This is definitely a medication issue. It is posted on several websites. I myself am male and have had the exact same issues. I am only in my early 30s and do NOT have any prostate issues. This is a vascular issue. Vyvanse is a vascular restrictor which by nature shrinks your veins and and blood flow increases faster and your circulatory system increases pumping you up more. This increases your adrenaline and hence the reason your urine does not come out fast because your tense and in fight or flight mode and not when your body is expecting to take a piss, even though your bladder is full. Surprisingly you actually have to relax to piss. I only take Vyvanse when needed so I am NOT a regular user, just when I have deadlines to meet or need the extra focus working on projects etc. and those are the ONLY days I have trouble urinating. This is 100% linked to the medication, however I do not rule out others that could have a prostate issue if you are of that age. I used to take focalin also and I do not ever recall having the same issue, but I may not have been paying attention to it either (no pun intended since I have ADD).
REPORT ABUSE
