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[R-meta] Meta-analysis Hedges g - comparisons with same placebo

P. Roberto Bakker 
Hi, 

We are conducting a meta-analysis of RCTs between antidepressants and placebo and calculate Hedges g. 
Question:
How can we deal with studies which compare different antidepressants with the same placebo? Our concern is when we include the different antidepressant comparisons with the same placebo in the meta-analysis the placebo size will increase artificially which will lead to more precise spurious results. If our reasoning is correct, how can we deal this?

Thank you in advance, 

Roberto

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P. Roberto Bakker Meta-analysis Hedges g - comparisons with same placebo Oct 17 Gerta Ruecker Meta-analysis Hedges g - comparisons with same placebo Oct 18 P. Roberto Bakker Meta-analysis Hedges g - comparisons with same placebo Oct 18 Gerta Ruecker Meta-analysis Hedges g - comparisons with same placebo Oct 18 Viechtbauer Wolfgang (STAT) Meta-analysis Hedges g - comparisons with same placebo Oct 19 P. Roberto Bakker Meta-analysis Hedges g - comparisons with same placebo Oct 19 Viechtbauer Wolfgang (STAT) Meta-analysis Hedges g - comparisons with same placebo Oct 19 P. Roberto Bakker Meta-analysis Hedges g - comparisons with same placebo Oct 19