I haven't done a coffee enema for couple of months because I was concerned about raising my blood pressure which is under control, i.e. less than 120/70. But, I just did a quart of coffee for 20 minutes and checked my b.p. several times during the waiting period. It did rise somewhat to about 140/85 max. Possibly part of this was the fact that enemas tend to be stimulating and perhaps somewhat sensual...not the reason that I do them. I enjoy them for the way they make me feel healthy and refreshed. So enjoy!