HI, thanks for using healthcare magic

As you stated the diabetes , weight and prostate may also be playing a role in erectile dysfunction.

If the viagra is no longer working, you can either go up to the maximum allowed dose if you are at a lower dose or try one of the alternative medications.
Cialis or levitra can be tried, it is possible that you may have a better response.

If these are not effective, an urologist can provide alternatives to medications.

I hope this helps

Cause of erectile dysfunction in a Diabetic is neuropathy .Over weight in Diabetics is dangerous that too is responsible fo erectile dysfunction. Third Problem is Enlarged prostate.If i have to treat a patient of diabetes with these diseases who comes to my clinic I will advise him for investigations Blood sugar lipid profile Psa and ultrasound scan of lower abdomen. If I have to treat such a patient I will advise him for Diabetes injection insuline depending upon blood sugar report subcutetaneously twice a day, Tab atorvastin 10mg orally daily cap Bcomplex 2caps three times a day Tab pentoxyphylline 400mg three times a day and for prostate enlargement cap tamulsin 4mg and finasetride 5mg.After one month or so Tab tadafil 20 i will add . Reduce wieght by strict diet control no sugar no ghee plenty of vegetables and some fruits, long walk and excercise are must for a diabetic