Why Is Lubiprostone So Hard to Find? [Explained for 2026]

You picked up the phone, called your pharmacy, and heard the words no one wants to hear: "We're out of stock." If you've been trying to fill a Lubiprostone (Amitiza) prescription and keep hitting walls, you're not alone. Patients across the country have reported difficulty finding Lubiprostone at local pharmacies in 2025 and 2026. This article explains why — and more importantly, what you can do about it.

What Is Lubiprostone (Amitiza)?

Lubiprostone, sold under the brand name Amitiza, is a prescription medication used to treat three conditions: chronic idiopathic constipation (CIC) in adults, irritable bowel syndrome with constipation (IBS-C) in women 18 and older, and opioid-induced constipation (OIC) in adults with chronic non-cancer pain. It was first FDA-approved in 2006 and belongs to a class of drugs called chloride channel activators.

Lubiprostone works locally in the gut — it activates ClC-2 chloride channels in the intestinal lining, which draws fluid into the intestine, softens stool, and helps it move through more easily. Because it acts locally, very little of the drug enters the bloodstream, which is one reason it has a relatively clean safety profile.

Is Lubiprostone Actually in Shortage in 2026?

As of early 2026, Lubiprostone is not listed on the FDA's official drug shortage database. There is no nationally declared shortage. However, that doesn't mean it's easy to find. Many patients still report being unable to fill their prescriptions at local pharmacies. What's happening is a combination of factors that create localized, inconsistent availability — which can feel just as frustrating as an official shortage.

Why Is Lubiprostone Hard to Find at Pharmacies?

Several factors contribute to Lubiprostone availability problems:

1. Limited Number of Generic Manufacturers

Amitiza's patents expired around 2024–2025, which opened the door for generic Lubiprostone to enter the market. Generic drugs are generally good for patients — they're cheaper and more accessible. But right now, only a small number of manufacturers produce generic Lubiprostone. When demand spikes or a single manufacturer experiences a production delay or quality issue, supply across the entire country can become inconsistent very quickly.

2. Pharmacies Don't Always Keep It Stocked

Large chain pharmacies like CVS and Walgreens make stocking decisions based on local prescription volume. If your pharmacy doesn't fill many Lubiprostone prescriptions on a regular basis, they may not keep it in their regular inventory. When you walk in with a prescription, they may need to order it — which can take days. Independent pharmacies often have more flexibility to order from multiple wholesalers, which can make them a better option when chains are out.

3. Insurance and Prior Authorization Delays

Many insurance plans require prior authorization (PA) before they'll cover Lubiprostone. Some also require step therapy — meaning you may have to try cheaper options like polyethylene glycol (MiraLAX) first before your insurer will approve Lubiprostone. These administrative hurdles can delay your prescription by days or even weeks, even when the drug is technically available.

4. The Transition from Brand to Generic Creates Gaps

The period right after patent expiration — when a brand-name drug transitions to generic — can be rocky. Pharmacies may shift away from stocking brand Amitiza but not yet have reliable supply of the generic version. This transition window often results in temporary availability gaps that affect patients who need the medication regularly.

What Should You Do If Your Pharmacy Is Out of Lubiprostone?

Don't panic — here are practical steps to try:

• Call ahead before you go. Always call the pharmacy before making a trip. Ask specifically if they have your dose (8 mcg or 24 mcg) in stock today.
• Try independent pharmacies. Independent and compounding pharmacies often source from multiple wholesalers and may have stock when chains don't.
• Use medfinder. medfinder calls pharmacies near you to check which ones actually have your medication in stock, so you don't have to spend hours on the phone.
• Ask for a 90-day supply. When you do find a pharmacy with stock, ask your doctor to write a 90-day prescription. This reduces how often you need to search for the medication.
• Consider mail-order pharmacy. Mail-order pharmacies often maintain more consistent supply and may ship a 90-day supply to your door.
• Talk to your doctor about alternatives. If Lubiprostone simply isn't available, there are effective alternatives in the same therapeutic space, including Linzess (linaclotide), Trulance (plecanatide), and Motegrity (prucalopride).

Can You Get Generic Lubiprostone Instead of Brand Amitiza?

Yes. Generic Lubiprostone became available after Amitiza's patents expired around 2024–2025. The generic contains the same active ingredient at the same dose and meets FDA standards for bioequivalence. It's significantly cheaper — typically $60–$150 for a 30-day supply with a discount card, versus $400–$530 for brand Amitiza. In most cases, switching from brand to generic is medically acceptable, but always confirm with your doctor or pharmacist first.

Will This Get Better?

Probably yes. As the generic market for Lubiprostone matures and more manufacturers come online, availability should become more reliable. However, in the meantime, patients need practical strategies to find their medication when they need it.

Next Steps

Check out our guide on how to find Lubiprostone in stock near you or learn about alternatives to Lubiprostone if you can't fill your prescription. And when you're ready to find a pharmacy that has it, medfinder is here to help.