In which of the following dosages is acyclovir prescribed for herpes labialis?

a. 200 mg q 4h
b. 300 mg q id
c. ointment 5% q 3 h 3 7 days
d. ointment 10% 6 times/day 3 10 days

c. Topical acyclovir is best prescribed for herpes labialis. The ointment is supplied as a 5% formulation. Treatment should be started as soon as possible after onset of symptoms.