The spring loaded injector (or at least the ones I have seen) would be an extra. The only thing to watch for is that some (most?) auto-injectors are designed for particular brands of syringes.
You won't have to hang around the office. If the worst (!) happens, just tuck it into your waistband like you used to. Make sure you wear loose fitting clothing or a jacket so you avoid scaring women and horses.
No symptoms; PSA 5.7; Gleason 4+5=9; cancer in 4/12 cores
Non-nerve-sparing RRP 7 March 2008 age 63
Organ confined, neg margins. Gleason downgrade 4+4=8
Bimix worked well; now using just VED
PSA undetectable at first but then rose to 0.4, doubling time 7 months
Following diet change, PSA static at 0.4...