Your renal function all together will then be approximately 60%, which is considered mild to moderate. Your damage is presumably from hypospadias, a rather common condition where babies are born with a not fully developed urethra, causing obstruction of urine flow, and if not discovered early may cause kidney swelling and permanent damage to kidneys. In such, you have one kidney with reduced function from that, and not an ongoing disease which further damages your renal function. If you take care of your body, and don't have healt issues that imcreases the risk of further kidney damage (such as diabetes), you are probably going to be okay with *some* recreational drug use. Like the rest of us. But, if you overdo it you can afford to lose less than most of us. Please remember that your kidneys should last a lifetime, and kidneys will have some normal wear and tear in decades to come.
If anybody danced for 5 hours and only drank to bottles of water, they would be very dehydrated.
If you avoid getting very dehydrated you will probably not experience so much pain. Nobody's Kidneys will work without fluids.
At
http://dancesafe.org it is suggested to drink 1 bottle for each hour dancing of water. (by comparison, I drink one tall glass of water when I roll at home. I don't move or sweat.) They also have listed contraindications for using X, and it seems like the strain on Kidneys isn't very increased (as it is not listed). This is nothing I'm sure of, just me thinking aloud.
HOWEVER, if you are not SUPER FIT, dancing excessive for 5 hours can harm your kidneys. Damaged muscles from hard physical activity is one cause of rhabdomyolysis. Basically, if you literally dance your ass of, your ass has to pass through your kidneys, and this can cause harm to them. Signs of rhabdomyolysis is pee looking like tea (more brown than yellow). The condition can also be caused by drug use/meds.
I've tried microdosing on mdma, I don't think it's worth it. Makes me emotional, but not necessarily good. It could work for others, but I'm not aware if microdosing with MDMA being popular such as with lsd.
Having a "no roll" can make people roll again without the recommended wait. If this sounds like something you would do, I'd rather suggest you roll the best and safest you can, and rather give your body and head a good wait between. Probably at least one month, to avoid possible downregulation of serotonin receptors (experienced as depression).
Eat enough all day before you roll. If you dance all night, prepare as if it was a sports event. You need to work out regularly to prevent issues from 5 hours of dancing (not drug related, but exercise related). To compare yourself with athletes, you could run a marathon in 5 hours. I bet you would be prepared for a marathon, with a healthy diet and more than 2 bottles of water. You get the picture.
Eat well all day before, throw in a sports drink if you if you dance a lot. If you run out of energy, your body will break down muscles if it is urgent, fat takes longer to transform into energy.
Popping Xtacy and going to a rave has never been without risk. I'm not trying to say it is all safe. You want to do MDMA and go dancing, and this is about doing it as safe as you can.
The single most important thing you can do, in view if your kidney situation, is to get a test kit (or two) and test the mdma/Xtacy. In pills there is usually something else that just mdma, it could be anything from dried paint to vitamins. Don't mess with your one functional kidney, test everything, always.
Your 5 hours of dancing, if you are not athletic and doing sports regularly, is probably harder on your kidneys than the drug itself. (I just learned this now, and I need to watch this because of my meds. I've sometimes peed what looked like tea. Shit suddenly got real, yikes)