Cipro (Ciprofloxacin) 500 mg Tablets: Prescription Fluoroquinolone Antibiotic for UTIs, Traveller’s Diarrhoea & Respiratory Infections

Information last reviewed: May 2026 — for educational purposes only.

Cipro is the best-known brand of ciprofloxacin hydrochloride, a second-generation fluoroquinolone antibacterial agent with broad-spectrum activity against both Gram-positive and Gram-negative bacteria. It is prescribed for urinary tract infections (including complicated UTIs and pyelonephritis), lower respiratory tract infections, traveller’s diarrhoea, skin and soft tissue infections, bone and joint infections, and certain sexually transmitted infections such as gonorrhoea. Ciprofloxacin is prescription-only in all major markets. The FDA has placed a Boxed Warning on all fluoroquinolones regarding serious musculoskeletal and neurological adverse effects.

What Is Ciprofloxacin?

Ciprofloxacin inhibits two bacterial enzymes essential for DNA replication: DNA gyrase (topoisomerase II) and topoisomerase IV. By blocking these enzymes, ciprofloxacin prevents bacterial chromosomal DNA from being unwound and re-ligated during replication, ultimately causing double-strand DNA breaks and bacterial cell death. It is bactericidal and acts rapidly against a wide range of pathogens including Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Staphylococcus aureus (MSSA), Salmonella and Campylobacter species.

Is Ciprofloxacin Available Over the Counter?

Ciprofloxacin is not available over the counter in the US, UK, Canada, EU, or Australia. It is prescription-only. This restriction reflects both antimicrobial resistance concerns and the drug’s serious safety profile — including tendon damage, CNS effects, and the risk of selecting resistant Gram-negative bacteria when used inappropriately. Telehealth services can prescribe ciprofloxacin for straightforward indications such as uncomplicated UTI based on symptom history and prior urine culture.

FDA Boxed Warning

All fluoroquinolones including ciprofloxacin carry a Boxed Warning (FDA’s highest safety alert) for: (1) tendinitis and tendon rupture — risk increased in patients over 60, taking corticosteroids, or with solid organ transplant; (2) peripheral neuropathy — potentially irreversible sensory or sensorimotor neuropathy; (3) central nervous system effects — including seizures, toxic psychosis, and increased intracranial pressure; (4) exacerbation of myasthenia gravis. Due to these risks, fluoroquinolones should not be used as first-line therapy for uncomplicated UTIs when alternative agents (e.g., nitrofurantoin, trimethoprim) are appropriate.

Tablet Strengths and Forms

• 250 mg tablets — for uncomplicated lower UTIs, twice daily for 3 days
• 500 mg tablets — the most commonly prescribed strength; used for respiratory, skin, joint, and complicated UTIs; typically twice daily for 7–14 days
• 750 mg tablets — reserved for severe infections including hospital-acquired pneumonia and anthrax post-exposure prophylaxis
• Cipro XR (extended-release 500 mg / 1000 mg) — once-daily formulation for uncomplicated and complicated UTIs
• Oral suspension (250 mg/5 ml, 500 mg/5 ml) — for patients who cannot swallow tablets
• IV infusion — for hospitalized patients with severe infections where oral dosing is not possible

Ciprofloxacin should be taken with a full glass of water and avoided within 2 hours of dairy products, antacids, calcium supplements, or iron — all of which impair absorption via chelation of the fluoroquinolone molecule.

Price of Generic Ciprofloxacin

Generic ciprofloxacin is one of the most affordable oral antibiotics. With a pharmacy discount card, a standard 500 mg twice-daily 7-day course costs only a few dollars in the United States. Insurance and NHS coverage further reduce or eliminate out-of-pocket cost. Brand-name Cipro is rarely dispensed given the wide availability and low cost of generics.

Frequently Asked Questions

Can ciprofloxacin treat a UTI over the counter?

No. Ciprofloxacin requires a prescription. Furthermore, treatment guidelines now recommend that fluoroquinolones such as ciprofloxacin be used only when simpler antibiotics are not suitable for UTI treatment, due to the risk of serious side effects and resistance development. Patients with UTI symptoms should seek professional assessment.

How long does ciprofloxacin take to work?

Many patients notice symptom improvement within 24–48 hours of starting a course. However, the full course must always be completed as directed, even after symptoms resolve, to prevent recurrence and resistance.

Can I take ciprofloxacin with milk or dairy?

No. Dairy products, calcium-fortified foods, antacids containing aluminium or magnesium, and iron or zinc supplements chelate ciprofloxacin in the gut and significantly reduce its absorption. Ciprofloxacin should be taken at least 2 hours before or 6 hours after such products.

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