Generlac is a brand-name drug used to treat or prevent certain brain or mental problems caused by liver disease. It may be used orally or rectally. Lactulose is the generic version of Generlac that has been approved by the FDA. The average Generlac cost is about $24.79 but this cost can be reduced to $8.31 using a Generlac coupon from SingleCare. Medicare also offers copay assistance for this Generlac under most plans.
Edit your dosage
300 solution (quantity in ml), 10gm/15mlEdit
Unlock members-only prices.Free signup.
You have 0.00 in available bonus savings. Bonus savings will be automatically applied to your next eligible prescription fill.
Show this free card to your pharmacist.

Save an extra $3 on any eligible prescription! Sign up for free
Members can save even more
and it's free to join
SingleCare’s prescription prices are based on multiple sources. The prices we publish are our best estimate, but we cannot guarantee that the price we display will exactly match the price you receive at the pharmacy. For an exact price, please contact your pharmacy and provide the BIN/GRP/PCN numbers shown on your SingleCare card.
Any SingleCare bonus savings, including the $3 signup bonus, may only be used once.
Prices updated: 12/21/2025
Members save the most
Generlac is a brand-name drug used to treat or prevent certain brain or mental problems caused by liver disease. It may be used orally or rectally. Lactulose is the generic version of Generlac that has been approved by the FDA. The average Generlac cost is about $24.79 but this cost can be reduced to $8.31 using a Generlac coupon from SingleCare. Medicare also offers copay assistance for this Generlac under most plans.
Our price history metrics are calculated from aggregate prescription data that we receive from all participating pharmacies. This chart updates daily to show new price fluctuations. If a data point is missing from the chart, it is because we do not have enough data to produce a reliable figure.
| Pharmacy | Lactulose Encephalopathy Retail Price | Lactulose Encephalopathy SingleCare Price |
|---|---|---|
| CVS Pharmacy | - | - |
| Walmart | $33.11 | $28.38 |
| Walgreens | $40.68 | $14.19 |
| Kroger Pharmacy | $33.11 | $9.46 |
These prices are based on the last month of SingleCare prescription fill data by major pharmacy. This table updates daily to show the most accurate typical prices by pharmacies. If a data point is missing from the table, it is because we do not have enough data to produce a reliable figure.
Generlac is a brand-name drug used to treat or prevent certain brain or mental problems caused by liver disease. It may be used orally or rectally. Lactulose is the generic version of Generlac that has been approved by the FDA. The average Generlac cost is about $24.79 but this cost can be reduced to $8.31 using a Generlac coupon from SingleCare. Medicare also offers copay assistance for this Generlac under most plans.
Generlac may cost around $24.79 per 240, 10gm/15ml solution (quantity in ml)s or even more if you do not have insurance coverage. Using a SingleCare Generlac discount card can help you to save on your prescription medication. Pay $8.31 when you use your savings card at neighborhood pharmacies such as CVS Pharmacy, Walmart Pharmacy, Walgreens and Duane Reade.
Generlac may have varying costs based on the type of health insurance coverage that you have. Contact your insurance provider directly to find out how much Generlac costs with your plan. SingleCare straightforward and easy to use savings option. Try our SingleCare Generlac coupon and pay $8.31 for your prescription refills at participating pharmacies such as CVS, Kroger, and Harris Teeter.
Generlac is often covered by Medicare Part D and Medicare Advantage plans. Your copay for Generlac with Medicare may vary by plan and coverage stage. Reduce the cost of your Generlac prescription down to $8.31 by using a SingleCare savings card at participating pharmacies.
Generlac is manufactured for Morton Grove Pharmaceuticals, Inc. The generic version of Generlac is Lactulose.
Generlac is a laxative derived from lactose that helps to treat chronic constipation and to treat or prevent hepatic encephalopathy or other mental problems caused by liver disease. Hepatic encephalopathy occurs when there is liver failure. Symptoms include confusion, forgetfulness, irritability, change in mood, difficulty concentrating, slurred speech, and changes in sleep-wake patterns. Lactulose, the active ingredient found in Generlac, is a colonic acidifier that works by decreasing the amount of ammonia in the blood. It is a man-made sugar solution.
Inform your doctor and pharmacist about all of your drugs (including prescription or OTC, natural products, vitamins) and medical conditions. You should make sure that Generlac is right for you with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
Your healthcare provider should also know if you are pregnant or plan on getting pregnant. You will need to discuss the benefits and risks of using Generlac while you are pregnant. Tell your doctor if you are breastfeeding. You will need to talk about any risks to your baby.
Excessive burping, stomach cramps, gas, upset stomach or throwing up are some side effects caused by Generlac. If you experience diarrhea or dehydration, stop taking Generlac and call your doctor right away.
Some people may experience an allergic reaction to Generlac. Signs of an allergic reaction can include rashes, hives, itching, red, swollen, blistered, or peeling skin with or without fever, wheezing, tightness in the chest or throat, trouble breathing, swallowing, or talking; unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
SingleCare is accepted at most national pharmacies and grocers, including the following:
Health education, drug info, wellness & more
SingleCare is a prescription discount service that offers free coupons on thousands of prescription drugs. It can be used whether you have insurance, Medicare, Medicaid, or none of the above, but it cannot be combined with insurance.
SingleCare provides transparent drug pricing, so you can compare discounts at pharmacies near you. Browse singlecare.com to find drug discounts, helpful information about your prescription, and resources to help you make informed health decisions.
Prescription savings vary by prescription and by pharmacy, and may reach up to 80% off cash price. This is a medical discount plan. This is NOT insurance. This program offers you the opportunity to locate providers of various types of medical services who will offer their services to you at discounted rates. The range of discounts for medical or ancillary services provided under the plan will vary depending on the type of provider and service received. You are fully responsible for paying for all health care services but will be entitled to receive a discount from those health care providers in accordance with the specific pre-negotiated discounted fee schedule. This program does not guarantee the quality of the services or procedures offered by the providers. Except for prescription drugs which you will pay directly to the pharmacy at the time of purchase, all other services received through a program provider will be charged to the credit card on file in your member account. The charge will include an administrative fee for use of the program. Towers Administrators LLC is the licensed discount medical plan organization with its administrative office located at 4510 Cox Road, Suite 111, Glen Allen, VA 23060. SingleCare Services, LLC is the marketer of the discount medical plan organization including its website, singlecare.com, with its corporate office located at 99 High Street, Suite 2800, Boston, MA 02110. For additional information, including an up-to-date list of providers, or assistance with any issue related to program membership, please contact member support any time at www.singlecare.com, or by calling toll-free 844-234-3057, 24 hours, 7 days a week (except major holidays). Pharmacy names, logos, brands, and other trademarks are the property of their respective owners.
Blog articles are not medical advice. They are intended for general informational purposes and are not meant to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. If you think you may have a medical emergency, immediately call your physician or dial 911.
© 2025 SingleCare Administrators. All rights reserved
© 2025 SingleCare Administrators. All rights reserved