Huh? Could you elaborate on the no-mix part? I thought they were essentially the same thing (sidenafil and tadalafil), well, not exactly the same, but causing the exact same effect to the body, just with different release timeframes (~day vs ~few hours). It’s not like bleach+vinegar thing? All the info I could find on dangers of mixing the two boils down to what is effectively an overdose, which you can achieve with either single one of them, by just chugging the whole pack at once.