Is it advisable to take Viagra in a 61-year-old hypertensive patient?

Hello doctor,

I am a 61 Years old man weighing 185 pounds, a non-drinker, non-smoker, and generally in good health. I had never had an operation or been hospitalized. I work in an office, mainly sitting, and I walk about 15 to 45 minutes daily. I swim for about 5 (May to September) months every year for 30 minutes most days. I have high blood pressure. I take Irbesartan 150 mg (approved) once daily, and my blood pressure is maintained at 127/83 mm Hg (average). I have been taking this pill for about eight years. I also have a slight enlargement of the ascending aorta, and the dimensions are: ascending thoracic aorta=4.0 cm, aortic arch=2.9 cm, descending aorta=2.5 cm. These results are from a recent MRI. I also had an MRI 16 years ago, and the radiologist concluded that the above dimensions of the thoracic aorta in practice have not changed from then up until now. Taking only the Irbesartan pill has made my erection bad. A friend of mine told me that he noticed that if for one day he would not take Irbesartan that day, his erection would be better. I also noticed that for myself. Last year I used the Viagra pill 25 mg and 50 mg about once a month. The day that I used the Viagra pill, I did not take the Irbesartan pill. The erection was very good. I also noticed that the next day of having the Viagra pill, without the Irbersartan, my blood pressure was lower than average. My question now is, Is Viagra pills causing a problem with the dimension of my ascending aorta? Can the action of the pill increase the size of the aorta? Can I continue to use the viagra pill once a month (and not take the Irbesartan pill that day)? If not, what are the possible dangers to my health from using that pill? If you want to ask more questions about me, please do not hesitate to do so. Looking forward to your reply.