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Drugs reference index «Chronulac Syrup»

Chronulac Syrup

Generic name: LactuloseBrand names: Chronulac Syrup

Why is Chronulac Syrup prescribed?

Chronulac treats constipation. In people who are chronically constipated, Chronulac increases the number and frequency of bowel movements.

Most important fact about Chronulac Syrup

It may take 24 to 48 hours to produce a normal bowel movement.

How should you take Chronulac Syrup?

Take Chronulac Syrup exactly as prescribed. If you find the taste of Chronulac unpleasant, it can be mixed with water, fruit juice, or milk.

  • If you miss a dose...Take the forgotten dose as soon as you remember; but do not try to "catch up" by taking a double dose.
  • Storage instructions...Store at room temperature. Avoid excessive heat or direct light. The liquid may darken in color, which is normal. Do not freeze.

What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Chronulac.

  • Side effects may include:Diarrhea, gas (temporary, at the beginning of use), intestinal cramps (temporary, at the beginning of use), nausea, potassium and fluid loss, vomiting

Why should Chronulac Syrup not be prescribed?

Chronulac contains galactose, a simple sugar. If you are on a low-galactose diet, do not take Chronulac Syrup.

Special warnings about Chronulac Syrup

Because of its sugar content, Chronulac Syrup should be used with caution if you have diabetes.

If unusual diarrhea occurs, contact your doctor.

Possible food and drug interactions when taking Chronulac Syrup

If Chronulac is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Chronulac with non-absorbable antacids.

Special information if you are pregnant or breastfeeding

The effects of Chronulac during pregnancy have not been adequately studied. If you are pregnant or plan to become pregnant, inform your doctor immediately. Chronulac may appear in breast milk and could affect a nursing infant. If Chronulac Syrup is essential to your health, your doctor may advise you to stop breastfeeding until your treatment is finished.

Recommended dosage for Chronulac Syrup

The usual dose is 1 to 2 tablespoonfuls (15 to 30 milliliters) daily. Your doctor may increase the dose to 60 milliliters a day, if necessary.

Safety and effectiveness for children have not been established.


Any medication taken in excess can have serious consequences. If you suspect an overdose, seek medical treatment immediately.

  • Symptoms of Chronulac overdose may include:Abdominal cramps, diarrhea
  • Lactulose Prescribing Information (FDA)
  • Lactulose Professional Patient Advice (Wolters Kluwer)
  • Constulose Solution MedFacts Consumer Leaflet (Wolters Kluwer)
  • Constulose Prescribing Information (FDA)
  • Enulose Solution MedFacts Consumer Leaflet (Wolters Kluwer)
  • Enulose Concise Consumer Information (Cerner Multum)
  • Enulose Prescribing Information (FDA)
  • Generlac Prescribing Information (FDA)
  • Kristalose Crystals MedFacts Consumer Leaflet (Wolters Kluwer)

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