Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
Quick facts
- How it is given
- oral
- Type
- human otc drug
- Brand names
- FIBER THERAPY
- RxNorm ID
- 1868843
We do not publish dosing. How much of this medicine to take, how often, and for how long depends on your age, weight, kidney and liver function, other conditions and other medicines. That is a decision for the person who prescribes or dispenses it. Follow the directions on your own pack and ask your pharmacist if anything is unclear.
What it is used to treat
Uses • relieves constipation (irregularity) • helps to restore and maintain regularity • for treating bowel disorders when recommended by a doctor • generally provide effect in 12-72 hours
Warnings
Warnings CHOKING: taking this product without adequate fluid may cause it to swell and block your throat or esophagus and may cause choking. Do not take this product if you have difficulty in swallowing. If you experience chest pain, vomiting, or difficulty in swallowing or breathing after taking this product, seek immediate medical attention. Ask a doctor before use if you have • abdominal pain, nausea or vomiting • a sudden change in bowel habits that persists over a period of 2 weeks • sensitivity to any of the ingredients Stop use and ask a doctor if • you have rectal bleeding • you fail to have a bowl movement after use. • These could be signs of a serious condition. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away at 1-800-222-1222. When using this product • do not exceed recommended maximum daily dose unless directed by a doctor • do not use laxative products for a period longer than one week unless directed by a doctor
Ask a doctor or pharmacist before use if
Ask a doctor before use if you have • abdominal pain, nausea or vomiting • a sudden change in bowel habits that persists over a period of 2 weeks • sensitivity to any of the ingredients
Stop use and see a doctor if
Stop use and ask a doctor if • you have rectal bleeding • you fail to have a bowl movement after use. • These could be signs of a serious condition.
Keeping it away from children
Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away at 1-800-222-1222.
Active ingredient
Active ingredient (in each 19g adult dose/ rounded tablespoon) Methylcellulose 2g (a non-allergenic fiber)
Other ingredients
Inactive ingredients citric acid, FD&C yellow 6 aluminum lake, maltodextrin, flavor (natural and artificial), potassium citrate, silica, sucrose,
Before you take anything new
Tell your pharmacist or doctor about every medicine you take — including ones bought without a prescription, herbal products and supplements. Interactions are one of the most common avoidable causes of harm from medicines, and a pharmacist can check your full list in a couple of minutes.
This page is built from the openFDA record of the U.S. Food and Drug Administration's approved labelling for this product, effective 16 April 2026. Label text has been shortened and reformatted for readability; safety wording has not been altered in meaning. FDA labelling describes products approved in the United States — brand names, strengths, formulations and approved uses may differ in your country. Always read the leaflet that comes with your own pack. PocketsInfo is not affiliated with, and is not endorsed by, the FDA. Retrieved 2026-07-30.