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I injected 10MCG of Edex an got an erection for 2 1/2 hours should I try 5 mcg at next injection 2 1/2 hours is to much for me looking for maybe 1 hour

2.5 hrs doesn't sound too bad to me. But yeah, try using a bit less. I'd probably knock it down to 3/4 of the dose and not 1/2 but only experimentation will give you the answer.