Drug & supplement interaction

Threonine + Moxifloxacin

Moxifloxacin brand name: Avelox.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Threonine and Moxifloxacin 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 two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Threonine and Moxifloxacin

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 Moxifloxacin and Threonine 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.

Threonine safety at a glance

Threonine overall Use caution Threonine from food is safe; supplement safety at higher doses is not well studied.
Pregnancy Use caution Amounts from food are fine, but supplements have not been well studied in pregnancy, so avoid unless advised by a clinician.
Breastfeeding Use caution Dietary amounts are normal, but supplement use during breastfeeding has not been well studied.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Moxifloxacin and Threonine? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Moxifloxacin

Interactions in our licensed database are recorded against drug classes, not just single drug names. Moxifloxacin is filed under 9 classifications — including quinolone antibiotics, organic anion-transporting polypeptide substrates (oatp), qt interval-prolonging drugs. Threonine has documented interactions with 1 drug class — the most serious being nmda antagonists (major) — and none of Moxifloxacin’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

Threonine Does Interact With Other Medications

Threonine has 3 major, known drug interactions in our database — Moxifloxacin isn’t one of them. If you take anything else, check it against the full list below.

Major 3 No known interaction 2,827 (incl. Moxifloxacin)
Taking anything else?

Check Another of Your Medications Against Threonine

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

What to actually watch for

No Interaction Found — But Data Suggests Threonine and Moxifloxacin May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Stomach upset / Constipation / Diarrhea Additional detail

    Threonine

    “Orally, some patients can experience minor gastrointestinal upset including diarrhea. Other side effects reported in people who have taken threonine include flatus and constipation.”

    Threonine · Natural Medicines adverse-effect record, reported in constipation.

    2 sources cited
    1. 12056. Lee A, Patterson V. A double blind study of L-threonine in patients with spinal spasticity. Acta Neurol Scand 1993;88:334-8. PubMed
    2. 681. Tandan R, Bromberg MB, Forshew D, et al. A controlled trial of amino acid therapy in amyotrophic lateral sclerosis: I. Clinical, functional, and maximum isometric torque data. Neurology 1996;47:1220-6. PubMed

    Moxifloxacin

    Listed in the ADVERSE REACTIONS section of the FDA label for Moxifloxacin. Read the label on DailyMed ›

  • Headache Additional detail

    Threonine

    “Orally, headache has been reported in people who have taken threonine.”

    Threonine · Natural Medicines adverse-effect record, reported in cluster headache.

    1 source cited
    1. 681. Tandan R, Bromberg MB, Forshew D, et al. A controlled trial of amino acid therapy in amyotrophic lateral sclerosis: I. Clinical, functional, and maximum isometric torque data. Neurology 1996;47:1220-6. PubMed

    Moxifloxacin

    Listed in the ADVERSE REACTIONS section of the FDA label for Moxifloxacin. Read the label on DailyMed ›

Effects for Moxifloxacin come from the ADVERSE REACTIONS section of its FDA label; effects for Threonine come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

From our Q&A

Questions About Threonine or Moxifloxacin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Threonine or Moxifloxacin, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Moxifloxacin

This page covers Threonine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Moxifloxacin page lists 155 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Apple (major), Arsenic (major) and Asarabacca (major).

By severity: 13 major · 121 moderate · 21 minor.

From our pharmacist’s overview on the Moxifloxacin page

“The supplement list for moxifloxacin (Avelox), a fluoroquinolone antibiotic, deserves genuine care, and the everyday items are the surprising part. Ordinary juices, apple, grapefruit, and sweet orange among them, block a transporter the drug needs for absorption and can cut how much reaches your blood, which for an antibiotic means the…”

Reviewed by 2 · Jul 18, 2026

Open the Moxifloxacin interaction page

One more smart check

Taking Threonine as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1,803 real supplement products containing Threonine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Threonine. Even though Threonine itself has no known interaction with Moxifloxacin, 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 Threonine and Moxifloxacin 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 Threonine
Top 25%

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

29 days ago today
Medication Moxifloxacin
Top 25%

#390 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 Threonine reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Threonine and Moxifloxacin records this page draws on were last updated July 10, 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 Threonine

What is Threonine?

  • General amino acid/protein support
  • Muscle and tissue health
  • Immune support
  • Nervous system support (as a precursor)
  • Liver health (proposed)

Threonine is an essential amino acid your body needs but cannot make, so you must get it from food or supplements. Most people get plenty from a normal diet, and high-quality evidence for taking it as a separate supplement is limited. If you are considering threonine supplements, talk with your pharmacist or doctor first.

Amino acid (obtained from dietary protein or made synthetically) · Capsules, tablets, powder, and part of amino acid blends; also found in protein-rich foods

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

Threonine: dosing

There is no well-established standard supplement dose of threonine for general health. Studies that have used it for specific medical conditions used different amounts, and those doses were given under medical supervision.If you choose to use a threonine product, follow the directions on the label and do not exceed the recommended amount.

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

Read the full Threonine monograph & all interactions
Medication

About Moxifloxacin

What Is Moxifloxacin Used For?

Brand name: Avelox

Moxifloxacin tablets and intravenous (IV) injection are approved for adults 18 and older to treat bacterial infections including community-acquired pneumonia, uncomplicated and complicated skin infections, complicated abdominal infections, plague, acute bacterial sinusitis, and acute bacterial flare-ups of chronic bronchitis. Note: moxifloxacin should only be used for sinusitis and chronic bronchitis flare-ups when no other antibiotic option is available, due to the risk of serious side effects.

Moxifloxacin ophthalmic solution (eye drops) — including the brand Vigamox — is a separate, topical formulation used only in the eye to treat bacterial conjunctivitis (pink eye) caused by susceptible bacteria. The eye drop form is not used for body-wide infections.

See full Moxifloxacin drug information
Keep checking

Other Drugs & Threonine

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

3Major
0Moderate
0Minor
2,826No known interaction
3 Major 2,826 No interaction
Major

3 interactions

No interaction 2,826 drugs checked — show the list

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

Showing the 60 most looked-up of 2,826 medications checked with no known interaction — see the full Threonine list.

See the full Threonine interactions page
See every supplement checked against Moxifloxacin, ranked by severity
Evidence & sources

Threonine References

The 4 references that drive our Threonine 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. Tandan R, Bromberg MB, Forshew D, et al. A controlled trial of amino acid therapy in amyotrophic lateral sclerosis: I. Clinical, functional, and maximum isometric torque data. Neurology 1996;47:1220-6. PubMed
  2. Lee A, Patterson V. A double blind study of L-threonine in patients with spinal spasticity. Acta Neurol Scand 1993;88:334-8. PubMed
  3. Blin O, Pouget J, Aubrespy G, et al. A double-blind placebo controlled trial of L-threonine in amyotrophic lateral sclerosis. J Neurol 1992;239:79-81.
  4. Roufs JB. L-threonine as a symptomatic treatment for amyotrophic lateral sclerosis (ALS). Med Hypotheses 1991;34:20-3. PubMed

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 Threonine and Moxifloxacin Together: Common Questions

Is it safe to take Threonine with Moxifloxacin?
We do not list a known interaction between Threonine and Moxifloxacin. 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.
Do Threonine and Moxifloxacin have any of the same side effects?
Yes — our sources link each of them separately to 4 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
How was the Threonine and Moxifloxacin combination checked?
Interactions in our licensed database are recorded against drug classes. Moxifloxacin is filed under 9 classifications, and Threonine has documented interactions with 1 drug class — none of Moxifloxacin'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 Threonine interact with any other medications?
Yes. Threonine has 3 documented drug interactions in our database — Moxifloxacin 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 Moxifloxacin interact with any supplements?
Yes. Moxifloxacin has documented interactions with 155 supplements in our database — Threonine is not one of them. The Moxifloxacin 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

Threonine monograph Uses, safety profile, and every drug interaction in one place Moxifloxacin drug information The full plain-English guide to this medication Moxifloxacin supplement interactions Every supplement checked against Moxifloxacin, 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 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Moxifloxacin and Threonine?

Our pharmacists answer your medication & supplement questions — free.

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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.