Moviprep generally starts to work within up to two hours after drinking it. The typical guidance is to drink the Moviprep solution over 1 to 2 hours, and then allow about 2 hours for it to produce watery bowel movements. The effect continues as the bowel is cleared, often with multiple bowel movements over 1-2 hours or more. Details:

• After finishing the Moviprep solution, watery diarrhoea and bowel clearing usually begin within 30 minutes to 2 hours.
• It is important to stay near a toilet during this time as frequent bowel movements occur.
• The bowel prep process from starting to drink the solution to the bowel being adequately cleared usually takes about 3 to 4 hours total, depending on the dose timing.
• Two doses are usually taken (e.g., evening before and morning of the procedure), each followed by a similar time frame for the Moviprep to work.

Therefore, each dose takes about 1-2 hours to drink and then about 2 hours for the effects to begin and continue, with the bowel becoming fully prepared typically within a few hours after the second dose is completed.