Drinking Instructions

Whether it’s a minor procedure, major surgery or colonoscopy prep, ClearFast is here for you. Find out when you should drink your bottles of ClearFast with the drinking instructions below.

Find out when to drink each bottle

1. From the list below, select the calculator that best fits your procedure
2. Enter the time your procedure is scheduled for
3. Email the schedule to yourself for easy reference

Two bottles (Minor Procedures)


Three bottles (Traditional Enhanced Recovery Program)




ClearFast PreOpmeets the ASAfasting guidelines for clear liquids up to 2 hours before surgery.