Doxycycline vs. Bactrim
See how Doxycycline and Bactrim compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Doxycycline and Bactrim treat different types of bacterial infections, so the right choice depends on the infection being treated, not personal preference.
Doxycycline covers tick-borne and rickettsial infections that Bactrim does not treat, while Bactrim is often used for urinary tract infections and Pneumocystis pneumonia.
Doxycycline carries a tooth-staining and pregnancy warning, while Bactrim carries a higher risk of severe skin reactions and is unsafe for infants under 2 months.
Doxycycline vs. Bactrim Drug Summary
Doxycycline
Doxycycline is a tetracycline-class antibiotic used to treat a broad range of bacterial infections, from tick-borne diseases and respiratory infections to certain sexually transmitted infections. It comes as a capsule, tablet, or liquid, usually taken once or twice a day depending on the infection.
Bactrim
Bactrim is a combination antibiotic (sulfamethoxazole and trimethoprim) used to treat infections like urinary tract infections, ear infections, and Pneumocystis pneumonia. It comes as a tablet or liquid, typically taken twice a day, with pediatric dosing based on body weight.
Doxycycline vs. Bactrim Side Effects
Doxycycline
Bactrim
Doxycycline vs. Bactrim Dosage
Doxycycline
Bactrim
| STAGE | DOSE | WHEN |
| Starting dose | 200 mg total | Day 1 |
| Maximum dose | 100 mg twice daily | If needed |
| Dose changes | 6 increases | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 800 mg/160 mg every 12h | At the start |
| Maximum dose | 8-10 mg/kg/day q6-12h | If needed |
| Dose changes | 3 increases | As tolerated |
Doxycycline
| STAGE | DOSE | WHEN |
| Starting dose | 200 mg total | Day 1 |
| Maximum dose | 100 mg twice daily | If needed |
| Dose changes | 6 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 q6-12h | If needed |
| Dose changes | 3 increases | As tolerated |
Doxycycline vs. Bactrim Indications
Doxycycline
Doxycycline is approved for a wide variety of bacterial infections, including tick-borne and rickettsial illnesses, respiratory infections, and certain sexually transmitted infections. It's also used for anthrax exposure prevention, malaria prevention during travel, and off-label for Lyme disease and acne.
Rocky Mountain spotted fever and rickettsial infections
Chlamydia and uncomplicated gonorrhea
Respiratory tract infections
Anthrax post-exposure prophylaxis
Malaria prevention during travel
Bactrim
Bactrim is approved for infections such as urinary tract infections, ear infections in children, and Pneumocystis pneumonia in people with weakened immune systems. It's also used for traveler's diarrhea and bacterial gastrointestinal infections like shigellosis.
Pneumocystis pneumonia treatment and prevention
Urinary tract infections
Acute otitis media in children
Traveler's diarrhea
Shigellosis
Doxycycline vs. Bactrim Pros and Cons
Doxycycline
Doxycycline has a long track record and covers infections, like tick-borne and rickettsial diseases, that many other antibiotics don't reach. It's generally well tolerated but comes with specific warnings around sun exposure, pregnancy, and use in young children.
Pros
Treats tick-borne and rickettsial infections Bactrim doesn't cover
Also used off-label for acne, rosacea, and Lyme disease
Decades of clinical use with a well-understood safety profile
No sulfa allergy risk
Cons
Causes permanent tooth staining if used in young children or during pregnancy
Requires sun protection due to photosensitivity risk
Can irritate the esophagus if not taken with enough water
Bactrim
Bactrim is a go-to option for common infections like UTIs and childhood ear infections, and it's uniquely suited for Pneumocystis pneumonia. It carries its own set of risks, particularly for people with sulfa allergies or certain blood conditions.
Pros
First-line option for uncomplicated UTIs and ear infections
Used to treat and prevent Pneumocystis pneumonia in immunocompromised patients
No sun sensitivity or tooth-staining risk
Effective for shigellosis and traveler's diarrhea
Cons
Doesn't treat tick-borne or rickettsial infections
Contraindicated in people with sulfa allergies
Higher risk of severe skin reactions like Stevens-Johnson syndrome
Common Symptoms and Related Diseases You Can Explore
Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.