Ciprofloxacin: Uses, Dosage, Side Effects & Precautions

Ciprofloxacin belongs to the group of fluoroquinolone antibiotics used for treating numerous bacterial infections. It is active against many gram-negative and some gram-positive bacteria and is commonly prescribed for respiratory tract, urinary tract, and gastrointestinal infections. Ciprofloxacin works by inhibiting bacterial DNA replication, which prevents bacterial growth. This guide covers ciprofloxacin uses, dosage, side effects, precautions, drug interactions, use in pregnancy and breastfeeding, brand names and its approximate price in India.

Fluoroquinolones can cause serious side effects, some of which may be long-lasting. Ciprofloxacin should be used only for infections caused by bacteria that are susceptible to it. For a few infections (acute uncomplicated cystitis, bacterial flare-ups of chronic bronchitis, and acute sinusitis), US prescribing information advises using it only when no alternative treatment options are available.

Ciprofloxacin at a Glance

Common Indications of Ciprofloxacin

• Urinary tract infections (UTIs)
• Respiratory tract infections (certain types of pneumonia, bacterial flare-ups of chronic bronchitis)
• Gastrointestinal infections (traveller’s diarrhea, when an antibiotic is appropriate)
• Typhoid fever (enteric fever), only when the infecting bacteria are susceptible to ciprofloxacin
• Complicated intra-abdominal infections (used together with metronidazole)
• Skin and soft tissue infections
• Bone and joint infections
• Chronic bacterial prostatitis
• Anthrax (post-exposure)
• Plague

Ciprofloxacin works only against susceptible bacteria. It does not treat viral infections such as colds or flu. It is not a first-choice medicine for pneumonia caused by Streptococcus pneumoniae.

Typhoid fever: Ciprofloxacin should be considered only if the infecting strain is susceptible. Resistance to fluoroquinolones is common in South Asia, and infections with resistant strains can fail to respond to treatment. For this reason, antibiotic choice is usually guided by susceptibility testing and clinical guidance where appropriate.

Ciprofloxacin Dosage and Routes

Ciprofloxacin dosing is infection-specific. There is no single dose that applies to all infections. The dose and length of treatment are set by a doctor and depend on:

• The type and severity of the infection
• Whether the bacteria causing the infection are susceptible to ciprofloxacin
• The form used (tablet, oral suspension, or intravenous)
• Kidney function, since dose adjustments are recommended when kidney function is reduced (liver function is also considered, and in children, age and weight)

For most infections in adults, ciprofloxacin is taken every 12 hours, but the specific dose and duration vary from infection to infection, and treatment can last from a few days to several weeks.

Anthrax (post-exposure): To help prevent inhalational anthrax after suspected or confirmed exposure, the adult regimen in US prescribing information is 500 mg orally every 12 hours for 60 days, started as soon as possible after exposure. This is prescribed only under medical direction, and children receive weight-based doses.

Traveller’s diarrhea: Whether an antibiotic is needed at all, and which one, depends on how severe the illness is, where the person has travelled, local resistance patterns, and their overall health. Ciprofloxacin is not automatically appropriate. Resistance to fluoroquinolones is a concern in some regions, including parts of South and Southeast Asia, so other antibiotics may be preferred.

Ciprofloxacin is available in oral (tablets and suspension) and intravenous forms, with dosage adjusted based on the severity of infection.

Do not self-dose ciprofloxacin, and do not use leftover antibiotics or antibiotics prescribed for someone else. Take this medicine only as advised by your doctor or healthcare professional. Do not start, stop, or change the dose on your own.

How to Take Ciprofloxacin

• Drink plenty of fluids during treatment.
• Do not take ciprofloxacin with dairy products (such as milk or yogurt) or calcium-fortified juice on their own, as they can reduce absorption. It may be taken with a meal that contains these products.
• Take ciprofloxacin at least 2 hours before or 6 hours after antacids containing magnesium or aluminium, sucralfate, and products containing calcium, iron or zinc, including multivitamins.
• If you miss a dose, take it when you remember unless it is less than 6 hours before your next dose. In that case, skip the missed dose and continue as scheduled. Never take a double dose.

Using Antibiotics Responsibly

• Ciprofloxacin treats bacterial infections, not viral colds or flu.
• Use it only when prescribed for an appropriate bacterial infection, and take it exactly as prescribed.
• Do not skip doses, extend treatment, or save leftover antibiotics unless a healthcare professional tells you to.
• Unnecessary antibiotic use contributes to antimicrobial resistance, which makes infections harder to treat.

Adverse Reactions of Ciprofloxacin

Common side effects:

• Nausea and diarrhoea
• Vomiting
• Rash
• Abnormal liver blood test results

Less common side effects:

• Headache and dizziness
• Photosensitivity (sensitivity to sunlight). Avoid excessive sun or UV exposure, and tell your doctor if you develop an exaggerated sunburn-like reaction.

Serious side effects (boxed warning). Fluoroquinolones, including ciprofloxacin, have been linked to disabling and potentially irreversible side effects that can occur together:

• Tendonitis and tendon rupture (boxed warning): most often affecting the Achilles tendon. It can occur within hours or days of starting treatment, or even months after finishing. Stop taking ciprofloxacin and contact your doctor immediately if you have tendon pain, swelling or inflammation.
• Peripheral neuropathy: pain, burning, tingling, numbness or weakness, usually in the arms or legs. Contact your doctor immediately.
• Central nervous system effects: such as hallucinations, anxiety, depression, insomnia, severe headaches, confusion, seizures, or thoughts of self-harm. Contact your doctor immediately.
• Worsening muscle weakness in people with myasthenia gravis.

Other serious side effects to report promptly:

• QT interval prolongation, which can cause an irregular or fast heartbeat, palpitations or fainting
• Clostridioides difficile-associated diarrhoea (C. diff): severe or persistent diarrhoea, which can start during treatment or even weeks after it ends
• Severe allergic or skin reactions, such as a rash, facial or throat swelling, or difficulty breathing
• Signs of liver problems: loss of appetite, yellowing of the skin or eyes, dark urine, itching or abdominal tenderness
• Very low or high blood sugar, particularly in people with diabetes who take glucose-lowering medicines
• An increased risk of aortic aneurysm or dissection (swelling or tearing of the aorta), especially in older adults

Contraindications of Ciprofloxacin

According to US prescribing information, ciprofloxacin should not be used in:

• Known hypersensitivity (allergy) to ciprofloxacin, other quinolone antibiotics, or any component of the product
• Use together with tizanidine

The situations listed under Precautions below (such as myasthenia gravis, previous tendon problems and QT prolongation) are warnings in which ciprofloxacin is generally avoided, rather than formal contraindications in US labelling.

Ciprofloxacin Precautions

Ciprofloxacin is generally avoided, or used with extra caution, in the following situations. Tell your doctor if any apply to you.

• Myasthenia gravis: Ciprofloxacin can exacerbate muscle weakness. Serious reactions, including deaths and the need for breathing support, have been reported. It should be avoided in people with a known history of myasthenia gravis.
• Previous tendon problems: Avoid in people with a history of tendon disorders or previous tendinitis or tendon rupture. The risk is higher in people over 60, those taking corticosteroids, and those with kidney, heart or lung transplants.
• Previous serious reaction to a fluoroquinolone: Ciprofloxacin should be avoided in people who have previously had nerve damage or other disabling reactions with this class of antibiotics.
• Heart rhythm (QT prolongation): Avoid in people with known QT prolongation or risk factors such as congenital long QT syndrome, uncorrected low potassium or magnesium, heart failure, previous heart attack or a slow heart rate, and in those taking certain heart-rhythm medicines, tricyclic antidepressants, macrolide antibiotics or antipsychotics. Older adults may be more susceptible.
• Seizure disorders or other nervous system conditions: Use with caution, as ciprofloxacin can trigger seizures or lower the seizure threshold.
• Aortic aneurysm: In people with a known aortic aneurysm or at greater risk of one, ciprofloxacin should be used only when no alternative antibiotics are available.
• Diabetes: Blood sugar can become too low or too high, particularly with glucose-lowering medicines. Doctors may recommend careful blood sugar monitoring.
• Children and adolescents (under 18): Ciprofloxacin is not simply prohibited in this age group, but its use is restricted to specific infections (complicated urinary tract and kidney infections, post-exposure anthrax, and plague) where a doctor judges that the benefits outweigh the risks. It is not a first-choice antibiotic in children because side effects were more frequent than with comparison antibiotics in studies, including joint and related tissue problems, and joint damage was seen in studies of young animals. Tendon, nerve and central nervous system effects can also occur in children. Doses depend on age, weight and the infection being treated, and are set by a doctor.

Effect of Ciprofloxacin on Pregnancy, Breastfeeding, Liver, and Kidney

• Pregnancy: Ciprofloxacin is generally avoided during pregnancy when safer alternatives are available, though it may be used if no safer alternatives are available. Published human studies have not identified a clear increase in major birth defects or miscarriage, but the available data have limitations. If you are pregnant or planning pregnancy, discuss antibiotic options with your doctor. Do not stop a prescribed medicine on your own.
• Breastfeeding: Ciprofloxacin passes into breast milk in small amounts. Recommendations differ between sources: some advise avoiding breastfeeding, or pumping and discarding milk, during treatment and for about 2 days after the last dose, while others consider breastfeeding acceptable with monitoring of the baby. Your doctor can weigh the need for ciprofloxacin against breastfeeding considerations and advise what is best for you and your baby. Do not stop breastfeeding or stop taking a prescribed medicine without medical advice. Tell your doctor if your baby develops diarrhoea, thrush, a rash, or feeding problems.
• Liver: Severe liver injury, including liver failure, has been reported. Ciprofloxacin can cause temporary rises in liver enzymes or jaundice, particularly in patients with previous liver damage. Seek medical help promptly if you develop signs of liver problems (see Adverse Reactions).
• Kidney: Dose modifications are recommended in patients with renal impairment, particularly severe impairment, since ciprofloxacin is primarily excreted by the kidneys.

Ciprofloxacin Drug Interactions

Ciprofloxacin can raise the levels of some other medicines by blocking an enzyme (CYP1A2) that helps clear them. Some combinations must be avoided, while others may need a dose change or extra monitoring.

Must not be combined (contraindicated):

• Tizanidine

Generally avoided:

• Theophylline (serious and fatal reactions have been reported)
• Medicines that prolong the QT interval, such as certain heart-rhythm medicines, tricyclic antidepressants, macrolide antibiotics and antipsychotics
• Duloxetine
• Zolpidem

May require dose adjustment or monitoring:

• Warfarin and other blood thinners (clotting tests may need closer checking)
• Diabetes medicines, especially sulfonylureas (risk of low blood sugar)
• Phenytoin, methotrexate and cyclosporine (blood levels or related tests may need monitoring)
• NSAIDs other than aspirin (may increase seizure risk)
• Other medicines, including clozapine, ropinirole, sildenafil, caffeine or other xanthine-containing products, and probenecid

Reduced absorption of ciprofloxacin: antacids, sucralfate, phosphate binders, some didanosine formulations, and products containing calcium, iron or zinc (see How to Take Ciprofloxacin).

Tell your doctor or pharmacist about all prescription and over-the-counter medicines, supplements and herbal products you use. This list is not complete.

Popular Brand Names of Ciprofloxacin

• India: Cifran, Ciplox
• US: Cipro

Ciprofloxacin tablets are available in 250 mg, 500 mg and 750 mg strengths. Available strengths vary by brand.

Approximate Price in India

Approximate price in India: ₹XX for Ciprofloxacin XXX mg, XX tablets/strip.

Prices may vary by brand, strength, pack size, pharmacy, location, discounts, and availability.

How HealthPil Can Help

At HealthPil, you can consult a qualified doctor about your symptoms, whether an antibiotic is appropriate, and questions about ciprofloxacin. Medicines should be started, adjusted, or stopped only under the guidance of a qualified healthcare professional. If you have questions about this medicine, its side effects, or your treatment plan, you can consult a doctor through HealthPil.