Penvir 250tablet

PENVIR 250 TABLET, manufactured by Hetero Healthcare Limited, is an antiviral medication prescribed for various herpesvirus infections.

Name

• Brand Name: PENVIR 250 TABLET
• Common Name: Famciclovir

Composition

Each tablet contains Famciclovir 250 mg as the active ingredient.

Uses

PENVIR 250 TABLET is primarily used to treat infections caused by herpesviruses, including:

• Herpes labialis (cold sores)
• Herpes simplex virus infections
• Shingles (Herpes zoster)
• Genital herpes infection It is also used for recurrent episodes of herpes simplex infections in individuals with HIV. The medication works by preventing the multiplication of the virus in human cells, helping to clear the infection and reduce symptoms like pain, itching, and sores.

Dosage and Administration

Take PENVIR 250 TABLET as directed by your doctor. It can be taken with or without food, preferably at a fixed time each day. Swallow the tablet whole with water; do not chew, crush, or break it. It is crucial to complete the full course of treatment, even if symptoms improve, to ensure effective viral clearance.

Side Effects

Common side effects may include headache, dizziness, nausea, vomiting, diarrhea, stomach pain, rash, itching, fatigue, and fever. Serious but rare side effects can include hives, blistering or peeling rash, yellowing of skin or eyes, unusual bruising or bleeding, loss of consciousness, fits, difficulty breathing, hallucinations, and swelling of the face, tongue, lips, or throat. Seek immediate medical attention if these occur.

Precautions

• Inform your doctor if you have kidney disease, liver disease, or problems with your immune system, as dose adjustments may be necessary.
• Use caution in elderly patients, as they may experience more side effects due to slower drug clearance.
• PENVIR 250 TABLET is generally considered safe during pregnancy if prescribed by a doctor, but it is probably unsafe during breastfeeding. Consult your doctor if you are pregnant, breastfeeding, or planning to conceive.
• This medicine may cause dizziness or drowsiness; avoid driving or operating machinery if your alertness is affected.
• If you have genital herpes, practice safe sex and avoid sexual contact when sores or blisters are present, as PENVIR 250 TABLET does not prevent transmission.
• Stay well-hydrated by drinking plenty of water during treatment to help prevent dehydration and potential kidney damage.
• Avoid taking PENVIR 250 TABLET if you are allergic to famciclovir or penciclovir.

Storage

Store PENVIR 250 TABLET below 30°C in a cool, dry place, protected from moisture, sunlight, and heat. Keep it out of the sight and reach of children.

PENVIR 250 TABLET contains the active ingredient famciclovir, an antiviral medication used to treat infections caused by herpesviruses. It is manufactured by Hetero Healthcare Limited.

What is PENVIR 250 TABLET used for?

PENVIR 250 TABLET is primarily used to treat infections caused by herpesviruses. This includes cold sores (herpes labialis), genital herpes (both initial and recurrent episodes, as well as for suppressive therapy to prevent outbreaks), and shingles (herpes zoster). It may also be used for recurrent herpes simplex infections in people with HIV.

How does PENVIR 250 TABLET work?

PENVIR 250 TABLET contains famciclovir, which is a prodrug that gets converted into penciclovir in the body. Penciclovir then works by preventing the herpesviruses (such as HSV-1, HSV-2, and VZV) from multiplying in human cells. This action inhibits viral DNA synthesis, stopping the growth and spread of the infection and helping to clear it. It does not cure herpes but helps manage symptoms like pain and itching, and promotes the healing of sores.

What is the usual dosage of PENVIR 250 TABLET?

The dosage of PENVIR 250 TABLET varies depending on the condition being treated and individual patient factors. It's crucial to follow your doctor's specific instructions.

• For Shingles (Herpes Zoster): A common dosage is 500 mg every 8 hours for 7 days, ideally started within 72 hours of the rash appearing.
• For Cold Sores (Recurrent Herpes Labialis): A single dose of 1500 mg is often prescribed, taken at the first sign of symptoms.
• For Recurrent Genital Herpes: A typical regimen is 1000 mg twice daily for 1 day, started within 6 hours of symptom onset. For suppressive therapy to prevent recurrent outbreaks, 250 mg twice daily may be prescribed.
• For Initial Episode of Genital Herpes: A common dosage is 250 mg three times a day for 7-10 days.

Dosage adjustments are necessary for individuals with kidney impairment.

What are the possible side effects of PENVIR 250 TABLET?

Common side effects may include headache, nausea, diarrhea, vomiting, stomach pain, gas, fatigue, dizziness, itchy skin, and painful menstrual periods.

Less common but more serious side effects can occur, such as kidney problems (e.g., little or no urination, swelling in feet or ankles), liver problems, low blood cell counts, confusion (especially in older adults), heart palpitations, and allergic reactions (e.g., hives, severe skin problems, difficulty breathing, swelling of the face or throat). Seek immediate medical attention if you experience severe or life-threatening side effects.

Is PENVIR 250 TABLET safe during pregnancy or breastfeeding?

• Pregnancy: Famciclovir is classified as a Pregnancy Category B drug. Animal studies have not shown a risk to the fetus, but there are not enough well-controlled studies in pregnant humans. It should only be used during pregnancy if clearly needed and after discussing the potential risks and benefits with your doctor.
• Breastfeeding: The active metabolite of famciclovir, penciclovir, may pass into breast milk and could potentially cause side effects in a breastfed infant. You should discuss with your doctor whether to stop breastfeeding or discontinue the medication, weighing the benefits and risks.

Can PENVIR 250 TABLET be taken with other medications?

PENVIR 250 TABLET does not interact with many medications, but some important interactions exist. It can reduce the effectiveness of certain live vaccines, such as the varicella virus vaccine and zoster vaccine live, and should generally be avoided 24 hours before and 14 days after receiving these vaccines. It may also interact with drugs like probenecid, potentially increasing famciclovir levels and the risk of side effects. It is generally not recommended to take famciclovir with other oral herpes antivirals like valacyclovir. Always inform your doctor or pharmacist about all other medications, vitamins, and herbal products you are taking to avoid potential interactions.

What precautions should be taken while taking PENVIR 250 TABLET?

• Underlying Health Conditions: Inform your doctor if you have kidney or liver problems, immune system issues (such as HIV/AIDS), or certain rare conditions affecting lactose tolerance, as PENVIR contains lactose.
• Driving and Machinery: This medicine may cause dizziness, confusion, or drowsiness. Do not drive or operate machinery until you know how it affects you.
• Hydration: Drink plenty of fluids while taking this medication to help prevent dehydration and potential kidney issues.
• Transmission of Infection: PENVIR 250 TABLET is not a cure for herpes and does not prevent the spread of the virus to others. You can still transmit herpes infections even while taking this medication. Practice safer sex by using condoms and avoid sexual contact during outbreaks or if you have symptoms. Avoid touching infected areas and then your eyes, and wash your hands frequently.

What happens if a dose of PENVIR 250 TABLET is missed?

If you miss a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one, as this could lead to dangerous side effects.

How should PENVIR 250 TABLET be stored?

Store PENVIR 250 TABLET in a closed container at room temperature, ideally between 20° to 25°C (68° to 77°F), away from heat, moisture, and direct light. Keep this medicine out of the reach of children and pets.