Study	Reason for exclusion
Arai 2010	No mention of blinding of therapies in gabapentin plus imipramine additions to opioids in cancer pain
Berry 2005	Single dose of gabapentin for treatment of acute herpes zoster
Dallocchio 2000	Painful diabetic neuropathy, open comparison of gabapentin and amitriptyline
Ding 2014	Not indexed as blinded. Gabapentin assessed as add‐on therapy to transdermal fentanyl
Dworkin 2009	Study for acute herpes zoster pain
Ho 2009	Short duration (1 week at stable dose), potential use of significant dose of gabapentin as rescue medication
Jean 2005	Postherpetic neuralgia, with open administration of gabapentin
Kasimcan 2010	Acute and chronic radicular pain, with open administration of gabapentin
Keskinbora 2007	Neuropathic cancer pain, with open administration of gabapentin
Kimos 2007	Condition (CRPS 1) not now defined as neuropathic pain
Ko 2010	Open comparison of gabapentin and tramadol/paracetamol in painful diabetic neuropathy
McCleane 2001	Low back pain, not specifically neuropathic
NCT00634543	Open label study
NCT01263132	No active or placebo comparator, randomised for B vitamins not gabapentin
NCT01623271	Single group cohort without comparator
Nikolajsen 2006	Trial of gabapentin in surgery to test whether use in surgery prevents development of phantom pain. There was no beneficial effect
Pandey 2002	Guillain‐Barré syndrome
Pandey 2005	Guillain‐Barré syndrome
Salvaggio 2008	Facial pain, open administration of gabapentin plus tramadol
Sator‐Katzenschlager 2005	Chronic pelvic pain, with open administration of gabapentin
Tanenberg 2011	Open label study
Van de Vusse 2004	Condition (masticatory pain) not now defined as neuropathic pain
Yaksi 2007	Lumbar spinal stenosis, with open administration of gabapentin
Yelland 2009	No‐of‐1 study with short treatment periods of 2 weeks in chronic neuropathic pain, and with high withdrawal rate. Study design highly unusual and difficult to interpret
Yildrim 2003	Not double‐blind