it depends on the type of medication (you did not mention the name) the size of your prostate and of course your individual response to that medication. there are just too many variables to be able to determine low long a person might take to experience a beneficial effect.
if medication for prostate is increased does it take 6mos for affect. started taking medicine for inlarge prostate april of 2013 2mg of finasteride. doctor increased doses to 5mg of same medication in april of 2014. does it still take 6mos or longer for new doses to take affect