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HalfLytely and Bisacodyl Tablets

HalfLytely and Bisacodyl Tablets Patient Information Including Side Effects

Brand Names: Half Lytely and Bisacodyl Lemon Lime, HalfLytely and Bisacodyl, HalfLytely and Bisacodyl with Flavor Packs

Generic Name: bisacodyl and polyethylene glycol (PEG) 3350 with electrolytes (Pronunciation: bis a KOE dil and pol ee ETH il een GLYE kol)

What is bisacodyl and PEG-3350 (HalfLytely and Bisacodyl Tablets)?

Bisacodyl and PEG-3350 is a laxative that stimulates bowel movements. This medication also contains potassium, sodium, and other minerals to replace electrolytes that are passed from the body in the stool.

Bisacodyl and PEG-3350 is used to clean the bowel before colonoscopy or other intestinal procedure.

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

What are the possible side effects of bisacodyl and PEG-3350 (HalfLytely and Bisacodyl Tablets)?

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

Call your doctor if you have any of these serious side effects:

  • seizure (convulsions);
  • severe nausea, severe stomach pain or bloating;
  • coughing up blood or vomit that looks like coffee grounds;
  • rectal bleeding;
  • no bowel movement within 6 hours after use; or
  • gagging, choking, or vomiting.

Some of these side effects may be prevented by drinking the medication more slowly, or not using it for a short time. Follow your doctor's instructions.

Less serious side effects may include:

  • mild nausea or vomiting;
  • mild stomach cramps, or full feeling;
  • rectal pain or irritation;
  • passing gas; or
  • headache.

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.

Read the HalfLytely and Bisacodyl Tablets (sodium chloride-sodium bicarbonate and potassium chloride) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about bisacodyl and PEG-3350 (HalfLytely and Bisacodyl Tablets)?

On the day of your colonoscopy or bowel exam, do not eat solid food or drink anything other than clear liquids. Avoid drinking large amounts of water after taking this medication. You may be instructed not to drink or eat anything before your medical test or procedure. Follow your doctor's instructions about the type and amount of liquids you should drink for at least 24 hours before and after your test or procedure.

Avoid taking antacids within 1 hour before you take the bisacodyl tablets.

Do not use other laxatives while using bisacodyl and PEG-3350 unless your doctor has told you to.

Talk to your doctor if you cannot drink all of the medication prescribed for you. Your test or procedure may need to be rescheduled if your bowel is not completely cleansed.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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