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Q: Isotonic Vehicle used to prepare ophthalmic solution:
  • A. Benzalkonium chloride
  • B. Polysorbate 20
  • C. Dioctyl sodium
  • D. 1.9% Boric acid
Correct Answer: Option D - Ophthalmic preparations are must be isotonic with lachrymal secretions to avoid discomfort and irritation. 1.9% Boric acid and sodium phosphate buffer are commonly used as isotonic vehicle.
D. Ophthalmic preparations are must be isotonic with lachrymal secretions to avoid discomfort and irritation. 1.9% Boric acid and sodium phosphate buffer are commonly used as isotonic vehicle.

Explanations:

Ophthalmic preparations are must be isotonic with lachrymal secretions to avoid discomfort and irritation. 1.9% Boric acid and sodium phosphate buffer are commonly used as isotonic vehicle.