Amoxicillin vs. Doxycycline
See how Amoxicillin and Doxycycline compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Amoxicillin and doxycycline are both effective oral antibiotics, but they come from different drug classes and target different bacteria.
Amoxicillin is generally safe in pregnancy and young children, while doxycycline is avoided in both due to fetal and tooth-development risks.
Doxycycline covers a broader range of infections, including tick-borne diseases and STIs, while amoxicillin is a first-line choice for common ear, sinus, and urinary infections.
Amoxicillin vs. Doxycycline Drug Summary
Amoxicillin
Amoxicillin is an aminopenicillin antibiotic used to treat common bacterial infections of the ear, sinus, throat, lungs, skin, and urinary tract. It is taken by mouth as a capsule, tablet, chewable, or liquid, usually two to three times a day, and has been used safely since 1974.
Doxycycline
Doxycycline is a tetracycline-class antibiotic used for infections ranging from respiratory illness and chlamydia to tick-borne diseases like Rocky Mountain spotted fever. It is taken by mouth as a capsule, tablet, or liquid, typically once or twice daily, and has been available since 1967.
Amoxicillin vs. Doxycycline Side Effects
Amoxicillin
Doxycycline
Amoxicillin vs. Doxycycline Dosage
Amoxicillin
Doxycycline
| STAGE | DOSE | WHEN |
| Starting dose | 1 g three times daily | At the start |
| Maximum dose | 1 g three times daily | Same as starting |
| Dose changes | None | Fixed dose |
| STAGE | DOSE | WHEN |
| Starting dose | 200 mg total, split doses | Day 1 |
| Maximum dose | 100 mg twice daily | If needed |
| Dose changes | 5 increases | As tolerated |
Amoxicillin
| STAGE | DOSE | WHEN |
| Starting dose | 1 g three times daily | At the start |
| Maximum dose | 1 g three times daily | Same as starting |
| Dose changes | None | Fixed dose |
Doxycycline
| STAGE | DOSE | WHEN |
| Starting dose | 200 mg total, split doses | Day 1 |
| Maximum dose | 100 mg twice daily | If needed |
| Dose changes | 5 increases | As tolerated |
Amoxicillin vs. Doxycycline Indications
Amoxicillin
Amoxicillin is FDA-approved for common bacterial infections of the ear, nose, throat, lungs, skin, and urinary tract, as well as gonorrhea and, in combination regimens, H. pylori. It does not work against viral infections and can trigger a distinctive rash in people with mononucleosis.
Ear, nose, and throat infections
Lower respiratory tract infections
Skin and skin structure infections
Urinary tract infections
H. pylori eradication (combination therapy)
Doxycycline
Doxycycline covers a broader range of infections, including tick-borne rickettsial diseases, chlamydia, and inhalational anthrax exposure, plus off-label uses like Lyme disease and acne. It is not approved for children under 8 for routine infections or for use during pregnancy, due to risks to developing teeth and the fetus.
Rocky Mountain spotted fever and rickettsial infections
Chlamydia and uncomplicated gonorrhea
Anthrax post-exposure prophylaxis
Malaria prophylaxis
Lyme disease treatment (off-label)
Amoxicillin vs. Doxycycline Pros and Cons
Amoxicillin
Amoxicillin has a long safety record and a straightforward dosing schedule, making it a common first choice for everyday bacterial infections. It is generally well tolerated but carries a real risk of allergic reaction in people with penicillin sensitivity.
Pros
Considered safe during pregnancy
Approved for children of all ages, including infants
Fewer restrictions on sun exposure or food timing
Well-established safety profile after decades of use
Cons
Not effective against tick-borne or rickettsial infections
Higher risk of allergic and anaphylactic reactions
Narrower spectrum, misses many atypical bacteria
Can cause a significant rash in patients with mono
Doxycycline
Doxycycline covers a broader range of bacteria, including atypical and tick-borne organisms, and is also used for acne and certain STIs beyond amoxicillin's reach. Its tradeoffs include sun sensitivity and restrictions in young children and pregnancy.
Pros
Broader spectrum, covers atypical and tick-borne bacteria
Also used for acne, rosacea, and STI treatment
Simple once- or twice-daily dosing for most infections
Effective for malaria and anthrax prophylaxis
Cons
Not recommended in pregnancy due to fetal risk
Can cause permanent tooth discoloration in young children
Requires sun protection due to photosensitivity risk
Must be taken with plenty of water to avoid esophageal irritation
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