When your catheter has been removed, it is likely that you will have bladder leakage and this could be quite heavy at first. Men often say that they were not warned about this and did not expect it. There are some things that you might like to do in advance to get yourself prepared:
If you are in the UK you can order a Prostate Cancer UK surgery support pack. This contains samples of absorbent pads, disposal bags, hand wipes and written information on surgery and urinary problems after surgery. You may be given one by your Urology nurse specialist or you can contact PCUK directly to get your pack.
In the UK you can contact your local continence advisory service where specialist nurses can give you product advice, they may be able to tell you in advance if you will be able to get incontinence pads through them after your treatment. You can either speak to your GP and ask for a referral or contact them yourself. Contact the Bladder and Bowel foundation 01536 533255 to find the clinics in your area.
Check out your local supermarket and pharmacy to see the range of absorbent pads that are available. Buy a pack of larger more absorbent pads and smaller lighter absorbency pads (shaped pads for men are a popular product that perform well). It is impossible to know how much urine you will leak, but it is likely that your leakage will be quite heavy at first and should then become lighter.
Consider getting some samples of urinary sheaths, which are an alternative to pads for men with bladder leakage. Many manufacturers will give free samples and give you advice on the right product to use. If you have a shortened or retracted penis, which can be a side-effect of prostate cancer, there are sheaths and products specifically designed for this purpose.