Your concern involving the use of Cialis and Viagra has some merit. However, my use of Viagra and l-argenine is not a problem with my Endocrinologist, who I see quarterly for a check-up. Since I added the daily use of Cialas, I have reduced my Viagra dosage to 50 mg and use it less often since I started using Trimix injections, which has been approved to be used in combination with other ED medications. With regard to Trimix, I am under the care of a Urologist.
I appreciate your concern, but I believe that after 15 years of treating my ED, I know what I am doing. Not only that, but being deprived of satisfying sex for 15 years, I am entitled to take some limited risk in order to enjoy satisfying intimate relationships with my wife of over 40 years. And, so is she. Based on life expectancy charts, I only have about 10 years left and I want to enjoy them and personally feel I will be enjoying them well beyond my life expectancy.
Anyway, this thread was intended to discuss the safety of taking Viagra/Cialis with l-argenine. Based on my personal experience, it should not be an undue risk. Further, my endocrinologist is fully aware I am combining the two and has not voiced a concern, though he admits he is not an expert in herbal supplements.