Dosage control generic EDs
There are big problems with fake, counterfeits, substandard and contaminated drugs manufactured overseas. You should be very careful with ED drugs, or any drugs, you buy. The drugs should be from reputable manufacturers so quality, purity and dosage are properly controlled.
I've bought Cialis in sealed packages with Eli Lilly's holograms from farmacias in Tijuana and China. They turned out just duds.
Even with genuine ED drugs, guys have been known to overdose and die of heart attacks. Some guys overdosed and got long and hard erections but could not nut. Experiment to find the minimum dosage, from each source, that you need to get reliable erection. I only use 1/8 of a generic Sildenafil for the second and third shots. That has worked adequately without fail.