Like you, I think that it is unlikely that the Mexican ED pill would give you long term erection problems. However, one does not really know for sure what was in that tablet, since it was non-prescription and not regulated by U.S.A. FDA. It is best not to experiment with any kind of supplements or drugs even in U.S.A. I am inclined to think that your situation is caused by a side affect of your blood pressure medication you mentioned or any other health problems or medications that you haven't mentioned.