Bactrim vs. Cipro

See how Bactrim and Cipro compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Bactrim and Cipro are both FDA-approved for urinary tract infections, but they come from different antibiotic classes with different safety profiles.

  • Bactrim blocks two steps bacteria use to make folate, while Cipro is a fluoroquinolone that stops bacterial DNA from copying itself.

  • The FDA advises using Cipro for uncomplicated UTIs only when no other antibiotic option works, because of its serious side effect risks.

Bactrim vs. Cipro Drug Summary

Bactrim

Bactrim combines sulfamethoxazole and trimethoprim, two antibacterials that block sequential steps bacteria need to make folate. It treats urinary tract infections, traveler's diarrhea, ear infections, and pneumocystis pneumonia, among other bacterial infections. It comes as a tablet, liquid, or IV injection, usually taken twice a day.

Cipro

Cipro (ciprofloxacin) is a fluoroquinolone antibiotic that stops bacteria from copying their DNA. It treats complicated and uncomplicated urinary tract infections, plus skin, bone, joint, and certain respiratory and gastrointestinal infections. It's taken as a tablet or oral solution, usually twice a day, with the dose set by infection severity.

Bactrim vs. Cipro Side Effects

Bactrim

Most common
Vomiting (not specified)
Nausea (not specified)
Rash (not specified)
Anorexia (not specified)

Cipro

Most common
Vomiting (up to 4.8%)
Nausea (up to 2.7%)
Rash (up to 1.8%)
Diarrhea (up to 4.8%)

Bactrim vs. Cipro Dosage

Bactrim

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 800 mg/160 mg every 12h At the start
Maximum dose 8-10 mg/kg/day div q6-12h If needed
Dose changes 3 increases As tolerated

Cipro

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 250 mg every 12 hours At the start
Maximum dose 750 mg every 12 hours If needed
Dose changes 2 increases As tolerated

Bactrim vs. Cipro Indications

Bactrim

Bactrim is FDA-approved for urinary tract infections, traveler's diarrhea, acute ear infections in children, and pneumocystis pneumonia in people with weakened immune systems. It's also approved for shigellosis and flare-ups of chronic bronchitis in adults. Some doctors use it off-label for MRSA skin infections, which isn't an FDA-approved use.

  • Urinary tract infections

  • Pneumocystis pneumonia (treatment and prevention)

  • Traveler's diarrhea in adults

  • Acute ear infections in children

  • Off-label: MRSA skin infections

Cipro

Cipro is FDA-approved for complicated and uncomplicated urinary tract infections, plus skin, bone, joint, and certain respiratory infections. It also treats infectious diarrhea, typhoid fever, and gonorrhea, and is used to prevent illness after anthrax exposure. The FDA advises using it for uncomplicated UTIs only when no other antibiotic is a good option, due to serious side effect risks.

  • Complicated and uncomplicated UTIs

  • Skin, bone, and joint infections

  • Infectious diarrhea and typhoid fever

  • Chronic bronchitis flare-ups

  • Anthrax exposure prevention

Bactrim vs. Cipro Pros and Cons

Bactrim

Bactrim has been used for decades and generally has predictable dosing and coverage. It carries a real risk of severe skin reactions and shouldn't be used late in pregnancy or in infants under two months. It doesn't reach Pseudomonas and some other bacteria that Cipro can treat.

Pros

  • Decades of clinical use with predictable dosing

  • Not linked to tendon rupture or nerve damage

  • No black box warning

  • Effective for pneumocystis pneumonia prevention

Cons

  • Risk of severe skin reactions (Stevens-Johnson syndrome)

  • Contraindicated in pregnancy and infants under 2 months

  • Rising bacterial resistance in some regions

  • Not effective against Pseudomonas aeruginosa

Cipro

Cipro covers a broader range of bacteria, including Pseudomonas, and works well for complicated UTIs and kidney infections. It carries a black box warning for tendon rupture, nerve damage, and mental health effects, so the FDA recommends it only when other antibiotics won't work for simple UTIs. It shouldn't be combined with tizanidine or used routinely in children.

Pros

  • Covers Pseudomonas and other tough gram-negative bacteria

  • Effective for complicated UTIs and kidney infections

  • Available as extended-release for once-daily dosing

  • Used for anthrax post-exposure prevention

Cons

  • Black box warning for tendon rupture and nerve damage

  • Can cause serious mental health and CNS side effects

  • FDA advises against use for simple UTIs when alternatives exist

  • Interacts seriously with tizanidine and theophylline

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