My prostatectomy killed my sex life but penile injections (Trimix?) may help. Does anyone know a pharmacy in BKK that provides it?

 Not a "forum support' issue, moved to BKK forum.

You might want to see a doctor first before you inject stuff that "might" work 

Have a look at this:

 

https://forum.thaivisa.com/topic/1058812-trimixcaverject/

For what it is worth..

FritSikkink

I saw a doctor at Phaya Thai hosp who sent me to a doctor at Bangkok Hosp who would provide me a prescription for Trimix or something at a cost of 10,000 baht. A bit steep as in Canada it's about 2,500 baht