Longest acting anti-cholinesterase -
a) Pyridostigmine
b) Ambenonium
c) Edrophonium
d) Echothiophate
Correct Answer - D
Ans. D. Echothiophate
There are two basic categories of cholinesterase inhibitors:
- Reversible inhibitors
- Irreversible inhibitors
The reversible inhibitors produce effects of moderate duration, and
the irreversible inhibitors produce effects of long duration.
Echothiophate is irreversible inhibitor à long acting.