Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,756 questions · 13,493 findings · 1,305 reviews · Headline outcomes only

No studies found 2,594 · 19.2%GRADE not reported 728 · 5.4%Very low 2,868 · 21.3%Low 3,777 · 28%Moderate 2,620 · 19.4%High 906 · 6.7%

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Proton pump inhibitors (PPI) vs H2RA, placebo or no treatment

Surgery ‐ within 30 days · people with upper gastrointestinal bleeding prior to endoscopic diagnosis

Proton pump inhibitor treatment showed no clear difference in surgery ‐ within 30 days compared with H2RA, placebo or no treatment (low certainty).

1 finding from 1 review

Proton pump inhibitors (PPI) vs H2RA, placebo or no treatment

Proportion of participants with stigmata of recent haemorrhage at index endoscopy · people with upper gastrointestinal bleeding prior to endoscopic diagnosis

Proton pump inhibitor treatment showed no clear difference in proportion of participants with stigmata of recent haemorrhage at… compared with H2RA, placebo or no treatment (low certainty).

1 finding from 1 review

Proton pump inhibitors (PPI) vs H2RA, placebo or no treatment

Endoscopic haemostatic treatment at index endoscopy · people with upper gastrointestinal bleeding prior to endoscopic diagnosis

Proton pump inhibitor treatment probably leads to lower endoscopic haemostatic treatment at index endoscopy compared with H2RA, placebo or no treatment (moderate certainty).

1 finding from 1 review

Pregabalin vs placebo

50% or greater reduction in seizure frequency · people with drug‐resistant focal epilepsy

Pregabalin may leads to higher 50% or greater reduction in seizure frequency ‐ ITT analysis compared with placebo (low certainty).

3 findings from 1 review

Pregabalin vs placebo

Adverse effects: headache · people with drug‐resistant focal epilepsy

It is very uncertain whether pregabalin changes adverse effect: headache compared with placebo (very low certainty).

1 finding from 1 review

Pregabalin vs placebo

Withdrawals due to adverse events · people with drug‐resistant focal epilepsy

Pregabalin probably leads to higher treatment withdrawal due to adverse effects compared with placebo (moderate certainty).

1 finding from 1 review

Homeopathic medicinal products (non‐individualised treatment) vs placebo or usual care

Adverse events · children aged up to 16 years with ARTIs

It is very uncertain whether homeopathic medicinal products (non‐individualised treatment) changes adverse events compared with placebo or usual care (very low certainty).

1 finding from 1 review