One can usually anticipate feeling more peaceful, lighter, cleaner, and more energized after a colonic.  On some occasions, if there has been a long standing condition of constipation or several health problems, a “cleansing reaction” could occur as toxins are trying to be released from the body.  This can manifest as headaches, fatigue, nausea, gas and bloating, and just a general feeling of illness.  If this is so, a short rest will help restore one's equilibrium.  It may take a few visits for these reactions to subside.

 Also, it should be known that since the colon has been, in most cases, cleared of most day-to-day solid matter during a colonic, it may take one or two days before it fills up again and normal bowel movements are resumed.  Again, this is a natural and necessary process that allows the therapist eventually to get down to the deeper layers and pockets in the colon.

Since some water is absorbed through the colon wall during a colonic, and one may notice an increased need to urinate for a few hours afterwards.  This beneficial effect of flushing the kidneys may also be enhanced by drinking a few glasses of water with the juice of half a lemon added to each glass.

 A colonic has a profound cleansing effect on the body, and many people feel so good afterwards that they want to double their jogging or work-out time.  Caution is advised here, for it can be overdone.  Although light to moderate exercise is good if you are used to it, any strenuous activity should be avoided that day.

 A light diet of fruits, vegetables, salads, soup, and chicken or fish should be followed for two days, taking care to avoid anything that causes gas.  Rich or heavy food, flour products, spices, and alcohol should also be omitted.  Although irrigating the colon does not remove all of the intestinal bacteria, it is still often helpful to take some form of acidophilus to maintain bacterial balance.  In addition, Cayce advised yogurt because it is an active cleanser that also adds vital forces to the colon.