Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

22 questions · 22 findings · 4 reviews · Skin

No studies found 10 · 45.5%GRADE not reported 1 · 4.5%Very low 1 · 4.5%Low 3 · 13.6%Moderate 6 · 27.3%High 1 · 4.5%

Topical clindamycin vs placebo

Adverse effects (non‐serious) · participants with hidradenitis suppurativa

Topical clindamycin showed no clear difference in adverse effects (non‐serious) compared with placebo (moderate certainty).

1 finding from 1 review

Adalimumab weekly vs placebo

Frequency of serious adverse effects · participants with hidradenitis suppurativa

Adalimumab weekly showed no clear difference in frequency of serious adverse effects compared with placebo (moderate certainty).

1 finding from 1 review

Adalimumab every other week vs placebo

Frequency of serious adverse effects · participants with hidradenitis suppurativa

Adalimumab every other week showed no clear difference in frequency of serious adverse effects compared with placebo (high certainty).

1 finding from 1 review

Intervention not reported

Frequency of serious adverse effects 20 to 24 weeks · participants with moderate and severe acne

It is very uncertain whether the intervention changes frequency of serious adverse effects 20 to 24 weeks (very low certainty).

1 finding from 1 review

Ethinyl estradiol 35 μg + cyproterone acetate 2 mg vs ethinyloestradiol and norgestrel

Number of participants reporting non‐serious adverse effects · participants with hidradenitis suppurativa

Ethinyloestradiol and cyproterone acetate probably leads to lower number of participants reporting non‐serious adverse effects compared with ethinyloestradiol and norgestrel (moderate certainty).

1 finding from 1 review

Guselkumab vs placebo

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

Guselkumab showed no clear difference in proportion of participants with adverse effects serious or severe… compared with placebo (low certainty).

1 finding from 1 review

Secukinumab vs placebo

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

Secukinumab probably leads to higher proportion of participants with adverse effects serious or severe… compared with placebo (moderate certainty).

1 finding from 1 review

UVA1 vs narrowband UVB

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

The review found no eligible studies for this question.

1 finding from 1 review

Etretinate vs PUVA

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

The review found no eligible studies for this question.

1 finding from 1 review

Alitretinoin vs placebo

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

The review found no eligible studies for this question.

1 finding from 1 review

Etanercept vs placebo

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

The review found no eligible studies for this question.

1 finding from 1 review

Ustekinumab vs placebo

Proportion of participants with adverse effects serious or severe enough to have caused withdrawal ‐ not reported · chronic palmoplantar pustulosis

The review found no eligible studies for this question.

1 finding from 1 review

Fexofenadine 120 mg/d vs placebo (1‐week intervention)

Primary outcome 2. Proportion of participants reporting adverse effects and serious adverse events throughout the study period · adults with eczema

Fexofenadine 120 mg/d showed no clear difference in primary outcome 2. Proportion of participants reporting adverse… compared with placebo (1‐week intervention) (moderate certainty).

1 finding from 1 review

Loratadine 10 mg vs placebo (4‐week intervention)

Primary outcome 2. Proportion of participants reporting adverse effects and serious adverse events throughout the study period · adults with eczema

Loratadine 10 mg/d showed no clear difference in primary outcome 2. Proportion of participants reporting adverse… compared with placebo (4‐week intervention) (low certainty).

1 finding from 1 review

Cetirizine 0.5 mg/kg/d vs placebo (18‐month intervention)

Primary outcome 2. Proportion of participants reporting adverse effects and serious adverse events throughout the study period · children with eczema

Cetirizine 0.5 mg/kg/d showed no clear difference in primary outcome 2. Proportion of participants reporting adverse… compared with placebo (18‐month intervention) (moderate certainty).

1 finding from 1 review