One simple method I would suggest is
concentrating the liquids so that it enters your system more efficiently and in smaller doses. Essentially, you would be isolating the compounds necessary for what you desire. I do not know how much spitting the rest out would affect you; it kinda depends on the rate of absorption into your blood stream. If you do opt for concentrating the liquids and your current dosage had been working fine, you will have to reduce your new dosage proportionally.
A simple way of solving this would be to set up a system of proportions:
Current dose New dose
--------------- = -------------- Then, solve for the new dose value.
Original brew Concentrate
The key to making the compounds work is that they get into your blood stream.
Since you have trouble with taking some herbs orally, making a poultice or your own
aroma therapy are alternatives to oral medication; albeit, they would be slower to act.
Here is a
video from YouTube about poultices: