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GaviLyte-H and Bisacodyl with Flavor Packs

Generic name: bisacodyl and polyethylene glycol (PEG-3350) with electrolytes [ bis-a-KOE-dil-and-pol-ee-ETH-il-een-GLYE-kol ]
Brand name: GaviLyte-H and Bisacodyl with Flavor Packs
Drug class: Laxatives

Medically reviewed by on Aug 16, 2023. Written by Cerner Multum.

What is bisacodyl and PEG-3350?

Bisacodyl and PEG-3350 is a laxative that is used to clean the bowel before a colonoscopy.

Bisacodyl and PEG-3350 may also be used for purposes not listed in this medication guide.

Bisacodyl and PEG-3350 side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Bisacodyl and PEG-3350 may cause serious side effects. Stop using bisacodyl and PEG-3350 and call your doctor at once if you have:

Tell your doctor right away if you have trouble drinking clear liquid.

Common side effects of GaviLyte-H and Bisacodyl with Flavor Packs may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Use only as directed. Tell your doctor if you use other medicines or have other medical conditions or allergies.

Before taking this medicine

You should not use GaviLyte-H and Bisacodyl with Flavor Packs if you have:

Tell your doctor if you have ever had:

Tell your doctor if you are pregnant or breastfeeding.

Not approved for use by anyone younger than 18 years old.

How should I take bisacodyl and PEG-3350?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.

Drink plenty of water before, during, and after your bowel cleanse. You may get dehydrated easily while using bisacodyl and PEG-3350.

This medicine contains a bisacodyl tablet and also a PEG-3350 powder to mix into a solution. You will take the tablet first and then drink the solution once you begin having bowel movements.

Prepare the solution as follows:

Swallow each tablet whole and do not crush, chew, or break it. Take with a full glass of water.

After taking the tablets you should have a bowel movement within 1 to 6 hours.

Once you have a bowel movement, drink 8 ounces of the solution every 10 minutes. Drink each portion as quickly as possible rather than sipping it slowly.

If you have severe stomach discomfort, stop drinking the solution or drink it more slowly at longer intervals.

Watery bowel movements should begin within 1 hour after you start drinking the solution.

Call your doctor if you cannot drink all of the solution as prescribed in time for your colonoscopy. The test may need to be rescheduled.

Be sure to finish the entire 2 liters of solution, following the schedule your doctor recommends.

On the day of your colonoscopy, do not eat solid food or drink anything other than clear liquids.

Follow your doctor's instructions about the type and amount of liquids you should drink for at least 24 hours before and after your colonoscopy.

Store unopened bisacodyl and PEG-3350 at room temperature, away from moisture and heat.

What happens if I miss a dose?

Call your doctor if you can't drink all of the solution at the scheduled times.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking bisacodyl and PEG-3350?

Do not use other laxatives.

Avoid taking an antacid within 1 hour before or after you take the bisacodyl tablet.

Avoid taking other medicines, vitamins, or mineral supplements within 1 hour before you start drinking the solution. Your body will not properly absorb medications you take during this time.

What other drugs will affect bisacodyl and PEG-3350?

Tell your doctor about all your other medicines, especially:

This list is not complete. Other drugs may affect bisacodyl and PEG-3350, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

More about bisacodyl / polyethylene glycol 3350 / potassium chloride / sodium bicarbonate / sodium chloride

Patient resources

Other brands

HalfLytely and Bisacodyl

Related treatment guides

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.