I know this is a little old but I thought I'd add-
Like others have said, don't bother as RBC's take time too mature.
Plus once the RBC's are up functioning you need to learn to train/perform through the usual fatigue indicators (respiration, heart rate, muscle fatigue, lungs/muscle burning.) Once you realize you have more in the tank it's good but you still need the mental edge to push through - for me at least.
Ran it for years and didn't find it dangerous if you take precautions - stay hydrated and a baby aspirin a day.
Well said. Ya 99% of the people that comment on EPO have never used it. If you have experience with it, you will know its not going to turn your blood to sludge overnight and kill you.
EPO works well to increase your endurance, but like others said here, 3 days aint enough to get any effect from it. You will need to load on it for a few weeks, then get on a maintenance dose after that. Its dangerous if your not monitoring the hematocrit levels, and you get dehydrated. Fortunately its not hard to monitor the crit if you have a centrifuge to spin your blood and get a reading. A cheap centrifuge is only a few hundred bucks. If you are going to use it, make sure you know what your crit levels are before you start. A lot of guys will start to use it, then test the crit levels several weeks or months later, and this prevents them from knowing how much of an increase the EPO is responsible for.
If you really know what your doing and your not loaded up on a bunch of other AAS it will really work well for you, but its not some super drug that will turn you into a badass endurance athlete.. just like steroids wont turn you into a ripped bber if your not training with weights properly.. The guys that die while using it are pushing the envelope. The cyclists that have died from it could have died just as easy from the massive amounts of stimulants they were on. Any Strongmen that 'died from it' were certainly on other drugs as well that probably caused/helped with their demise. Personally I think it works best when your not using any AAS, or very minimal doses, similar to TRT etc. When your loaded up on gear and using EPo you'll burn out from lactic acid burn before you can really experience the effects of the EPO, thats my experience at least.