As I've gotten older, I've found that it's becoming more challenging to maintain the same level of performance as I had as a young man. I've seen some guys just give up and let their sex life go as they get old, but I put enough value on this part of my life that I'll do anything I can to hang on to it. One of the things that I can control is how my body works with the right medications. I've had one of my therapists, who gave me acoustic shockwave therapy treatments, suggest that I would benefit from adding nitric oxide boosters to my medication regime. I've tried one that didn't appear to be improving things, but I'm now using an new product on a trial basis, called BloodFlow-7 from Juvenon. It claims improvements in vasodilation and blood circulation that are beneficial to penile erection, and do so with natural ingredients such as L-Argenine and L-Citruline. My main concern has been how nitric oxide boosters might interact with medication such as tadalafil (Cialis) and sidalafil (Viagra). I've chosen, with my doctor's advice, to control my Benign Prostatic Hyperplasia (enlarged prostate) using small doses of tadalifil (5 mg daily) on the assumption that I'm not only treating my BPH, but also doing so in a way that won't impair my sexual ability in the way drugs such as FlowMax might. It works extremely well. But, you'll hear it suggested that oral PDE5 treatments such as tadalafil and sidalafil are incompatible with nitric oxide supplements, which could cause low blood pressure. My interpretation of the information I've been able to gather is that they shouldn't be combined indiscriminately, but if the nitric oxide boosters are consumed in the morning and the oral PDE5 inhibitor (tadalafil/Cialis) is consumed in the evening, it can be an acceptable medication regime. This is working well for me.....I would urge you to consult your personal doctor before following my layman's advice. At this point, I seem to have found what works for me.....Morning nitric oxide booster, evening 5 mg Cialis, and bi-weekly 1.25 ml bi-weekly testosterone injections. I can become erect and masturbate successfully multiple times each day and I'm enjoying sex in my seventies, still enjoying an important part of life that some of my friends gave up ten or even twenty years ago.