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What do systematic reviews say?

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Evidence found and GRADE certainty

17 questions · 17 findings · 4 reviews · Pain, Palliative and Supportive Care

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No studies found 8 · 47.1%GRADE not reported 0 · 0%Very low 8 · 47.1%Low 0 · 0%Moderate 0 · 0%High 1 · 5.9%

Hydromorphone vs fentanyl

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · people with moderate to severe cancer pain
1 finding from 1 review

Hydromorphone vs fentanyl

Relief of pain · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Hydromorphone vs fentanyl

Nausea · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Hydromorphone vs fentanyl

Vomiting · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Hydromorphone vs fentanyl

Dizziness · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Hydromorphone vs fentanyl

Constipation · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Hydromorphone vs fentanyl

Quality of life · people with moderate to severe cancer pain

The review found no eligible studies for this question.

1 finding from 1 review

Tramadol vs fentanyl

Proportion of participants with moderate to severe pain up to 6 hours after the procedure · children undergoing surgery

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Moderate benefit: at least 30% reduction in pain, or PGIC much or very much improved · Adults with chronic neuropathic pain
1 finding from 1 review

Intervention not reported

Substantial benefit: at least 50% reduction in pain, or PGIC much improved · Adults with chronic neuropathic pain

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Lack of efficacy withdrawal in randomised double‐blind phase · Adults with chronic neuropathic pain
1 finding from 1 review

Intervention not reported

Adverse event withdrawal in randomised double‐blind phase · Adults with chronic neuropathic pain
1 finding from 1 review

Intervention not reported

Serious adverse events · Adults with chronic neuropathic pain
1 finding from 1 review

Intervention not reported

Deaths · Adults with chronic neuropathic pain
1 finding from 1 review