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Denavir (Penciclovir)
Virtual visit

Denavir (Penciclovir)

With our quick and easy online prescription process, you can manage your health effortlessly — whether you need a first-time prescription for Denavir (Penciclovir) or a refill of an existing one.

Licensed providers in all 50 states

Expert-guided, evidence-based treatments

Skip the trip to the doctor's office

Visit options

Costs shown are for the visit only. You'll pay for medication at your preferred pharmacy.

Video Visit

$25

Est. or $100 w/o insurance

Chat Visit

$30

w/o insurance

Most insurance accepted

Board-certified

No hidden fees

Available nationwide

What is Denavir (Penciclovir)?

Denavir is a prescription antiviral cream used to treat recurrent cold sores (herpes labialis) caused by herpes simplex virus type 1. Applied directly to the affected area, it works by blocking the enzyme the virus needs to replicate its DNA—limiting the virus's ability to spread and shortening the duration and severity of the outbreak. It's applied every 2 hours while awake for 4 days, starting at the earliest sign of a cold sore such as tingling, itching, or redness. Early application gives the best chance of reducing the outbreak's impact.

Viral DNA polymerase inhibition

Penciclovir is activated by a viral enzyme (thymidine kinase) inside HSV-infected cells and then blocks the viral DNA polymerase, preventing the virus from replicating its genetic material and producing new viral particles.

Virus-selective activation

Penciclovir is preferentially activated inside herpes-infected cells rather than healthy tissue—concentrating its antiviral effect at the site of active viral replication while minimizing effects on surrounding uninfected skin.

Early-use outbreak shortening

Clinical studies show meaningful reductions in healing time, pain duration, and viral shedding when applied at the first sign of a cold sore—making prompt application at the tingle or itch stage essential for maximum benefit.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

All your care in one place. That’s the General Medicine difference.

We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
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What our customers have to say

“I feel like I’m finally on the right path to improving my health with the right support now! It’s so refreshing and reassuring.”

Emerald

“My experience with General Medicine was amazing. The understanding and care that was taken to figure out what is exactly going on with me. I feel like a weight has been lifted off of me.”

Kaylee

“I couldn’t be happier with my experience with General Medicine! They are fast, responsive, kind and knowledgeable. It is much easier, more affordable and faster.”

Nika

Get the care you need, without the wait.

Frequently Asked Questions

When should I start applying Denavir?

Apply Denavir at the very first sign of a cold sore — the tingling, itching, or burning that signals one is developing. Starting early, before the blister appears, gives the best chance of reducing severity and duration.

How often do I need to apply it?

Denavir is applied every 2 hours while awake for 4 days — starting at the first sign of the outbreak. Consistent application throughout the day is important for the medication to be effective.

Can Denavir prevent cold sores from developing?

No. Denavir is a treatment for active outbreaks — it cannot prevent them from occurring. Antiviral tablets like valacyclovir taken daily are used for suppressive therapy to reduce outbreak frequency.

What side effects might I experience?

Local reactions at the application site — redness, stinging, and a temporary numbing or altered sensation — are the most commonly reported effects. Headache has also been reported. Serious side effects are uncommon with topical use.

Can I apply Denavir inside my mouth?

No. Denavir is for external cold sore use on the lips and face only — it should not be applied inside the mouth, near the eyes, or on mucous membranes. Wash hands thoroughly after each application.
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