Peak concentration and half-life
The peak concentration of sildenafil is at 0. 5 to 2 hours while its half-life is 3 to 5 hours. So 2 hours before sex is a good bet. My goto Indian med has been Vardenafil which has a peak concentration at 0. 6 to 0. 9 hours. The half-life is similar to sildenafil. But it affects me after 15 minutes. Avanafil is faster at 0. 5 to 0. 75 hours. Half-life at 5 hours, slightly longer than the others.
Tadalafil peaks at 0. 5 to 6 hours (median 2) while its half-life is 18 hours. If the appointment is cancelled, you can reschedule for the next day! It goes quite well with Sertraline, PE med with long half-life. But the problem is, I forgot the famous side-effect when I tried it. I had butt joint pain the next day that lasted a day. It's not leg pain but pain in the butt so I really can't sit comfortably. It's not painful but it bugs you so much. I had to take a painkiller to forget about it. But the good thing is that the side effect occurs well after you have sex.
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Sildenafil alternatives chewables
Have used the Kamagra fruit chewables a few times and thought they were good. They lasted a bit longer than the normal 100 mg ones which I have used. I also ordered the fildena super active soft gel capsules. Another good alternative.