What do systematic reviews say?

Gabapentin vs placebo

• Gabapentin for fibromyalgia pain in adults 2017 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 150 participants
  Very low

Methadone vs placebo

• Methadone for neuropathic pain in adults 2017 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Very low

Oral hydromorphone vs placebo

The review found no eligible studies for this question.

• Hydromorphone for neuropathic pain in adults 2016 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

• Fentanyl for neuropathic pain in adults 2016 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 258 participants
  Very low

Paracetamol alone, paracetamol plus codeine, or paracetamol plus dihydrocodeine vs placebo

• Paracetamol (acetaminophen) with or without codeine or dihydrocodeine for neuropathic pain in adults 2016 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Very low

Oxycodone vs placebo

• Oxycodone for pain in fibromyalgia in adults 2016 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Very low

Intervention not reported

The review found no eligible studies for this question.

• Single dose oral ibuprofen plus codeine for acute postoperative pain in adults 2015 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

• Single dose oral etoricoxib for acute postoperative pain in adults 2014 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Low

Intervention not reported

It is very uncertain whether the intervention changes deaths (very low certainty).

• Megestrol acetate for treatment of anorexia‐cachexia syndrome 2013 · Cochrane Headline outcomes only
  RR 1.42 [1.04, 1.94]
  10 studies · 1307 participants
  Very low

Intervention not reported

• Single dose oral dexibuprofen [S(+)‐ibuprofen] for acute postoperative pain in adults 2013 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Very low

Lamotrigine 200 to 400 mg vs placebo

• Lamotrigine for chronic neuropathic pain and fibromyalgia in adults 2013 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  Very low