Laxative, Bulk-forming (By mouth)

Treats constipation by helping you have a bowel movement.

Brand Name(s):

Benefiber, Bulk-K, Carlson Psyllium, Citrucel, Citrucel Fiber Shake, Citrucel with Smartfiber, Equalactin, Evac, Fiber, Fiber Choice, Fiber Choice Plus Calcium, Fiber Choice Weight Management, Fiber Ease, Fiber Laxative, Fiber Therapy

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have ever had an allergic reaction to any bulk-forming laxative. You should not use if you have intestinal blockage, severe stomach pain or fever, or rectal bleeding that you don't know the cause of.

How to Use This Medicine:

Liquid, Powder, Granule, Tablet, Chewable Tablet, Delayed Release Tablet, Capsule, Packet, Wafer

Your doctor will tell you how much medicine to use. Do not use more than directed.
Follow the instructions on the medicine label if you are using this medicine without a prescription.
Take each dose with at least 8 ounces (1 cup) of water. You could choke if you do not drink enough water when you take this medicine. Drink at least 6 to 8 full glasses of liquid every day to help soften your stools (bowel movements).
Mix the powder or granules with at least 8 ounces (1 cup) of water or other liquid. Drink this mixture right away. Do not mix with carbonated beverages, such as soda pop or club soda. Read the directions on the package label if you want to use a liquid other than water, because you can use different liquids for different brands of laxatives. Do not swallow the powder or granules dry.
Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup. You might need to shake the oral liquid before measuring your dose.
Do not chew, crush, or break the delayed-release tablet.

If a dose is missed:

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.

How to Store and Dispose of This Medicine:

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Do not freeze the oral liquid.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.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.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Make sure your doctor knows if you are also using tetracycline, a blood thinner (Coumadin®), digitalis (Lanoxin®), or salicylates (aspirin).

Warnings While Using This Medicine:

Check with your doctor before using if you are pregnant, or if you have diabetes, high blood pressure, heart disease, or trouble swallowing.
This medicine might contain phenylalanine (aspartame). This is only a concern if you have a disorder called phenylketonuria (a problem with amino acids). Talk to your doctor before using this medicine.
Laxatives should not be given to children under 6 years of age unless ordered by a doctor.
Check with your doctor if you have sudden changes in bowel habits that last for more than 2 weeks.
You should not use this laxative for longer than 1 week unless approved by your doctor. Laxatives may be habit-forming and can harm your bowels if you use them too long.

Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

Skin rash
Itchy skin
Trouble breathing
Severe constipation or abdominal pain
Trouble swallowing

If you notice these less serious side effects, talk with your doctor:

Loose stools

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088

Last Updated: 1/27/2017