Penciclovir: Side Effects, Uses & Monitoring
Denavir (penciclovir cream) is indicated for the treatment of recurrent herpes labialis (cold sores) in adults and children 12 years of age and older.
- Data source
- FDA labeling via NIH DailyMed (label 2673e4a2…)
- Label version
- current
- Last reviewed
- 2026
Reported adverse reactions
Reactions listed in current FDA labeling, with the highest frequency reported across summarized placebo-controlled trials.
| Adverse reaction (as reported in labeling) | Reported frequency* |
|---|---|
| Application site reaction | 1.8% |
| Hypesthesia/local anesthesia | 1.4% |
| Taste pervesion | 0.3% |
| Puritus | 0.3% |
| Pain | 0.1% |
| Rash (erthematous) | 0.1% |
| Allergic reaction | 0.1% |
*Highest percentage reported for the active moiety across placebo-controlled trial tables in current FDA labeling. Values reflect trial reporting, not your individual risk.
Labeled uses (from FDA prescribing information)
Denavir (penciclovir cream) is indicated for the treatment of recurrent herpes labialis (cold sores) in adults and children 12 years of age and older.
Frequently Asked Questions
What is Penciclovir used for?
FDA labeling lists the approved uses shown above under "Labeled uses." This summary is informational; only a qualified prescriber can determine whether a medication is appropriate for you.
What are the most commonly reported side effects of Penciclovir?
The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for Penciclovir. Individual risk varies.
Does Penciclovir require lab monitoring?
Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking Penciclovir.
Where does this information come from?
All clinical facts on this page were extracted from the current FDA-registered product labeling for this ingredient, published by manufacturers through NIH DailyMed. See the source link below.
Medical disclaimer: Educational content extracted from public FDA labeling. Not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.