Evidence from meta- analysis of r and omised controlled trials ( RCTs ) and r and omised pragmatic trials was found in support of greater efficacy of the serotonin noradrenaline reuptake inhibitors ( SNRIs ) , venlafaxine and duloxetine , in moderate to severe depression compared to SSRIs but no evidence was found for superiority of milnacipran .
There is sufficient current evidence that demonstrates an increase in efficacy , when noradrenaline reuptake is added to serotonin ( 5-HT ) reuptake , to suggest that patients with severe depression or those who have failed to reach remission with a SSRI may benefit from treatment with a SNRI .
Selective serotonin reuptake inhibitors ( SSRIs ) are recommended as first-line pharmacological treatment for depression and are the most commonly prescribed class of antidepressants .
However , there is substantial evidence that noradrenaline has a role in the pathogenesis and treatment of depression .
This review aims to examine the evidence of including noradrenaline reuptake inhibition with serotonin reuptake inhibition with respect to increasing efficacy in the treatment of depression .
Venlafaxine XR demonstrates higher rates of sustained remission compared to fluoxetine, paroxetine or placebo
The combined serotonin – norepinephrine reuptake inhibitor , venlafaxine XR , has demonstrated significant response and remission in patients diagnosed with depression when measured with the Hamilton Depression Rating Scale ( HAM-D ) . This pooled analysis of data from five studies compared the sustained remission of depressive symptoms in patients treated with venlafaxine XR , the selective serotonin reuptake inhibitors ( SSRIs ) fluoxetine or paroxetine , or placebo .  Data from 1391 subjects enrolled in five active and placebo-controlled studies who met the DSM-III-R or DSM-IV criteria for major depressive disorder were analysed . Three treatment groups were compared : venlafaxine XR ( n=560 ) , fluoxetine/paroxetine ( n=298 ) and placebo ( n=496 ) . Mean treatment duration was 8 weeks . Responders were defined as those patients whose HAM-D-21 score decreased by ≥50 % from baseline . Remission was defined as a HAM-D-17 score ≤7 . Sustained remission was defined as maintenance of remission through week 8 or the end of treatment ( if before week 8) and for ≥2 weeks . Between-group rate comparisons in outcome measures were carried out using Fisher 's exact and log-rank tests . Venlafaxine XR produced significantly higher rates of sustained remission in depressed patients compared to fluoxetine/paroxetine or placebo over this 8-week treatment period . As early as week 2 , a significantly greater proportion of patients treated with venlafaxine  achieved improved depression scores ( remission and response ) . A significantly greater rate of remission and sustained remission  occurred with venlafaxine compared to placebo  . Remission was achieved earlier with venlafaxine and lasted throughout the remainder of the study . These results demonstrate that venlafaxine XR is more effective than fluoxetine/paroxetine for sustaining remission of depressive symptoms
Evidence from meta- analysis of r and omised controlled trials ( RCTs ) and r and omised pragmatic trials was found in support of greater efficacy of the serotonin noradrenaline reuptake inhibitors ( SNRIs ) , venlafaxine and duloxetine , in moderate to severe depression compared to SSRIs but no evidence was found for superiority of milnacipran .
There is sufficient current evidence that demonstrates an increase in efficacy , when noradrenaline reuptake is added to serotonin ( 5-HT ) reuptake , to suggest that patients with severe depression or those who have failed to reach remission with a SSRI may benefit from treatment with a SNRI .
Selective serotonin reuptake inhibitors ( SSRIs ) are recommended as first-line pharmacological treatment for depression and are the most commonly prescribed class of antidepressants .
However , there is substantial evidence that noradrenaline has a role in the pathogenesis and treatment of depression .
This review aims to examine the evidence of including noradrenaline reuptake inhibition with serotonin reuptake inhibition with respect to increasing efficacy in the treatment of depression .