Yes, trouble urinating is probably without a doubt THE most common side-effect from ALL opiates
/opioids.. it seems to be pretty much unavoidable. Patience is needed here, since swim
sometimes has to spend up to 30 minutes in the bathroom before he can squeeze some out..
But of course, there are some tricks that usually helps quite alot..
sitting down, like someone mentioned is one..doing this in combination with having one hand under cold or hot water running from the tap while massageing the bladder and switching between relaxing and "pushing" can help. Also, when swiy is sitting down and doing said massageing, leaning forward as much as possible can sometimes help aswell.
If this wont work, take of swiys clothes and sit down in the bathtub in a squatting position while rocking swiys body as if in a rocking chair while spraying water on your genitals almost always works very well for swim. Sure, it may seem a bit humiliating position to be in... but this is the life swim & swine has chosen and also, people gotta pee!!