don't throw away your "underpowered" stun gun, it might not be effective to put someone down, but there is a different way you could use one, i,ve read somewhere that electricity brakes up poison, (as in poisonous insects, animals bites, not if you ingest something poisonous) at first i was sceptical about it, but once i had was in a forest in a black fly season, had about 50 bites, in few days they swell to about a small pee size, so i took my zapping cigarette "practical joke kit" and zapped each bite few times, 1-2 seconds each zap, in few hours itching and pain was gone, in a few days swelling was gone, in a week there was no traces left, others who were with me and got bitten, used cortisone, and other ointments, their bites were gone only in about a month.
i don't have solid scientific data that zapping cured the bites, but what i,ve seen happened made me believe it did help, now i use this zap cig pack on every mosquito bite i get, itching goes away fast.
now if i ever get bitten by a poisonous snake, i would not hesitate to stun my self. it sure wont make things worst, but very big chance it will help.
not that i tell everyone to zap themselves, but it works for me, it is one more thing to consider.