I have searched Pubmed using every different variation of the above, and only a few studies pop-up regarding the effects of long-term use and building resistance. Some indicate that the body does not build resistance to PDE-5 inhibitors, while some speculate that is might occur. Some studies suggest that it is the organic factors that worsen, thus requiring a higher dose (i.e., more endothelial damage from lifestyle), not the body building resistance.
So, how long have some of you been using these and have you had to markedly increase the dose to achieve the same effect over time?
Two studies from PeakT's website, but both have many variables:
http://www.jurology.com/article/S0022-5347(05)65866-1/abstract
http://www.ncbi.nlm.nih.gov/pubmed/16611151
So, how long have some of you been using these and have you had to markedly increase the dose to achieve the same effect over time?
Two studies from PeakT's website, but both have many variables:
http://www.jurology.com/article/S0022-5347(05)65866-1/abstract
http://www.ncbi.nlm.nih.gov/pubmed/16611151