Internal And External Solutions

Question 1

What is a vehicle

Answer 1

The solvent that makes up the continuous phase of the formulation, and which dissolves the drug, with more than one co-solvent often being required.

E.g. water , syrup BP , alcohol

Question 2

What are preservatives

Answer 2

Prevents bacterial growth in water phase

E.g. benzoic acid, ethanol

Most common - double strength chloroform or chloroform spirit