I am a YOUNG MAN of 65 & have good sexual urge but unable to perform properly due to ERECTILE DYSFUNCTION. Although I get quite good Pre-Cum & Lubrication in the foreplay.I have this ED Problem since last about 8/10 years.Earlier I had been using Sildennafil 50 mg (on SOS basis only) and I could overcome the problem to a reasonable extent though it used to have some temporary side effects also.However since last about 2 years I am unable to get hardly any ERECTION with this tablet & even by watching porn etc.The quantity of EJACULATE has also reduced considerablly to about 4/5 drops only.Now coming to my MEDICAL CONDITION,I have ATRIAL FIBRILLATION & HYPERTENSION since last about 10 years but is under good control with medications like BETA BLOCKER (Presently using CARVISTAR 3.25 mg 1 BD & LANOXIN 0.25 mg half Tab OD 5 days a week) & BLOOD PRESSURE (TELMESARTAN 80 H) DRUGS.I had undergone TURP SURGERY in April, 2010 & the enlarged portion of PROSTATE was removed. Further I had also undergone CORONARY ANGIOPLASTY IN OCT,2012 for 1 blockage in 1 artery after which I am also on DUAL ANTI PLATLET THERAPY (ASPIRIN & CLOPIDUGERAL) and also STATIN for Cholestrol Control .Fortunately I am NOT DIABETIC so far and. I feel my ED problem though could partly be AGE RELATED but I think it is mainly due the above medications which I have been taking for so many years.Please let me know what is your DIAGNOSIS of my ED problem & can you prescribe any effective but safe medications in view of my CARDIAC CONDITION.My Cardiologist has advised NOT TO USE SILDENAFILL. Thanks & Regards.