Label: GENERLAC- lactulose solution
- NDC Code(s): 60432-038-16, 60432-038-64
- Packager: Morton Grove Pharmaceuticals, Inc.
- Category: HUMAN PRESCRIPTION DRUG LABEL
- DEA Schedule: None
- Marketing Status: Abbreviated New Drug Application
Updated January 8, 2019
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Generlac Solution (Lactulose Solution, USP) is a synthetic disaccharide in solution form for oral or rectal administration. Each 15 mL of Generlac Solution contains: 10 g lactulose (and less than 1.6 g galactose, less than 1.2 g lactose, less than 0.8 g epilactose and 0.1 g or less of fructose). The pH range is between 2.5 and 6.5.
Generlac Solution is a colonic acidifier for treatment and prevention of portal-systemic encephalopathy.
The chemical name for lactulose is 4-O-β-D-galactopyranosyl-D-fructofuranose. It has the following structural formula:
The molecular weight is 342.30. It is freely soluble in water.Close
- CLINICAL PHARMACOLOGY
- Bacterial degradation of lactulose in the colon acidifies the colonic contents.
- This acidification of colonic contents results in the retention of ammonia in the colon as the ammonium ion. Since the colonic contents are then more acid than the blood, ammonia can be expected to migrate from the blood into the colon to form the ammonium ion.
- The acid colonic contents convert NH3to the ammonium ion [NH4]+, trapping it and preventing its absorption.
- The laxative action of the metabolites of lactulose then expels the trapped ammonium ion from the colon.
Experimental data indicate that lactulose is poorly absorbed. Lactulose given orally to man and experimental animals resulted in only small amounts reaching the blood. Urinary excretion has been determined to be 3% or less and is essentially complete within 24 hours.
When incubated with extracts of human small intestinal mucosa, lactulose was not hydrolyzed during a 24-hour period and did not inhibit the activity of these extracts on lactose. Lactulose reaches the colon essentially unchanged. There it is metabolized by bacteria with the formation of low molecular weight acids that acidify the colon contents.Close
- INDICATIONS AND USAGE
Controlled studies have shown that lactulose solution therapy reduces the blood ammonia levels by 25 to 50%; this is generally paralleled by an improvement in the patients' mental state and by an improvement in EEG patterns. The clinical response has been observed in about 75% of patients, which is at least as satisfactory as that resulting from neomycin therapy. An increase in patients' protein tolerance is also frequently observed with lactulose solution therapy. In the treatment of chronic portal-systemic encephalopathy, lactulose solution has been given for over 2 years in controlled studies.
A theoretical hazard may exist for patients being treated with lactulose solution who may be required to undergo electrocautery procedures during proctoscopy or colonoscopy. Accumulation of H2 gas in significant concentration in the presence of an electrical spark may result in an explosive reaction. Although this complication has not been reported with lactulose, patients on lactulose therapy undergoing such procedures should have a thorough bowel cleansing with a non-fermentable solution. Insufflation of CO2 as an additional safeguard may be pursued but is considered to be a redundant measure.
In the overall management of portal-systemic encephalopathy, it should be recognized that there is serious underlying liver disease with complications such as electrolyte disturbance (e.g., hypokalemia) for which other specific therapy may be required.
Infants receiving lactulose may develop hyponatremia and dehydration.
There have been conflicting reports about the concomitant use of neomycin and lactulose solution. Theoretically, the elimination of certain colonic bacteria by neomycin and possibly other anti-infective agents may interfere with the desired degradation of lactulose and thus prevent the acidification of colonic contents. Thus the status of the lactulose-treated patient should be closely monitored in the event of concomitant oral anti-infective therapy.
Results of preliminary studies in humans and rats suggest that nonabsorbable antacids given concurrently with lactulose may inhibit the desired lactulose-induced drop in colonic pH. Therefore, a possible lack of desired effect of treatment should be taken into consideration before such drugs are given concomitantly with Generlac Solution.
Other laxatives should not be used, especially during the initial phase of therapy for portalsystemic encephalopathy, because the loose stools resulting from their use may falsely suggest that adequate Generlac Solution dosage has been achieved.
Carcinogenesis, Mutagenesis, Impairment of Fertility
There are no known animal data on long-term potential for mutagenicity.
Administration of lactulose solution in the diet of mice for 18 months in concentrations of 3 and 10 percent (v/w) did not produce any evidence of carcinogenicity.
In studies of mice, rats, and rabbits, doses of lactulose solution up to 6 or 12 mL/kg/day produced no deleterious effects in breeding, conception, or parturition.
Pregnancy Category B
Reproduction studies have been performed in mice, rats, and rabbits at doses up to 2 or 4 times the usual human oral dose and have revealed no evidence of impaired fertility or harm to the fetus due to lactulose. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
Very little information on the use of lactulose in pediatric patients has been recorded (see DOSAGE AND ADMINISTRATION).
- ADVERSE REACTIONS
Generlac Solution may produce gaseous distention with flatulence or belching and abdominal discomfort such as cramping in about 20% of patients.
Excessive dosage can lead to diarrhea with potential complications such as loss of fluids, hypokalemia, and hypernatremia. Nausea and vomiting have been reported.
To report SUSPECTED ADVERSE REACTIONS, contact Wockhardt USA, LLC, at 1-800-445-4290 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Signs and Symptoms
- DOSAGE AND ADMINISTRATION
The usual adult oral dosage is 2 to 3 tablespoonfuls (30 to 45 mL, containing 20 g to 30 g of Generlac Solution) three or four times daily. The dosage may be adjusted every day or two to produce 2 or 3 soft stools daily.
Hourly doses of 30 to 45 mL of Generlac Solution may be used to induce the rapid laxation indicated in the initial phase of the therapy of portal-systemic encephalopathy. When the laxative effect has been achieved, the dose of Generlac Solution may then be reduced to the recommended daily dose. Improvement in the patient's condition may occur within 24 hours but may not begin before 48 hours or even later.
Continuous long-term therapy is indicated to lessen the severity and prevent the recurrence of portal-systemic encephalopathy. The dose of Generlac Solution for this purpose is the same as the recommended daily dose.
Very little information on the use of lactulose in young children and adolescents has been recorded. As with adults, the subjective goal in proper treatment is to produce 2 to 3 soft stools daily. On the basis of information available, the recommended initial daily oral dose in infants is 2.5 to 10 mL in divided doses. For older children and adolescents, the total daily dose is 40 to 90 mL. If the initial dose causes diarrhea, the dose should be reduced immediately. If diarrhea persists, Generlac Solution should be discontinued.
When the adult patient is in the impending coma or coma stage of portal-systemic encephalopathy and the danger of aspiration exists, or when the necessary endoscopic or intubation procedures physically interfere with the administration of the recommended oral doses, Generlac Solution may be given as a retention enema via a rectal balloon catheter. Cleansing enemas containing soapsuds or other alkaline agents should not be used.
Three hundred mL of Generlac Solution should be mixed with 700 mL of water or physiologic saline and retained for 30 to 60 minutes. Generlac Solution enema may be repeated every 4 to 6 hours. If the enema is inadvertently evacuated too promptly, it may be repeated immediately.
The goal of treatment is reversal of the coma stage in order that the patient may be able to take oral medication. Reversal of coma may take place within 2 hours of the first enema in some patients. Generlac Solution, given orally in the recommended doses, should be started before Generlac Solution by enema is stopped entirely.
- HOW SUPPLIED
Generlac Solution (Lactulose Solution, USP, 10 g/15 mL) is a colorless to yellow, unflavored solution containing 10 g of lactulose/15 mL (667 mg lactulose/mL). It is available in the following container sizes:
- 1 Pint (473 mL) bottles (NDC 60432-038-16)
- 2 Quart (1892 mL) bottles (NDC 60432-038-64)
STORAGE AND HANDLING
Do Not Freeze
Under recommended storage conditions, a normal darkening of color may occur. Such darkening is characteristic of sugar solutions and does not affect therapeutic action. Prolonged exposure to temperatures above 30°C (86°F) or to direct light may cause extreme darkening and turbidity which may be pharmaceutically objectionable. If this condition develops, do not use.
Prolonged exposure to freezing temperatures may cause change to a semi-solid, too viscous to pour. Viscosity will return to normal upon warming to room temperature.
Dispense in original container or in a tight, light-resistant container with child-resistant closure as defined in the USP.
To The Pharmacist: When ordering this product, include the product number (or NDC) in the description.
Product No.: 8038
Morton Grove Pharmaceuticals, Inc.
Morton Grove, IL 60053
Morton Grove Pharmaceuticals, Inc.
Morton Grove, IL 60053
Wockhardt USA, LLC.
Parsippany, NJ 07054
- PACKAGE LABEL.PRINCIPAL DISPLAY PANEL
10 g/15 mL
(Lactulose Solution, USP)
For Oral or Rectal Administration
INDICATIONS: FOR THE PREVENTION
AND TREATMENT OF PORTAL-SYSTEMIC
ENCEPHALOPATHY. SEE INSERT
LABELING FOR FULL INFORMATION.
DO NOT USE IF INNER FOIL SEAL PRINTED "SEALED
FOR YOUR PROTECTION" IS BROKEN OR MISSING.
BULK CONTAINER —
NOT FOR HOUSEHOLD USE
NET: 2 Quarts (1892 mL)
- INGREDIENTS AND APPEARANCE
Product Information Product Type HUMAN PRESCRIPTION DRUG Item Code (Source) NDC:60432-038 Route of Administration ORAL, RECTAL Active Ingredient/Active Moiety Ingredient Name Basis of Strength Strength LACTULOSE (UNII: 9U7D5QH5AE) (LACTULOSE - UNII:9U7D5QH5AE) LACTULOSE 10 g in 15 mL Packaging # Item Code Package Description Marketing Start Date Marketing End Date 1 NDC:60432-038-16 473 mL in 1 BOTTLE, PLASTIC; Type 0: Not a Combination Product 10/31/1996 2 NDC:60432-038-64 1892 mL in 1 BOTTLE, PLASTIC; Type 0: Not a Combination Product 10/31/1996 Marketing Information Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date ANDA ANDA074603 10/31/1996 Labeler - Morton Grove Pharmaceuticals, Inc. (801897505) Registrant - Morton Grove Pharmaceuticals, Inc. (801897505) Establishment Name Address ID/FEI Business Operations Morton Grove Pharmaceuticals, Inc. 801897505 ANALYSIS(60432-038) , LABEL(60432-038) , REPACK(60432-038)