Question explored with the scientific record
Amoxycillin
The short version: amoxicillin is a reasonable first-line antibiotic for common ear infections, but the evidence here is about ear infections only, and it does not show amoxicillin beats placebo.
The retrieved studies are all about acute otitis media (middle-ear infection) in children. They do not cover amoxicillin for strep throat, pneumonia, sinus infections, or adults, so I cannot answer those from this evidence. Within ear infections, the picture is mixed. One review found amoxicillin-clavulanate (amoxicillin plus a booster drug) beat older antibiotics like cefaclor and penicillin [1], and in infections caused by Haemophilus influenzae it cured about 92 in 100 children versus about 74 in 100 with azithromycin [1]. But when compared to placebo, one trial showed clear benefit and another showed no difference [1]. A separate review found high-dose amoxicillin and azithromycin produced identical success, 84 in 100 in both groups [2].
| Comparison | Amoxicillin result | Comparator result |
|---|---|---|
| H. influenzae ear infection [1] | 91.6% success | 73.7% (azithromycin) |
| High-dose amoxicillin vs azithromycin [2] | 84% success | 84% |
| Amox-clav vs azithromycin, all cases [4] | 88% cure | 77.7% cure |
| H. influenzae subgroup [4] | 100% cure | 75% cure |
The safety side is thin. Azithromycin was better tolerated than amoxicillin, mostly less diarrhea [2], and one trial found diarrhea rates higher than expected in both arms [3]. A lactation study found minor side effects similar to amoxicillin [5]. None of these studies ran long-term follow-up or compared treated children to untreated ones over time, so long-term safety is simply not in this evidence.
My call: for a child with a likely bacterial ear infection, amoxicillin is a defensible first choice, but the case against placebo is weaker than the case against other antibiotics, and the long-term safety data is absent. Confidence: moderate for ear infections, not clear for anything else.
Sources used 5
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Efficacy of antimicrobials or placebo compared to amoxicillin-clavulanate in children with acute otitis media: a systematic review
In children with acute otitis media, amoxicillin-clavulanate was reported superior to other common antimicrobials and had higher H. influenzae clinical success than azithromycin, but recurrence showed no difference and placebo evidence was mixed; high heterogeneity limited meta-…
DOI: 10.24953/turkjped.2022.893 -
Comparison of Amoxicillin with Alternative Agents for the Treatment of Acute Otitis Media in Children
Trials show high-dose amoxicillin is not clinically superior to azithromycin for childhood acute otitis media and is less well tolerated, while its disproportionate eradication of penicillin-susceptible nasopharyngeal pneumococci may, hypothetically, promote resistant-strain tra…
DOI: 10.1592/phco.2005.25.12part2.124s -
High-Dose Azithromycin versus High-Dose Amoxicillin-Clavulanate for Treatment of Children with Recurrent or Persistent Acute Otitis Media
In children with acute otitis media, high-dose azithromycin had clinical success rates that did not differ significantly from amoxicillin-clavulanate; ermB-mediated high-level azithromycin resistance was rare at baseline, and adverse-event discontinuations were uncommon.
DOI: 10.1128/aac.47.10.3179-3186.2003 -
Bacterial etiology of acute otitis media and clinical efficacy of amoxicillin–clavulanate versus azithromycin
A randomized, single-blind trial in Turkish children with acute otitis media comparing a 3-day course of azithromycin to a 10-day course of amoxicillin-clavulanate, showing 60% bacterial etiology (S. pneumoniae most common) with comparable clinical efficacy and some differences …
DOI: 10.1016/j.ijporl.2005.10.004 -
The Safety of Macrolides During Lactation
A prospective, controlled observational study assessing the safety of macrolide antibiotics during lactation by comparing breastfed infants exposed to maternal macrolides with those exposed to amoxicillin, finding no pyloric stenosis and only minor adverse effects similar to amo…
DOI: 10.1089/bfm.2008.0135