These Sildenafil tablets have been hit and miss for me - they are certainly not a cure all. First night I ended up taking 150mg - even though I ordered 100mg tablets, I split them all into 50mgs. There reason I took 150mgs was because I could feel nothing happening, and it didn't, until the next day when I had serious heartburn, but I was feeling aroused like I had not for a while.
The next morning, there was no problem getting 'erect', and then a few days later, I took 100mg about 6 hours before, and had no problem performing. A few days later I took another 100mg about 6 hours before, and again nothing happened, so that's what I say about hit and miss.
These Sildenafil tablets certainly do 'something', but they cannot be relied upon for me. Just watch out for the heartburn if taking 100mg & above, as it can be harsh for the day after.
I'll continue to use them, as they definitely do something, but just not always, but there is definitely something there - albeit I expected more.