evidencegaps
Primary study · included by 1 review

Effect of combining tramadol and morphine in adult surgical patients: a systematic review and meta-analysis of randomized trials.

Martinez 2015 · Martinez V, Guichard L, Fletcher D · British journal of anaesthesia · 2015

Included by

Efficacy and Harms of Opioid Analgesics for Acute Pain: Overview of Systematic Reviews and Meta-analyses.
Non-Cochrane · intervention · 2026 · cited as Martinez 2015 · Table 1 (included systematic review, ref 65)

The review does not say which of its outcomes this study informs.

1 including review in total.