Just drink plenty of water i mean alot like the responses above said, i am on oxy elite pro now. i dont see any prob with taking them both just space them out to be safe at least an hour or two because it could bind and effect the results.
there is nothing wrong with using them both at the same time!
caffiene is fine just as long as its not abused, anyway your only supposed to take the oxy for six to eight weeks with four week breaks, so its not like you'll be taking it all of the time which you prob already know. just like with anything your body will need time to recouperate itself. if you do that your fine!