Can I inject topical benzocaine 20% myself?

Definitely not. Dont ever do this. Benzocaine is very toxic to the heart and may cause cardiacarrest. When given topically, within reasonable limits, the concentrations in the blood stay low. Injected, however, a sudden spike in serum concentration may be harmful.

Related Questions

Can I inject topical benzocaine?

Not a good idea. What for? Drugs like Benzocaine do not have sytemic pain benefits and are meant for local use. They can induce cardiac arrythmias. Read more...
Complications. If you inject anything, be aware that skin applied meds are not manufactured to the purity standards of injectable meds. Such action would not be as bad as injecting swamp water but the risk would be there for infection. The fact that this could trigger a heart rhythm disturbance & kill you would also be worth considering. You might get lucky & not have a problem, but don't bet on it. Read more...