puppy having trouble peeing

Question
my 12 week old puppy is having trouble peeing. is there any over the counter meds that will help her

Answer
any puppy that age having any kind of urinary issue needs to see a vet. There is something physically wrong if she has a problem passing urine.
She could have stones or a stricture of the bladder or urethra. This is not something an OTC medicine will fix.
She needs to see the vet as soon as possible.