Sorbitol when taken orally at the maximum recommended dose (150 mL) on an empty stomach will usually produce uncontrolled evacuation within 30-45 minutes. There will be some minor flatulence for about 5 minutes before stooling starts. The stool will be loose to the extreme initially.
About 90 to 100 minutes following oral administration the typical result is rapidly recurring stool that is like dark colored water. It is often described as being like the result of a second or third water and glycerin enema, with no sensation of solids.
90 minutes in, you will usually be remaining on the toilet as wave after wave of large amounts of fluid are passed. Plan on sudden urges to evacuate for up to six hours. In the last couple of hours of laxation, flatulence will be frequent, but attempts at differentiating between flatulence and liquid often ends in catastrophic results.
The recommended sorbitol enema dosage (approximately 35 ml of sorbitol liquid mixed with 85 ml of water), if used, should be followed closely. Adding more sorbitol liquid laxative to the solution than recommended or using a larger volume than recommended will frequently prevent administration of but a fraction of the solution due to over reaction of the colon.
For reference the stock Fleet enema is 133 mL. When sorbitol laxative 70% W/W is mixed at the recommended ratio of 2.3 parts water to 1 part sorbitol liquid, the solution is only about 30% sorbitol liquid. Administer the enema with the person on their left side and preferably with the hips and legs elevated two to three inches above the head. If retained for 45 to 60 minutes, the typical response is a sudden, rapid, massive bowel movement. The voluminous amount of liquid in the stool often results in widespread soiling of linen, floors, the person and those caring for the recipient. Do not scrimp on Chux and absorbent padding. The result can be described as aerosol like and like the oral dose, it reaches a point where the person cannot control the laxation.
With either oral or rectal administration, use of disposable diapers is prudent, given the laxative's sudden onset and the production of massive amounts of stool and liquid at the very beginning.