Augmentin vs. Doxycycline

See how Augmentin and Doxycycline compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Augmentin covers beta-lactamase-producing bacteria that plain amoxicillin cannot treat, while doxycycline covers a broader range of organisms including tick-borne and sexually transmitted infections.

  • Doxycycline is usually taken once or twice daily, while standard Augmentin tablets require dosing every 8 to 12 hours.

  • Doxycycline carries boxed warnings for tooth discoloration and fetal harm, making it unsuitable for young children and pregnant patients, while Augmentin is generally considered safer in those groups.

Augmentin vs. Doxycycline Drug Summary

Augmentin

Augmentin is a penicillin-class antibiotic that combines amoxicillin with clavulanate, a beta-lactamase inhibitor that helps it fight bacteria resistant to plain amoxicillin. It treats infections like pneumonia, sinusitis, ear infections, and urinary tract infections. It comes as tablets, chewable tablets, or liquid, taken by mouth every 8 to 12 hours depending on the dose.

Doxycycline

Doxycycline is a tetracycline-class antibiotic used for a wide range of bacterial infections, including chlamydia, Rocky Mountain spotted fever, and respiratory infections. It also serves as malaria prevention and anthrax exposure prophylaxis. It is taken by mouth, usually once or twice daily after a higher first-day dose.

Augmentin vs. Doxycycline Side Effects

Augmentin

Most common
nausea (up to 3%)
vomiting (up to 1%)
diarrhea (up to 9%)
vaginitis (up to 1%)

Doxycycline

Most common
nausea (rate not specified)
vomiting (rate not specified)
esophageal irritation (rate not specified)
rash (rate not specified)

Augmentin vs. Doxycycline Dosage

Augmentin

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 250 mg/125 mg At the start
Maximum dose 2000 mg/125 mg If needed
Dose changes 4 increases As tolerated

Doxycycline

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 200 mg Day 1
Maximum dose 100 mg twice daily If needed
Dose changes 6 increases As tolerated

Augmentin vs. Doxycycline Indications

Augmentin

Augmentin is FDA-approved for common bacterial infections of the ears, sinuses, lungs, skin, and urinary tract. It is often chosen when a bacterial strain is suspected to produce beta-lactamase, an enzyme that would otherwise destroy plain amoxicillin. It is not effective against viral infections.

  • Community-acquired pneumonia (Augmentin XR)

  • Acute bacterial sinusitis

  • Acute bacterial otitis media

  • Skin and skin structure infections

  • Urinary tract infections

Doxycycline

Doxycycline is FDA-approved for many bacterial and rickettsial infections, including chlamydia, Rocky Mountain spotted fever, and cholera. It also prevents malaria and treats anthrax exposure. Doctors also prescribe it off-label for Lyme disease prevention and MRSA skin infections.

  • Sexually transmitted infections (chlamydia, gonorrhea)

  • Rocky Mountain spotted fever and rickettsial infections

  • Respiratory tract infections

  • Anthrax post-exposure prophylaxis

  • Malaria prevention

Augmentin vs. Doxycycline Pros and Cons

Augmentin

Augmentin's added clavulanate lets it treat resistant bacteria that plain amoxicillin cannot, making it a reliable option for common infections. It has no FDA boxed warnings and can be used in children, including chewable and liquid forms. Standard tablets need dosing two to three times daily, and it typically costs more than generic doxycycline.

Pros

  • Treats beta-lactamase-producing bacteria resistant to amoxicillin alone

  • No FDA boxed warnings

  • Available in chewable tablets and liquid for children

  • Considered safer than doxycycline during pregnancy

Cons

  • Higher rate of diarrhea (up to 9%) than typical doxycycline regimens

  • Cannot be used in patients with penicillin allergy history

  • Standard tablets require dosing every 8 to 12 hours

  • Higher list price, roughly $80 to $150 per month before insurance

Doxycycline

Doxycycline's once-or-twice-daily dosing and broad coverage of atypical organisms make it a practical option for many infections beyond what Augmentin treats. It carries boxed warnings for tooth discoloration and fetal harm, so it is avoided in young children and pregnant patients. Its low generic cost is a plus for patients paying out of pocket.

Pros

  • Simple once-or-twice-daily dosing for most infections

  • Covers atypical organisms like rickettsia and chlamydia that Augmentin does not treat

  • Safe option for patients with penicillin allergy

  • Lower list price, roughly $10 to $40 per month for generic tablets

Cons

  • Boxed warning for permanent tooth discoloration in children under 8

  • Boxed warning for fetal harm; not used in pregnancy

  • Causes photosensitivity, requiring sun protection during treatment

  • Can irritate or ulcerate the esophagus if not taken with enough water

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