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It is to done intra cavernosal between 2 o clock and 3o clock position.

intervention group received a single ICI of Botox 50 U and the control group received a single ICI of 0.9% normal saline 1 mL. To decrease the risk of systemic absorption, compression of the penile base was applied using a rubber band placed over the base of the penis before the injection and remove...

It is just a trial after all . Are the readings verified . I contacted even the clinic of Dr ghanem Egypt but they were evasive .
Botox is freely available online. Just look out.