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

Most common
Vomiting (common)
Nausea (common)
Diarrhea (common)
Photosensitivity (common)

Bactrim

Most common
Vomiting (common)
Nausea (common)
Anorexia (common)
Rash (common)

Doxycycline vs. Bactrim Dosage

Doxycycline

Dosage
Dosage Table
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

Dosage
Dosage Table
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.