True about transdermal drug delivery system are all except?

True about transdermal drug delivery
system are all except?
a) Applied to chest, abdomen and back
b) Drug is delivered at a constant rate
c) Good option in emergency situations
d) Fentanyl is used

Correct Answer - C
Ans, C. Good option in emergency situations
The micropore membrane in transdermal patch is such that rate of
drug delivery to skin surface is less than the slowest rate of
absorption from the skin.
This offsets any variation in the rate of absorption according to the
properties of different sites. As such, the drug is delivered at a
constant and predictable rate irrespective of site of application.
Usually chest, abdomen, upper arm, lowerback, buttock or mastoid
region arc utilized.
Transdermal patches of GTN, fentanyl, nicotine and estradiol are
available in India, while those of isosorbide dinitrate, hyoscine, and
clonidine are marketed elsewhere.