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
Cipro
Bactrim vs. Cipro Dosage
Bactrim
Cipro
| 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 |
| 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
| 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
| 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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