When Prescribing Topical Penciclovir (Denavir) for the Treatment of Herpes

When prescribing topical penciclovir (Denavir) for the treatment of herpes labialis (cold sores) patient education would include:

A) Spread penciclovir liberally all over lips and the area surrounding lips.
B) Penciclovir therapy is started at the first sign of a cold sore outbreak.
C) Skin irritation is normal with penciclovir and it should resolve.
D) Penciclovir should be used a minimum of two weeks to prevent recurrence.