Hi im currently doing a systematic review and meta-analysis for the first time, and i do not entirely understand how to effectively compare 3 PDE5 inhibitor drugs against each other for my data analysis ?
Would you construct a forest plot with all studies from all 3 drugs against placebo and see which had the greatest effect?
If you want to compare them one-by-one as they have been compared head-to-head directly in the study then you should conduct 'pairwise meta-analysis'. But if you want to compare all of them at the same time then you are looking to do a 'network meta-analysis':
See here:
http://training.cochrane.org/resource/introduction-network-meta-analysis-nma
If you prefer using STATA for analysis, this article may help you too:
Article Network Meta-analysis: Application and Practice using STATA software
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