Some juices interfere with medications
http://www.hc-sc.gc.ca/english/iyh/food/grapefruit.html
Consuming grapefruit or its juice (fresh or frozen) can increase, or less
commonly decrease, the effects of some drugs. There are several substances in
grapefruit that interfere with the way your body handles certain drugs.

These effects are known to be caused by the combination of grapefruit and its
juice with certain drugs and health products used in the treatment of medical
conditions, including, but not limited to:

Angina
Anxiety
Cancer
Convulsions
Depression
Erectile dysfunction
Gastrointestinal reflux
High blood pressure
High lipid (cholesterol) levels
HIV/AIDS
Infections
Irregular heart rhythms
Organ graft rejections
Psychotic problems
Sour oranges, such as Seville, or their juice, may have an effect similar to
grapefruit juice. Most other citrus fruits, such as lemons, limes, citrons,
naturally sweet oranges and tangerines are not thought to have this effect.
However, tangellos, a hybrid of grapefruit, may also interfere with drugs

Note: estrogen
http://www.dartmouth.edu/dms/news/publications/dartmed/fall00/html/bench_to_beds
ide.shtml

Interactions: In the late 1990s, researchers began to discover that grapefruit
juice altered the effectiveness of other drugs, too. Ingesting as little as 200
to 250 ml (about a cup) of grapefruit juice--or just two grapefruit
segments--before taking certain oral medications could increase the systemic
blood concentrations of those drugs from 30% to 900%. So far, the medications
known to interact with grapefruit juice include immunosuppressant drugs (such as
cyclosporine); calcium channel blockers (felodipine, amlodipine, verapamil,
nifedipine, nisoldipine), which are used to treat blood pressure or angina; many
sedatives and anxiolytics (midazolam, triazolam, alprazolam); certain hormones
(estrogens and corticosteroids); antihistamines (astemizole and terfenadine, the
latter now unavailable in the United States); certain antiseizure drugs
(carbamazepine); many of the statin drugs (atorvastatin, simvastatin,
lovastatin), which are used to lower blood lipids; and certain drugs used to
treat AIDS (the protease inhibitors ritonavir, saquinivir, and indinavir). Other
drugs are continually being added to this list.

And coffee enemas
http://swiftweb.com/ha/enema.html
Dr. Max Gerson used this clinically as part of a general detoxification regimen,
first for tuberculosis, then cancer. Caffeine, he postulated, will travel up the
hemorrhoidal to the portal vein and thence to the liver itself. Gerson noted some
remarkable effects of this procedure. For instance, patients could dispense with
all pain-killers once on the enemas. Many people have noted the paradoxical
calming effect of coffee enemas. And while coffee enemas can relieve
constipation, Gerson cautioned:

"Patients have to know that the coffee enemas are not given for the function of
the intestines but for the stimulation of the liver."

You'll have to read the rest of these web pages and see what else they say about
such.
It's too complicated (for me, other than the known juices to avoid)
J