Prescription laxative and constipation medication costs sit on a ladder. The bottom rung holds over-the-counter products that cost a few dollars. The middle rung holds generic prescriptions such as lactulose, lubiprostone, and prucalopride. The top rung holds brand-only drugs such as Linzess and Trulance, which can cost hundreds of dollars a month without insurance. Patent protection is a big reason why brand-name drugs stay expensive, and it explains most of the jump between rungs.
This guide shows where common constipation prescriptions fall on that ladder and how to compare prices before you fill. It covers cost only. Your prescriber decides which treatment fits your situation.
When Constipation Treatment Moves From OTC to Prescription Medication
For most adults, constipation treatment starts with fiber, fluids, physical activity, and over-the-counter laxatives. The NIDDK’s constipation treatment guidance describes this stepwise approach. Prescription medicines are reserved for people whose symptoms continue.
A prescriber may move to a prescription when constipation becomes chronic, when it is part of IBS with constipation (IBS-C), or when it is caused by opioid pain medication. Each of these situations has its own FDA-approved prescription options, and each sits at a different price point.
That shift is where prices jump. OTC laxatives compete on store shelves, while newer prescriptions may have only one manufacturer.
Common Types of Prescription Constipation Medications
Prescription constipation medicines are easiest to compare by drug class. Within each class, the drugs work in a similar way and often follow similar pricing patterns.
Prescription osmotic laxatives
Lactulose oral solution draws water into the bowel. It has been available as a generic for a long time and usually sits on the lowest prescription rung. Polyethylene glycol 3350 is sold mostly over the counter, though some patients receive it by prescription.
Secretagogues
Linaclotide (Linzess), plecanatide (Trulance), and lubiprostone (Amitiza) increase fluid secretion in the intestine. They are used for chronic idiopathic constipation and IBS-C, and lubiprostone is also approved for certain opioid-induced constipation. Generic status differs sharply within this class: lubiprostone is available as a generic, while Linzess and Trulance are brand-only.
Serotonin (5-HT4) receptor agonist
Prucalopride stimulates bowel contractions and is approved for chronic idiopathic constipation in adults. The first generic launched in January 2025, and several manufacturers now supply it.
NHE3 inhibitor
Tenapanor (Ibsrela) is approved for IBS-C in adults and is currently brand-only.
Peripherally acting opioid antagonists (PAMORAs)
Naloxegol (Movantik), methylnaltrexone (Relistor), and naldemedine (Symproic) treat constipation caused by opioid pain medicines. They are generally brand-only and fall on the higher rungs.
Prescription Constipation Medication Cost Comparison
The table ranks common options by relative cost position rather than exact prices. Cash prices change often and vary by pharmacy, so check current pricing for your exact prescription.
| Medication | Generic name | Brand/generic status | Typical cost position | Key price variables |
|---|---|---|---|---|
| Lactulose oral solution | Lactulose | Generic | Lower rung | Bottle size, monthly volume, pharmacy |
| Amitiza | Lubiprostone | Generic and brand | Middle rung (generic); upper (brand) | Capsule strength, twice-daily count, manufacturer |
| Motegrity | Prucalopride | Generic and brand | Middle rung (generic); upper (brand) | Strength, number of generic suppliers, pharmacy |
| Linzess | Linaclotide | Brand only | Upper rung | Brand exclusivity, capsule strength, fill length |
| Trulance | Plecanatide | Brand only | Upper rung | Brand pricing, quantity |
| Ibsrela | Tenapanor | Brand only | Upper rung | Brand pricing, twice-daily count |
| Movantik, Relistor, Symproic | Naloxegol, methylnaltrexone, naldemedine | Brand only | Upper rung | Brand pricing, tablet vs. injection (Relistor) |
Why Some Constipation Prescriptions Cost Much More Than Others
The biggest price driver is whether a generic exists. Once several manufacturers make the same drug, competition usually pushes cash prices down. Brand-only drugs face no such pressure until their patents and exclusivity periods end. Patent settlements put the earliest licensed generic for Linzess in 2029, and the FDA has not approved a generic version of Trulance.
Several other factors move the price within each rung:
Dose and daily count. Lubiprostone and tenapanor are taken twice daily, so a 30-day supply contains about 60 units, compared with about 30 for once-daily drugs.
Strength. Some drugs are priced differently by strength, while others cost about the same at every strength.
Formulation. Relistor comes as tablets and as an injection, and the two are priced differently. Lactulose pricing depends on bottle size and monthly volume.
Quantity and fill length. A 90-day fill may lower the cost per day, but cash prices do not always scale proportionally.
Pharmacy. Each pharmacy sets its own cash prices and negotiates its own discount rates. The same prescription can cost noticeably different amounts at pharmacies a few miles apart.
Prices for prescription laxatives can vary between pharmacies, especially for brand-only drugs like Linzess. Compare the price of your exact medication and strength before you fill.
Brand vs. Generic Constipation Medication Costs
Under FDA standards for generic drugs, a generic must have the same active ingredient, strength, dosage form, and route of administration as its brand-name version. It must also work in the body the same way.
For constipation medicines, the brand-to-generic gap shows up clearly with two drugs. Lubiprostone and prucalopride are each sold as brand-name products (Amitiza and Motegrity) and as generics, and the generics are typically priced far below the brands. If your prescription is written for the brand, ask whether generic substitution is allowed.
Linzess, Trulance, and Ibsrela have no approved generic, so the brand price applies and pharmacy comparison matters more. Switching drug classes is a decision only your prescriber can make.
Can You Use a Prescription Discount Card for Constipation Medication?
Yes, in most cases. Prescription discount cards can generally be used for prescription constipation medications filled at participating pharmacies, including both generics and brand-name drugs. The discounted price varies by drug, strength, quantity, and pharmacy, and some prescriptions see little or no discount. You can check which drugs are covered by the program.
Keep three points in mind:
A discount card is not insurance. It applies a pre-negotiated rate at the pharmacy, and you pay that price yourself.
Compare before you pay. For inexpensive generics such as lactulose, the pharmacy’s own cash price or a store generic program is sometimes lower. This guide explains how to compare cash and discounted prescription prices at the counter.
Deductibles. If you have insurance but use a discount card instead, the purchase generally does not count toward your deductible or out-of-pocket maximum.
Pharmacy Shopping Example
This is a hypothetical example. The prices are for illustration only and do not reflect real or current pricing.
Maria is uninsured and has a new prescription for 60 capsules of generic lubiprostone. She checks three pharmacies near her home:
| Pharmacy (hypothetical) | Regular cash price | Price with discount card |
|---|---|---|
| Pharmacy A | $95 | $48 |
| Pharmacy B | $72 | $55 |
| Pharmacy C | $110 | $39 |
The lowest cash price and the lowest discounted price were at different pharmacies. That kind of spread is common, which is why it helps to see how pharmacy prices can differ before choosing where to fill.
Questions to Ask Before Filling a Prescription Laxative
| Question to ask | Why it matters |
|---|---|
| Is a generic available, and is substitution allowed? | Generic lubiprostone and prucalopride usually cost far less than the brands |
| What is the cash price vs. the discounted price? | Either one can be lower, depending on the drug |
| Would a 90-day quantity lower the cost per day? | Cash prices do not always scale evenly |
| Does the manufacturer offer a savings program? | Most useful for brand-only drugs |
| Is the drug in stock? | Ordering can delay your first dose |
How to Compare Your Prescription Price
An accurate comparison starts with the exact drug name, strength, form, and quantity on your prescription. Changing any one of these makes a quote unreliable. Compare at least three nearby pharmacies, noting both the regular cash price and the discounted price.
If your prescriber has approved a longer supply, compare 30-day and 90-day quantities at the same pharmacy. For brand-only drugs, also check the manufacturer’s official website for current savings programs and eligibility rules. Before the prescription is filled, confirm the price at the counter, because prices can change.
The free NuLifeSpan RX prescription discount card works at 35,000+ participating pharmacies and requires no insurance. Savings vary by medication and pharmacy, so compare the card price with your other payment options.
Where Your Prescription Lands on the Cost Ladder
| Rung | Examples | Smartest first step |
|---|---|---|
| Lower | Lactulose, OTC polyethylene glycol | Compare the pharmacy’s cash price with the discounted price |
| Middle | Generic lubiprostone, generic prucalopride | Confirm generic substitution, then compare three pharmacies |
| Upper | Linzess, Trulance, Ibsrela, opioid-induced constipation drugs | Compare prices and review manufacturer program rules |
Prescription laxative and constipation medication costs are rarely fixed. The same prescription can cost very different amounts depending on generic status, quantity, and pharmacy, so a few minutes of comparison before each fill is worth it. If cost becomes a barrier, raise it with your prescriber rather than stopping treatment on your own.
Frequently Asked Questions
What is the cheapest prescription constipation medication?
Lactulose oral solution, a long-available generic, usually sits at the lowest prescription price point. Generic lubiprostone and generic prucalopride typically cost less than brand-only options. The cheapest choice for you depends on what your prescriber considers appropriate and on local pharmacy prices.
How much does Linzess cost without insurance?
Linzess is brand-only, so its cash price usually runs to hundreds of dollars per month. Your price depends on capsule strength, quantity, and pharmacy. Compare several pharmacies with a discount card, and check the eligibility rules for AbbVie’s official savings program.
Is there a generic for Trulance?
No. As of this writing, the FDA has not approved a generic version of Trulance (plecanatide). It remains a brand-name prescription, so pharmacy comparison and manufacturer savings programs are the main ways to manage its cost.
Is generic prucalopride cheaper than Motegrity?
Generally, yes. Generic prucalopride launched in 2025, and several manufacturers now supply it. Generic prices are typically far below the brand price, but cash prices still vary by pharmacy, so compare quotes before filling.
Are opioid-induced constipation medications expensive?
Often, yes. The main prescription options for opioid-induced constipation are naloxegol (Movantik), methylnaltrexone (Relistor), and naldemedine (Symproic). They are generally brand-only, which puts them at a higher price point. Prices vary by pharmacy and formulation, so compare before filling.
