What is Gavilax: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Gavilax overview

BRAND NAMES:

  • Vita Health Polyethylene Glycol 3350, Sunmark Clearmax, Equate ClearLax, GaviLAX, Good Neighbor Pharmacy Clear Lax, Good Sense ClearLax, Health Mart Clearlax, Healthylax Polyethylene Glycol 3350, Leader ClearLax, MiraLAX, Purelax, Sunmark Clearmax, TopCare ClearLax, Vita Health Polyethylene Glycol 3350, TopCare ClearLax, Equate ClearLax, GaviLAX, GaviLyte-C with Flavor Pack, GaviLyte-G with Flavor Pack, GaviLyte-N with Flavor Pack, Generlac, Gialax, Golytely, Good Neighbor Pharmacy Clear Lax, Good Neighbor Pharmacy Magnesium Citrate, Good Sense ClearLax, GoodSense magnesium citrate, Citroma, Constulose, Enulose

Generic Names:

  • Polyethylene Glycol 3350

Uses:

  • Treats constipation by helping you have a bowel movement. Sometimes used to empty your bowel before surgery or other medical procedures., Treats occasional constipation.

Therapeutic Classes:

  • Laxative, Hyperosmotic, Antacid, Magnesium Containing, Antidote, Gastrointestinal Agent, Laxative, Hyperosmotic, Magnesium Supplement, Phosphate Supplement, Renal-Urologic Agent

Forms:

  • Tablet, Powder for Suspension, Capsule, Liquid, Powder for Solution, Packet, Powder, Liquid, Packet

How it’s taken:

  • By mouth, By mouth

What is Gavilax used for?

MiraLax is an osmotic laxative that is used to treat occasional constipation or irregular bowel movements. MiraLax works by holding water within the colon to soften the stool and increasing the number of bowel movements to relieve constipation. This drug is available as an over the counter medication and as a prescription.

What form(s) does Gavilax come in

  • Tablet

  • Powder for Suspension

  • Capsule

  • Liquid

  • Powder for Solution

  • Packet

  • Powder

  • Liquid

  • Packet

What are common Gavilax doses?

  • Bottle 238GM of 17GM/SCOOP

  • Bottle 510GM of 17GM/SCOOP

How to take Gavilax

  • Your doctor will tell you how much of this medicine to take and how often. Do not take more medicine or take it more often than your doctor tells you to. This medicine is not for long-term use.

  • Always dissolve the powder in a full glass (8 ounces) of water, juice, soda, coffee, or tea before swallowing it. If you need to measure your medicine, use a marked measuring cup or spoon.

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

  • It may take 2 days or longer for this medicine to help you have a bowel movement.

  • It may take 2 days or longer for this medicine to help you have a bowel movement.

  • Your doctor will tell you how much of this medicine to take and how often. Do not take more medicine or take it more often than your doctor tells you to. This medicine is not for long-term use.

  • Always dissolve the powder in a full glass (8 ounces) of water, juice, soda, coffee, or tea before swallowing it. If you need to measure your medicine, use a marked measuring cup or spoon.

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup. You might need to mix the liquid with at least 4 ounces (1/2 cup) of water before you drink it.

  • You will need to mix the powder or the contents of the packet with water before using it. Most powders must be mixed with at least 4 ounces (1/2 cup) of water. Make sure you understand how much water to mix the medicine with. Drink the mixture right after you mix it.

  • If you using this medicine to empty your bowel before surgery or medical tests, follow your health caregiver's instructions about when to use this medicine. It is important to follow the correct schedule.

  • Drink a full glass of water when you take this medicine, unless your health caregiver tells you otherwise. One full glass of water is about 8 ounces or 1 cup. Most people should drink 6 to 8 full glasses of water every day. Doing this will help soften your bowel movements, making them easier to pass.

  • You will need to mix the powder or the contents of the packet with water before using it. Most powders must be mixed with at least 4 ounces (1/2 cup) of water. Make sure you understand how much water to mix the medicine with. Drink the mixture right after you mix it.

  • If you using this medicine to empty your bowel before surgery or medical tests, follow your health caregiver's instructions about when to use this medicine. It is important to follow the correct schedule.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup. You might need to mix the liquid with at least 4 ounces (1/2 cup) of water before you drink it.

  • Drink a full glass of water when you take this medicine, unless your health caregiver tells you otherwise. One full glass of water is about 8 ounces or 1 cup. Most people should drink 6 to 8 full glasses of water every day. Doing this will help soften your bowel movements, making them easier to pass.

What to do if you miss a dose of Gavilax

  • Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

  • If you miss a dose or forget to take your medicine, take it as soon as you can. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose.

  • Do not use extra medicine to make up for a missed dose.

Gavilax contraindications

  • You should not use this medicine if you have had an allergic reaction to polyethylene glycol, or if you have signs of a bowel obstruction (nausea, vomiting, stomach pain or bloating).

  • You should not use this medicine if you have had an allergic reaction to lactulose, polyethylene glycol, sorbitol, magnesium, or sodium phosphate. Make sure your doctor knows if you are allergic to any other laxative medicines. You should not use this medicine if you have a blockage in your intestines. Tell your doctor if you cannot have lactose, or if you have other digestive problems. Also tell your doctor if you have kidney disease or congestive heart failure (CHF).

Gavilax warnings

  • Make sure your doctor knows if you are pregnant or breastfeeding.

  • Do not use this medicine longer than 2 weeks unless your doctor has told you to.

  • If you do not have a bowel movement after using this medicine, talk to your doctor. The amount of time before you should have a bowel movement depends on the type of laxative you are using. Some laxatives might cause a bowel movement in 30 minutes, and other laxatives could take as long as 48 hours (2 days).

  • Make sure your doctor knows if you are pregnant or breast feeding, or if you have diabetes or heart disease. Tell your doctor if you have trouble with magnesium, potassium, calcium, or sodium (salt) levels in your blood.

  • Tell any doctor or dentist who treats you that you are using this medicine. You may need to stop using this medicine several days before you have surgery or medical tests.

  • If you are using this medicine for a long time, your doctor may need to check your blood at regular visits. Be sure to keep all appointments.

  • Some kinds of laxatives are not for long-term use. Other laxatives might be used over a long time period. Ask your doctor how long it is safe to use this laxative.

Gavilax interactions

  • Make sure your doctor knows if you are using any other medicine for digestion problems, such as an antacid, or any medicine for your heart.

  • If you do not have a bowel movement after using this medicine, talk to your doctor. The amount of time before you should have a bowel movement depends on the type of laxative you are using. Some laxatives might cause a bowel movement in 30 minutes, and other laxatives could take as long as 48 hours (2 days).

  • Tell any doctor or dentist who treats you that you are using this medicine. You may need to stop using this medicine several days before you have surgery or medical tests.

  • Some kinds of laxatives are not for long-term use. Other laxatives might be used over a long time period. Ask your doctor how long it is safe to use this laxative.

  • If you are using this medicine for a long time, your doctor may need to check your blood at regular visits. Be sure to keep all appointments.

  • Make sure your doctor knows if you are pregnant or breastfeeding.

  • Do not use this medicine longer than 2 weeks unless your doctor has told you to.

Gavilax side effects

Serious Side Effects

  • Bleeding from your rectum.

  • Severe stomach pain, bloating, vomiting, or diarrhea.

  • Confusion, weakness, and muscle twitching.

  • Dry mouth, increased thirst, muscle cramps, severe nausea or vomiting.

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Severe stomach pain, bloating, vomiting, or diarrhea.

  • Allergic reaction: Itching or hives, swelling in face or hands, swelling or tingling in the mouth or throat, tightness in chest, trouble breathing.

Less Serious Side Effects

  • Mild cramps, bloating, diarrhea, or gas.

  • Mild stomach pain, cramps, gas, nausea, vomiting.

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