Moxifloxacin

Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026

Moxifloxacin is a fourth-generation fluoroquinolone antibiotic used to treat respiratory tract infections such as community-acquired pneumonia, acute bacterial sinusitis, and acute bacterial exacerbations of chronic bronchitis, as well as certain skin and intra-abdominal infections. It has enhanced activity against Gram-positive organisms and atypical respiratory pathogens compared with earlier fluoroquinolones. Because of serious safety concerns, fluoroquinolones including moxifloxacin are generally reserved for infections without alternative treatment options.

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Publication status

Exploratory record, not a reviewed medical publication.

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This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.

In short

What the research says.

A quick, data-only summary. The full evidence, dosing, and sources are below.

Moxifloxacin is a fourth-generation fluoroquinolone antibiotic used to treat respiratory tract infections such as community-acquired pneumonia, acute bacterial sinusitis, and acute bacterial exacerbations of chronic bronchitis, as well as certain skin and intra-abdominal infections. NutriStack rates the supporting evidence as strong. Common adult dosing is 400 mg orally or intravenously once daily; typical course 5 to 21 days depending on indication (for example 5 days for COPD exacerbation, 7 to 14 days for community-acquired pneumonia). Ophthalmic solution dosed as 1 drop in the affected eye 2 to 3 times daily., though a prescriber sets the actual dose. With long-term use it can deplete magnesium, calcium, iron. This profile indexes 3 sources.

What it's good for

Community-acquired pneumonia²
Acute bacterial sinusitis^2,3
Acute bacterial exacerbation of chronic bronchitis^2,3
Complicated and uncomplicated skin and skin structure infections^2,3
Complicated intra-abdominal infections²

What to watch for

Nausea, diarrhea, and dyspepsia
Headache and dizziness
QT interval prolongation (dose-dependent)
Known hypersensitivity to moxifloxacin or other fluoroquinolones^1,2
History of tendon disorders or tendon rupture associated with fluoroquinolone use²

The bottom line

Evidence rating strong. Most-documented uses: community-acquired pneumonia, acute bacterial sinusitis, acute bacterial exacerbation of chronic bronchitis. 3 sources indexed (1995–2016), with 0 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

Moxifloxacin inhibits bacterial DNA replication by targeting two essential type II topoisomerase enzymes: DNA gyrase (topoisomerase II) and topoisomerase IV. By binding to and stabilizing the enzyme-DNA complex, it blocks the religation of cleaved DNA strands, preventing supercoiling regulation and chromosome segregation. This leads to lethal double-strand DNA breaks and is bactericidal. Its balanced dual-target activity against both enzymes reduces the likelihood of single-step resistance mutations relative to older fluoroquinolones.^2,1

Class

Fluoroquinolone antibiotic

Dosing

Dosing & protocol.

Common range

400 mg orally or intravenously once daily; typical course 5 to 21 days depending on indication (for example 5 days for COPD exacerbation, 7 to 14 days for community-acquired pneumonia). Ophthalmic solution dosed as 1 drop in the affected eye 2 to 3 times daily.

Recommended form

Oral tablet (400 mg) once daily; intravenous infusion for hospitalized patients; ophthalmic solution for eye infections.

Oral bioavailability is approximately 90 percent and is not significantly affected by food, so it may be taken with or without meals. However, it must be separated from polyvalent cation products. Take moxifloxacin at least 4 hours before or 8 hours after antacids, sucralfate, multivitamins with minerals, and supplements containing magnesium, aluminum, calcium, iron, or zinc, which chelate the drug and markedly reduce absorption.¹

Depletions

What it depletes.

Nutrients this medication can lower over time, and what to replace.

Magnesium

Mild

Moxifloxacin forms insoluble chelate complexes with divalent magnesium cations in the gastrointestinal tract. This is primarily a bidirectional absorption interaction: co-ingestion of magnesium-containing antacids or supplements markedly reduces fluoroquinolone bioavailability, and the chelation can correspondingly impair absorption of magnesium from the same dose. It is an interaction-driven reduction in absorption rather than true systemic depletion of body magnesium stores.

Replace Magnesium (separate administration by at least 2 hours before or 6 hours after moxifloxacin)Monitor Serum magnesium (routine monitoring not generally required for healthy patients on short courses)Onset Only relevant during concurrent dosing; effect is on absorption of the co-ingested dose, not cumulative over the typical 5 to 14 day antibiotic course.

Calcium

Mild

Calcium ions chelate moxifloxacin in the gut, forming poorly absorbed complexes. The primary clinical consequence is reduced antibiotic bioavailability when taken with calcium supplements, dairy, or calcium-fortified products; absorption of the co-ingested calcium dose may be modestly reduced. This is a co-administration absorption interaction, not a true depletion of body calcium stores.

Replace Calcium (separate administration by at least 2 hours before or 6 hours after moxifloxacin)Monitor Serum calcium (routine monitoring not generally required)Onset Limited to periods of concurrent dosing during the antibiotic course; not a cumulative depletion.

Iron

Mild

Ferrous and ferric iron form stable chelate complexes with the 4-oxo and adjacent carboxyl groups of fluoroquinolones, including moxifloxacin. Co-administration with iron supplements substantially reduces fluoroquinolone absorption and can reduce absorption of the co-ingested iron. This reflects a bidirectional gut chelation interaction during simultaneous dosing rather than systemic iron depletion.

Replace Iron (ferrous sulfate or similar; separate administration by at least 2 hours before or 6 hours after moxifloxacin)Monitor Serum ferritin and hemoglobin (only if pre-existing iron deficiency is being treated)Onset Relevant only when iron and moxifloxacin are taken together; no cumulative systemic depletion expected over a standard course.

Zinc

Mild

Zinc, a divalent cation, chelates moxifloxacin in the gastrointestinal tract, forming poorly soluble complexes. As with other multivalent minerals, the dominant effect is reduced fluoroquinolone bioavailability on concurrent dosing, with possible modest reduction in absorption of the co-ingested zinc. This is a co-administration absorption interaction, not depletion of body zinc stores.

Replace Zinc (separate administration by at least 2 hours before or 6 hours after moxifloxacin)Monitor Plasma zinc (routine monitoring not generally required)Onset Limited to concurrent dosing periods; no meaningful cumulative depletion over a typical course.

Full Moxifloxacin depletion and interaction guide →

Safety

Full safety detail.

Side effects

Nausea, diarrhea, and dyspepsia
Headache and dizziness
QT interval prolongation (dose-dependent)
Tendinitis and tendon rupture, including the Achilles tendon
Peripheral neuropathy (may be irreversible)
Central nervous system effects (confusion, insomnia, anxiety, seizures)
Photosensitivity
Clostridioides difficile-associated diarrhea
Dysglycemia (hypoglycemia and hyperglycemia)
Aortic aneurysm and dissection (rare)

Contraindications

Known hypersensitivity to moxifloxacin or other fluoroquinolones^1,2
History of tendon disorders or tendon rupture associated with fluoroquinolone use²
Myasthenia gravis (may exacerbate muscle weakness)
Concurrent use with Class IA or Class III antiarrhythmics or other QT-prolonging drugs (caution)
Known prolongation of the QT interval, uncorrected hypokalemia, or significant bradycardia

Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Reviews & position papers

1Pharmacokinetic drug interactions of fluoroquinolones with multivalent cation-containing productsLomaestro BM, Bailie GR · Clinical Pharmacokinetics · 1995
Co-administration with magnesium, aluminum, calcium, iron, or zinc forms insoluble chelates that markedly decrease fluoroquinolone bioavailability, requiring dose separation.

Reference material

2Avelox (moxifloxacin hydrochloride) Prescribing InformationBayer HealthCare Pharmaceuticals; U.S. Food and Drug Administration · FDA Label · 2016
400 mg once-daily dosing is approved for community-acquired pneumonia, acute bacterial sinusitis, COPD exacerbations, and skin and intra-abdominal infections, with black box warnings for tendon, nerve, and CNS effects.
3FDA Drug Safety Communication: serious side effects with fluoroquinolone antibacterial drugsU.S. Food and Drug Administration · FDA Drug Safety Communication · 2016
FDA advises that systemic fluoroquinolones be reserved for patients with no alternative treatment options for acute sinusitis, acute bronchitis, and uncomplicated UTI due to the risk of disabling and irreversible adverse events.

FAQ

Common questions.

Quick answers about Moxifloxacin, drawn from the data on this page.

What is Moxifloxacin?

What is Moxifloxacin used for?

Commonly cited benefits of Moxifloxacin include: Community-acquired pneumonia; Acute bacterial sinusitis; Acute bacterial exacerbation of chronic bronchitis; Complicated and uncomplicated skin and skin structure infections; Complicated intra-abdominal infections. NutriStack rates the overall evidence as strong.

What is a typical dose of Moxifloxacin?

A typical adult dose of Moxifloxacin is 400 mg orally or intravenously once daily; typical course 5 to 21 days depending on indication (for example 5 days for COPD exacerbation, 7 to 14 days for community-acquired pneumonia). Ophthalmic solution dosed as 1 drop in the affected eye 2 to 3 times daily.. The commonly recommended form is Oral tablet (400 mg) once daily; intravenous infusion for hospitalized patients; ophthalmic solution for eye infections.. These are general ranges, not personalized advice; confirm the right dose with a clinician.

What are the side effects of Moxifloxacin?

Reported side effects include nausea, diarrhea, and dyspepsia, headache and dizziness, qt interval prolongation (dose-dependent), tendinitis and tendon rupture, including the achilles tendon, peripheral neuropathy (may be irreversible), central nervous system effects (confusion, insomnia, anxiety, seizures). This is educational information; check with a healthcare professional before use.

How strong is the evidence for Moxifloxacin?

NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.

Use this with your stack

Moxifloxacin in NutriStack.

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