If you can't finish the bowel prep, let the doctor's office know. Better to cancel and reschedule the appointment than to have an incomplete colonoscopy because your colon wasn't empty.

Do I have to drink the whole colonoscopy preparation?

Do I still need to take the rest of the prep? Yes. You must drink all the prep to fully clean out your colon for a safe and complete colonoscopy. I feel like throwing up (nausea) or did throw up (vomit) after taking the bowel prep.

What if I can't finish the second bottle of Suprep?

by Drugs.com

Still take the second dose at 10pm. If you start to feel nauseous take a break of around half an hour in between sips. A ginger hard candy or lemon slice may be helpful. Some find drinking it cold and through a straw helpful, and others mix it with a sports drink or powdered drinks mix.