Ciprofloxacin
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
A second-generation fluoroquinolone with potent gram-negative activity, including Pseudomonas aeruginosa. Used for complicated urinary tract infections, pyelonephritis, infectious diarrhea, intra-abdominal infections (with metronidazole), bone and joint infections, anthrax prophylaxis, and febrile neutropenia. Due to FDA black box warnings regarding serious adverse effects, fluoroquinolones are reserved for infections without safer alternatives.
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.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
A second-generation fluoroquinolone with potent gram-negative activity, including Pseudomonas aeruginosa. NutriStack rates the supporting evidence as strong. Common adult dosing is 250-750 mg every 12 hours; XR: 500-1000 mg once daily for UTI; IV: 200-400 mg every 8-12 hours (as prescribed by your physician), though a prescriber sets the actual dose. With long-term use it can deplete magnesium. This profile indexes 10 sources.
The bottom line
Evidence rating strong. Most-documented uses: treats complicated urinary tract infections and pyelonephritis, treats pseudomonas aeruginosa infections, treats infectious diarrhea (traveler's diarrhea, salmonella, shigella). 10 sources indexed (1989–2021), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Inhibits bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA replication, transcription, repair, and recombination. DNA gyrase introduces negative supercoils to relieve torsional strain during replication; topoisomerase IV decatenates daughter chromosomes after replication. By trapping the enzyme-DNA complex, ciprofloxacin causes double-stranded DNA breaks, leading to rapid bactericidal activity.
Dosing & protocol.
Oral bioavailability 70-80%. Do NOT take with calcium, iron, magnesium, zinc, or aluminum-containing antacids, chelation reduces absorption by up to 90%. Separate from dairy products and mineral supplements by at least 2 hours before or 6 hours after. Do not take with enteral feeds.
What it depletes.
Nutrients this medication can lower over time, and what to replace.
Magnesium
ModerateFluoroquinolones can increase renal magnesium wasting and can also bind supplemental magnesium in the gut during active treatment.
Full safety detail.
Side effects
- Nausea and diarrhea
- Tendinitis and tendon rupture (black box warning)
- Peripheral neuropathy (potentially irreversible)
- CNS effects (dizziness, headache, insomnia, seizures)
- QT prolongation
- Photosensitivity
- Clostridioides difficile-associated diarrhea
- Aortic aneurysm/dissection (rare)
Contraindications
- Known hypersensitivity to ciprofloxacin or any fluoroquinolone4,1
- Concomitant tizanidine use (marked increase in tizanidine levels via CYP1A2 inhibition)
- Myasthenia gravis (may exacerbate muscle weakness)
- History of tendon disorders related to fluoroquinolone use4
- Children under 18 (except for specific indications like anthrax, complicated UTI)
- Known aortic aneurysm or high risk for aortic dissection10
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
6- 1A systematic review and meta-analysis of levofloxacin and ciprofloxacin in the treatment of urinary tract infection.PMIDXue Z, Xiang Y, Li Y et al. · Annals of Palliative Medicine · 2021
Meta-analysis found ciprofloxacin and levofloxacin had comparable efficacy for UTI treatment; ciprofloxacin showed slightly better microbiological eradication rates but also higher resistance rates, with both effective as first-line options in areas with low resistance.
- 2Ciprofloxacin-induced cutaneous adverse drug events: a systematic review of descriptive studiesPMIDKashyap A, Sreenivasan S, Rajan AK et al. · Journal of basic and clinical physiology and pharmacology · 2021
Kashyap A, Sreenivasan S, Rajan AK et al.. Ciprofloxacin-induced cutaneous adverse drug events: a systematic review of descriptive studies. Journal of basic and clinical physiology and pharmacology. 2021
- 3Meta-analysis of efficacy and safety of inhaled ciprofloxacin in non-cystic fibrosis bronchiectasis patientsPMIDWang S, Zhang A, Yao X · Internal medicine journal · 2021
Wang S, Zhang A, Yao X. Meta-analysis of efficacy and safety of inhaled ciprofloxacin in non-cystic fibrosis bronchiectasis patients. Internal medicine journal. 2021
- 4Fluoroquinolones and the risk of tendon injury: a systematic review and meta-analysis.PMIDAlves C, Mendes D, Marques FB · European Journal of Clinical Pharmacology · 2019
Meta-analysis confirmed fluoroquinolones including ciprofloxacin significantly increased risk of tendon injury (OR 1.73) and Achilles tendon rupture, with concurrent corticosteroid use substantially amplifying the risk.
- 5Ciprofloxacin safety in paediatrics: a systematic reviewPMIDAdefurin A, Sammons H, Jacqz-Aigrain E et al. · Archives of disease in childhood · 2011
Adefurin A, Sammons H, Jacqz-Aigrain E et al.. Ciprofloxacin safety in paediatrics: a systematic review. Archives of disease in childhood. 2011
- 6Ciprofloxacin use in neonates: a systematic review of the literaturePMIDKaguelidou F, Turner MA, Choonara I et al. · The Pediatric infectious disease journal · 2011
Kaguelidou F, Turner MA, Choonara I et al.. Ciprofloxacin use in neonates: a systematic review of the literature. The Pediatric infectious disease journal. 2011
Randomized controlled trials
1- 7Safety of ciprofloxacin. A reviewPMIDRahm V, Schacht P · Scandinavian journal of infectious diseases. Supplementum · 1989
Rahm V, Schacht P. Safety of ciprofloxacin. A review. Scandinavian journal of infectious diseases. Supplementum. 1989
Reference material
3- 8Gupta K et al. International clinical practice guidelines for the treatment of acute uncomplicated cystitis and pyelonephritis in women: a 2010 update by IDSA and ESCMID. Clin Infect Dis. 2011.Source linkedPMID
- 9FDA Drug Safety Communication: FDA updates warnings for fluoroquinolone antibiotics on risks of mental health and low blood sugar adverse reactions. FDA. 2018.Source linkedPMID
- 10Pasternak B et al. Fluoroquinolone use and risk of aortic aneurysm and dissection: nationwide cohort study. BMJ. 2018.Source linkedPMID
Common questions.
Quick answers about Ciprofloxacin, drawn from the data on this page.
What is Ciprofloxacin?
A second-generation fluoroquinolone with potent gram-negative activity, including Pseudomonas aeruginosa. Used for complicated urinary tract infections, pyelonephritis, infectious diarrhea, intra-abdominal infections (with metronidazole), bone and joint infections, anthrax prophylaxis, and febrile neutropenia. Due to FDA black box warnings regarding serious adverse effects, fluoroquinolones are reserved for infections without safer alternatives.
What is Ciprofloxacin used for?
Commonly cited benefits of Ciprofloxacin include: Treats complicated urinary tract infections and pyelonephritis; Treats Pseudomonas aeruginosa infections; Treats infectious diarrhea (traveler's diarrhea, Salmonella, Shigella); Treats bone and joint infections (oral option for osteomyelitis); Anthrax post-exposure prophylaxis. NutriStack rates the overall evidence as strong.
What is a typical dose of Ciprofloxacin?
A typical adult dose of Ciprofloxacin is 250-750 mg every 12 hours; XR: 500-1000 mg once daily for UTI; IV: 200-400 mg every 8-12 hours (as prescribed by your physician). The commonly recommended form is Oral tablets, extended-release tablets, suspension, or IV. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Ciprofloxacin?
Reported side effects include nausea and diarrhea, tendinitis and tendon rupture (black box warning), peripheral neuropathy (potentially irreversible), cns effects (dizziness, headache, insomnia, seizures), qt prolongation, photosensitivity. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Ciprofloxacin?
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
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