✅ Treats Viral Infections
✅ Reduces Cold Sore Duration
✅ Alleviates Shingles Symptoms
✅ Prescribed Antiviral Medication
✅ Oral Medication Option

Penvir contains Famciclovir.

Product Overview

Penvir is a medication containing the active ingredient Famciclovir. It belongs to a class of antiviral drugs known as nucleoside analogues, specifically designed to treat viral infections caused by the herpes simplex virus (HSV) and varicella-zoster virus (VZV). Famciclovir works by inhibiting the replication of the virus, thereby reducing the severity and duration of symptoms associated with herpes outbreaks. It is available in oral tablet form for convenient administration.


Penvir is primarily used to treat infections caused by HSV, including genital herpes, cold sores, and shingles (herpes zoster). It is also effective in the treatment of herpes simplex encephalitis, a rare but serious infection of the brain caused by HSV. Additionally, it can be prescribed for the prevention of recurrent genital herpes outbreaks in individuals with frequent recurrences.

How to Use

Penvir tablets should be taken orally with a full glass of water, with or without food, as directed by a healthcare professional. The dosage and duration of treatment may vary depending on the type and severity of the infection being treated. It is important to complete the full course of treatment as prescribed, even if symptoms improve before the medication is finished. It is most effective when taken at the earliest sign of a herpes outbreak.

How it Works

Famciclovir, the active ingredient in Penvir, works by inhibiting the activity of viral enzymes necessary for the replication of the herpes virus. Once inside the body, famciclovir is converted into its active form, penciclovir, which interferes with the viral DNA synthesis process. By preventing the virus from replicating and spreading to healthy cells, it helps control the infection and reduce the severity and duration of symptoms associated with herpes outbreaks.

Dosage and Administration

The recommended dosage of Penvir for the treatment of genital herpes and cold sores is typically 250 mg three times daily for 7 to 10 days. For the treatment of shingles (herpes zoster), the recommended dosage is 500 mg every 8 hours for 7 days. It may also be prescribed for suppressive therapy to prevent recurrent genital herpes outbreaks, with a typical dosage of 250 mg twice daily for up to 1 year.


  1. Effective treatment for genital herpes, cold sores, and shingles.
  2. Reduces the severity and duration of herpes outbreaks.
  3. Can be used for the prevention of recurrent genital herpes outbreaks.
  4. Convenient oral tablet formulation.
  5. Well-tolerated with few side effects.

Common Side Effects

Common side effects of it may include headache, nausea, diarrhea, and abdominal pain. These side effects are usually mild and temporary, resolving on their own as the body adjusts to the medication. In rare cases, Penvir may cause allergic reactions, including rash, itching, and swelling of the face, lips, or tongue. If you experience any severe or persistent side effects, seek medical attention promptly.


Before using Penvir, inform your healthcare provider if you have a history of kidney disease or liver disease, as dosage adjustments may be necessary. It may interact with certain medications, including probenecid and nephrotoxic drugs, so it is important to disclose all medications you are currently taking. It is not recommended for use during pregnancy or breastfeeding unless directed by a healthcare professional.

Storage Information

Store these tablets at room temperature, away from moisture and heat. Keep the medication out of reach of children and pets. Do not use Penvir past the expiration date printed on the packaging. If you have any unused or expired medication, dispose of it properly according to local regulations for pharmaceutical waste disposal.


Our sole intention is to ensure that its consumers get information that is expert-reviewed, accurate, and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover all possible side effects, drug interactions, or warnings or alerts. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Additional Information


250 mg, 500 mg


18 Tablet/s, 36 Tablet/s, 54 Tablet/s, 108 Tablet/s


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