Tears are a method for the eye to flush out foreign matter

When the maximal response to a drug reaches the ceiling, it can become toxic, especially to the:

a. Liver and kidneys. b. Excretory function of the cells. c. Cell membranes. d. Urinary tract.

Which decongestant should not be used at the same time as the herbal medication ephedra or with tricyclic antidepressants?

A) Naphazoline B) Phenylephrine C) Oxymetazoline D) Xylometazoline