Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,703 questions · 15,007 findings · 1,416 reviews

No studies found 2,881 · 19.2%GRADE not reported 1,551 · 10.3%Very low 3,111 · 20.7%Low 3,881 · 25.9%Moderate 2,669 · 17.8%High 914 · 6.1%

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Antihistamines vs placebo

Adverse effects: impaired cognition Assessed by: adverse effect questionnaire (presence or absence given numerical values) · patients with motion sickness

Antihistamines showed no clear difference in adverse effects: impaired cognition Assessed by: adverse effect… compared with placebo (low certainty).

1 finding from 1 review

Antihistamines vs placebo

Adverse effects ‐ Blurred vision No of patients with blurred vision · patients with motion sickness

Antihistamines showed no clear difference in adverse effects: blurred vision Assessed by: adverse effect… compared with placebo (low certainty).

1 finding from 1 review

Extended‐release methylphenidate vs placebo

ADHD symptoms · adults with ADHD (available evidence for participants aged between 25 to 53 years old)
3 findings from 1 review

Mood stabilisers vs placebo

Self‐harm Measured by: clinicians Timing of outcome assessment: end of treatment · patients with borderline personality disorder

It is very uncertain whether mood stabilisers changes self‐harm Timing of outcome assessment: end of treatment (52 weeks… compared with placebo (very low certainty).

1 finding from 1 review

Antipsychotics vs placebo

Self‐harm Measured by: clinicians Timing of outcome assessment: end of treatment · patients with borderline personality disorder

It is very uncertain whether antipsychotics changes self‐harm Timing of outcome assessment: end of treatment (8 to 24… compared with placebo (very low certainty).

1 finding from 1 review