Drug & supplement interaction

L-cysteine + lubiprostone

lubiprostone brand name: Amitiza.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Oct 4, 2026
The bottom line No known interaction

We found no known interaction between L-cysteine and lubiprostone in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for lubiprostone states a food rule worth keeping to.

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Interaction report

L-cysteine and lubiprostone

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between lubiprostone and L-cysteine in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

L-cysteine safety at a glance

L-cysteine overall Use caution Generally well tolerated in food amounts, but the safety of high-dose supplements over time is not well studied.
Pregnancy Likely Safe When used orally in amounts found in foods. There is insufficient reliable information available about the safety of amounts greater than those found in foods;... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally in amounts found in foods. There is insufficient reliable information available about the safety of amounts greater than those found in foods;... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining lubiprostone and L-cysteine? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for lubiprostone

Interactions in our licensed database are recorded against drug classes, not just single drug names. lubiprostone is filed under a single classification — oral drugs. L-cysteine has documented interactions with 1 drug class — the most serious being antidiabetes drugs (moderate) — and none of lubiprostone’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

L-cysteine Does Interact With Other Medications

L-cysteine has 86 moderate known drug interactions in our database — lubiprostone isn’t one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. lubiprostone)
Taking anything else?

Check Another of Your Medications Against L-cysteine

Covers the 2,830 medications we’ve checked against L-cysteine. Pick one to open its full report.

What to actually watch for

What lubiprostone’s Own FDA Label Lists

This is not an interaction — none of it involves L-cysteine. These are the most notable effects listed in the ADVERSE REACTIONS section of lubiprostone’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 2 of them are worth acting on rather than waiting out — marked below.

  • Fainting Worth acting on
  • Shortness of breath Worth acting on mentioned in 6.7% of FDA reports for lubiprostone
  • Bloating or gas
  • Constipation mentioned in 6.2% of FDA reports for lubiprostone
  • Low blood pressure
  • Swelling
  • Diarrhea mentioned in 6.6% of FDA reports for lubiprostone
  • Stomach pain
  • Nausea mentioned in 8.4% of FDA reports for lubiprostone
  • Headache mentioned in 5.2% of FDA reports for lubiprostone

Showing the 10 most notable of 11 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for lubiprostone. Read the label on DailyMed › Where a percentage is shown, it is the share of 9,403 voluntary FDA FAERS reports for lubiprostone that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. L-cysteine’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no L-cysteine side to compare — that is a limit of the record, not a statement that L-cysteine has no side effects.

Special populations

L-cysteine in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally in amounts found in foods. There is insufficient reliable information available about the safety of amounts greater than those found in foods; avoid use. Some research suggests that taking L-cysteine during lactation increases levels of free L-cysteine in breastmilk. However, these levels are lower than those found in some commercial hydrolyzed protein infant formulas.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

How to take them

Some lubiprostone Products Have a Food Rule — L-cysteine Should Not Break It

At least one FDA label for a product containing lubiprostone says to take it with food. If you take L-cysteine on an empty stomach out of habit, keep them separate — and take lubiprostone with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two lubiprostone products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

Administration Instructions ( 2.2 ) • Swallow capsules whole and do not break apart or chew, • Take capsules with food and water, • Assess periodically the need for continuous therapy.

From the Dosage and Administration section of the FDA label we read for lubiprostone — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What lubiprostone Is Prescribed For, and What L-cysteine Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. lubiprostone is a prescription medicine with approved uses on its FDA label. L-cysteine is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

lubiprostone is prescribed for: Lubiprostone treats three types of constipation. The first is chronic idiopathic constipation (long-lasting constipation with no known cause) in adults. It also treats opioid-induced constipation in adults with chronic non-cancer pain. This includes people whose pain is related to prior cancer or its treatment and who do not need frequent (for example, weekly) opioid dose increases.

Read the rest of what lubiprostone is prescribed for

The third use is irritable bowel syndrome with constipation (IBS-C) in women 18 and older.

L-cysteine has been studied for:

  • Cancer studied, not established L-cysteine has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    L-cysteine for cancer

    Although there is interest in using oral L-cysteine for prevention of cancers of the upper gastrointestinal tract, there is insufficient reliable information about the clinical effects of L-cysteine for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace lubiprostone on your own; if you are taking L-cysteine for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With lubiprostone

This page covers L-cysteine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the lubiprostone page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the lubiprostone page

“Every one of the 17 supplements on this page can interact with lubiprostone (Amitiza), the capsule prescribed for chronic constipation, by changing how much of the drug your gut absorbs. That calls for real vigilance, because most are fiber and bulking products like psyllium and glucomannan, exactly what constipation patients often try…”

Reviewed by 2 · Jul 18, 2026

Open the lubiprostone interaction page

One more smart check

Taking L-cysteine as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1 real supplement products containing L-cysteine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides L-cysteine. Even though L-cysteine itself has no known interaction with lubiprostone, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where L-cysteine and lubiprostone Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement L-cysteine
Steady interest

#746 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication lubiprostone
Steady interest

#1,479 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every L-cysteine reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified October 4, 2026. The L-cysteine and lubiprostone records this page draws on were last updated June 22, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About L-cysteine

What is L-cysteine?

  • Antioxidant support
  • Skin and hair health
  • Liver support
  • Respiratory and mucus thinning
  • General protein/amino acid supplementation

L-cysteine is a sulfur-containing amino acid your body uses to make proteins and the antioxidant glutathione. Most people get enough from food, and supplements are usually well tolerated, but strong evidence supporting specific health benefits from extra L-cysteine is limited. Talk to your pharmacist or doctor before starting it, especially if you are pregnant, breastfeeding, or have a health condition.

Amino acid (not a plant part) · Capsules, tablets, powder; also available as N-acetylcysteine (NAC)

An interaction check asks whether these two react with each other — it does not ask whether L-cysteine is a good idea for someone in your situation. Here is what our L-cysteine record says about it on its own.

L-cysteine: dosing

There is no official standardized dose of L-cysteine established for general supplement use. Products vary widely in strength, and much of the dosing research actually involves NAC rather than plain L-cysteine.The safest approach is to follow the directions on the product label and not exceed the recommended amount. Higher doses have not been well studied and may increase the risk of side effects.

From our L-cysteine monograph — the full record covers uses, side effects and every documented interaction.

Read the full L-cysteine monograph & all interactions
Medication

About Lubiprostone

What Is Lubiprostone Used For?

Brand name: Amitiza

Lubiprostone treats three types of constipation. The first is chronic idiopathic constipation (long-lasting constipation with no known cause) in adults.

It also treats opioid-induced constipation in adults with chronic non-cancer pain. This includes people whose pain is related to prior cancer or its treatment and who do not need frequent (for example, weekly) opioid dose increases. The third use is irritable bowel syndrome with constipation (IBS-C) in women 18 and older.

Most-Reported Side Effects for lubiprostone

From FAERS, the FDA’s public side-effect reporting system (9,403 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Nausea 792 reports
Dyspnea 634 reports
Diarrhea 619 reports
Constipation 581 reports
Fatigue 535 reports
See full Lubiprostone drug information
Keep checking

Other Drugs & L-cysteine

Browse every other medication we’ve checked against L-cysteine — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
86Moderate
0Minor
2,743No known interaction
86 Moderate 2,743 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the L-cysteine page.

No interaction 2,743 drugs checked — show the list

We also checked L-cysteine against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full L-cysteine list.

See the full L-cysteine interactions page
See every supplement checked against lubiprostone, ranked by severity
Evidence & sources

L-cysteine References

The 2 references that drive our L-cysteine monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Dowlati Y, Maheux M, Meyer JH. The effect of oral L-cysteine on breast milk and plasma cysteine concentrations. Neuropsychiatr Dis Treat 2020;16:3163-3172.
  2. Lee S, Han KH, Nakamura Y, et al. Dietary L-cysteine improves the antioxidative potential and lipid metabolism in rats fed a normal diet. Biosci Biotechnol Biochem 2013;77(7):1430-4.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking L-cysteine and lubiprostone Together: Common Questions

Is it safe to take L-cysteine with lubiprostone?
We do not list a known interaction between L-cysteine and lubiprostone. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Should I take L-cysteine and lubiprostone at the same time of day?
At least one FDA label for a product containing lubiprostone says to take it with food. If you take L-cysteine on an empty stomach out of habit, keep them separate and take lubiprostone with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two lubiprostone products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Are L-cysteine and lubiprostone used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for L-cysteine in each. That is a conversation for your prescriber, especially if lubiprostone is being adjusted to a target.
How was the L-cysteine and lubiprostone combination checked?
Interactions in our licensed database are recorded against drug classes. lubiprostone is filed under 1 classification, and L-cysteine has documented interactions with 1 drug class — none of lubiprostone's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does L-cysteine interact with any other medications?
Yes. L-cysteine has 86 documented drug interactions in our database — lubiprostone is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does lubiprostone interact with any supplements?
Yes. lubiprostone has documented interactions with 17 supplements in our database — L-cysteine is not one of them. The lubiprostone interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

L-cysteine monograph Uses, safety profile, and every drug interaction in one place Lubiprostone drug information The full plain-English guide to this medication lubiprostone supplement interactions Every supplement checked against lubiprostone, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About lubiprostone and L-cysteine?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.