which of the following drugs is suitable for inter nasal systemic drug delivery?

3. which of the following drugs is suitable for inter nasal systemic drug delivery?

a) morphine / since high lipophilicity

b) hyosine / avoidance from hepatic clearance

c) morphine / making long effectiveness for pain management

d) all are true

4. which one is correct?

a) isoosmatic solution are always isoto

b) isoton solution could be isoosmotic

c) for preparation od ocular formulation the formula should be isotonic with ocular fluid

d) isotonic solutions could be irritant