Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,771 questions · 10,185 findings · 893 reviews

No studies found 2,109 · 20.7%GRADE not reported 1,125 · 11%Very low 2,279 · 22.4%Low 2,514 · 24.7%Moderate 1,709 · 16.8%High 449 · 4.4%

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Any antibiotic regimen plus N‐acetylcysteine vs the same regimen without N‐acetylcysteine (with or without placebo)

Allergic adverse events · patients with Helicobacter pylori infection

It is very uncertain whether any antibiotic regimen plus N‐acetylcysteine changes allergic adverse events compared with the same regimen without N‐acetylcysteine (with or without placebo) (very low certainty).

1 finding from 1 review

Quinolone vs macrolides

Quality of life Drug resistance/microbial sensitivity Serious adverse events Lung function Hospitalisations Adverse events/side effects Number of participants colonised with P aeruginosa · patients with chronic obstructive pulmonary disease

The review found no eligible studies for this question.

1 finding from 1 review

Macrolides vs tetracycline

Exacerbations (number of people experiencing ≥ 1 exacerbations) · patients with chronic obstructive pulmonary disease

Macrolide showed no clear difference in number of participants experiencing one or more exacerbations… compared with tetracycline (low certainty).

1 finding from 1 review

Macrolides vs tetracycline

Quality of life Drug resistance/microbial sensitivity Serious adverse events Lung function Hospitalisations Adverse events/side effects Number of participants colonised with P aeruginosa · patients with chronic obstructive pulmonary disease

The review found no eligible studies for this question.

1 finding from 1 review

Macrolide+tetracycline vs macrolides

All‐cause serious adverse events 60 weeks (end of study) · patients with chronic obstructive pulmonary disease

It is very uncertain whether macrolide+tetracycline changes all‐cause serious adverse events 60 weeks (end of study) compared with macrolide (very low certainty).

1 finding from 1 review

Macrolide+tetracycline vs macrolides

Number of people experiencing one or more exacerbations, Drug resistance/microbial sensitivity (as reported by trialists), including emergence of atypical bacteria, Number of participants colonised with Pseudomonas aeruginosa · patients with chronic obstructive pulmonary disease

The review found no eligible studies for this question.

1 finding from 1 review