Penvir 500 Tablet

PENVIR 500 Tablet

PENVIR 500 Tablet is an antiviral medication manufactured by Hetero Drugs Ltd..

Composition Each film-coated tablet contains Famciclovir 500 mg as the active ingredient. Famciclovir is an oral prodrug that is rapidly converted to its antivirally active compound, penciclovir, in the body.

Uses PENVIR 500 Tablet is prescribed for the treatment of various viral infections caused by herpes viruses. It works by preventing the multiplication of the virus in human cells, thereby helping to clear the infection and reduce symptoms.

Key uses include:

• Shingles (Herpes Zoster): Including ophthalmic zoster (shingles affecting the eye or area around it).
• Genital Herpes: For treating initial outbreaks, recurrent episodes, and for suppressive therapy to prevent future attacks.
• Cold Sores (Herpes Labialis): Treatment of recurrent episodes.
• Herpes Simplex Virus (HSV) Infections: Including recurrent episodes in individuals with HIV infection.

Dosage and Administration PENVIR 500 Tablet should be taken orally, with or without food, as directed by a healthcare professional. It is usually advised to take it at the same time each day for consistency. The dosage and duration of treatment vary depending on the condition, the patient's immune status, and kidney function.

• For Shingles (immunocompetent adults): Typically, 500 mg three times daily for seven days.
• For first episode of Genital Herpes (immunocompetent adults): 250 mg three times daily for five days.
• For recurrent Genital Herpes (immunocompetent adults): 125 mg twice daily for five days, or 1000 mg twice daily for 1 day.
• For suppression of recurrent Genital Herpes (immunocompetent adults): 250 mg twice daily.
• For immunocompromised patients: Dosage adjustments, often higher or longer duration, may be necessary. For instance, 500 mg twice daily for seven days for recurrent genital herpes, or 500 mg three times daily for ten days for shingles.

It is crucial not to skip doses and to complete the full course of treatment.

Side Effects Common side effects may include:

• Headache
• Dizziness
• Nausea or vomiting
• Diarrhea
• Fatigue
• Rash or itching
• Abdominal pain

More serious, though less common, side effects can include signs of a serious allergic reaction (skin rash, itching/swelling, severe dizziness, breathing difficulty), yellowing of the skin/eyes (jaundice), or a decrease in blood platelets. Consult a doctor if side effects persist or worsen.

Precautions

• Allergies: Do not take if allergic to famciclovir, penciclovir, or any other ingredients.
• Kidney and Liver Impairment: Use with caution. Dose adjustment may be required in patients with kidney problems, as the medicine is filtered by the kidneys. There is limited data for severe hepatic impairment.
• Immune System: Inform your doctor if you have a compromised immune system, as dose adjustments may be needed.
• Pregnancy and Breastfeeding: PENVIR 500 Tablet is a Pregnancy Category B medicine. It should be used during pregnancy only if clearly needed and under medical supervision. Caution is advised during breastfeeding.
• Alcohol: Caution with alcohol consumption, as it may increase the risk of side effects like drowsiness.
• Driving and Operating Machinery: May cause dizziness, drowsiness, or confusion; avoid activities requiring concentration if affected.
• Hydration: Drink plenty of water during treatment to prevent dehydration and potential kidney damage.
• Transmission: While PENVIR 500 Tablet can reduce viral shedding, it does not prevent the transmission of herpes. Safer sex practices are recommended, and sexual contact should be avoided when symptoms are present.
• Pediatric Use: Not recommended for children below 18 years due to lack of safety and efficacy data.

Storage Store PENVIR 500 Tablet below 30°C in a clean, dry place, protected from moisture, sunlight, and heat. Keep out of the sight and reach of children and pets.

PENVIR 500 Tablet, manufactured by Hetero Drugs Ltd., contains the active ingredient Famciclovir, which is an antiviral medicine. It is used to treat infections caused by herpes viruses.

What is PENVIR 500 Tablet used for?

PENVIR 500 Tablet is an antiviral medicine used to treat various infections caused by herpes viruses. These include shingles (herpes zoster, which causes painful rashes and blisters on the skin), cold sores (herpes labialis, small painful blisters around the mouth or face), and genital herpes (a sexually transmitted infection causing sores in the genital and anal area). It is also prescribed for recurrent episodes of herpes simplex infections in individuals with human immunodeficiency virus (HIV) infection. This medicine helps to reduce symptoms, heal sores, and decrease the severity of the condition, though it does not cure the infection or prevent its spread to others.

How does PENVIR 500 Tablet work?

PENVIR 500 Tablet contains Famciclovir, which is a prodrug that gets converted into its active form, penciclovir, inside the body. This active compound works by slowing down the growth and multiplication of herpes viruses in human cells. It achieves this by blocking an enzyme essential for the synthesis and replication of viral DNA, thereby helping to clear the infection.

What is the usual dosage for PENVIR 500 Tablet?

The dosage of PENVIR 500 Tablet varies depending on the specific viral infection being treated, the patient's immune system status, and kidney function. It should always be taken exactly as prescribed by your doctor. Generally, for shingles in immunocompetent adults, a common dosage is 500 mg every eight hours for seven days. For recurrent genital herpes, treatment might involve 1000 mg twice daily for one day, or 250 mg twice daily for suppressive therapy. For recurrent cold sores, a single dose of 1500 mg might be prescribed. For HIV-infected adults with recurrent orolabial or genital herpes, the dosage is typically 500 mg twice daily for seven days. This medicine can be taken with or without food, but it's advisable to take it at the same time each day for consistent blood levels.

What are the possible side effects of PENVIR 500 Tablet?

Common side effects associated with PENVIR 500 Tablet include headache, nausea, diarrhea, stomach pain, dizziness, vomiting, fatigue, rash, itching, and painful menstruation. If these side effects persist or become severe, you should consult your doctor. More serious, though rare, side effects can include signs of an allergic reaction (such as skin rash, itching, swelling of the face/tongue/throat, or breathing difficulty) or indications of kidney problems (like confusion, little or no urination, or swelling in the feet/ankles), especially with inappropriate dosing in individuals with underlying kidney issues.

Is PENVIR 500 Tablet safe during pregnancy or breastfeeding?

During Pregnancy: PENVIR 500 Tablet (Famciclovir) is categorized as a Pregnancy Category B medicine. While animal studies have not shown a risk to the fetus, there are limited controlled studies in pregnant humans. It is generally considered safe if prescribed, but should only be used if clearly needed, and often, acyclovir is considered a first-line alternative during pregnancy.

During Breastfeeding: It is not known whether famciclovir or its active metabolite, penciclovir, is excreted into human milk. Animal studies indicate penciclovir is present in breast milk. PENVIR 500 Tablet is generally not recommended for breastfeeding mothers unless the potential benefits significantly outweigh the potential risks to the infant. A doctor's advice is crucial in this situation, and acyclovir is often preferred for breastfeeding mothers.

Can PENVIR 500 Tablet be taken with other medications?

PENVIR 500 Tablet can generally be taken with antibiotics or pain medications. However, it is not recommended to take it concurrently with other oral antiviral medications for herpes, such as valacyclovir, as this does not offer additional benefits and may increase the risk of side effects. PENVIR 500 Tablet can also reduce the effectiveness of certain vaccines, including chickenpox vaccines (Varivax, ProQuad) and zoster vaccine live, and it is advised to stop famciclovir 24 hours before receiving these vaccines. Additionally, medications like probenecid may increase the concentration of famciclovir in the blood. Always inform your doctor about all prescribed and over-the-counter medications, vitamins, and herbal supplements you are taking to avoid potential interactions.

What precautions should be taken while taking PENVIR 500 Tablet?

Do not take PENVIR 500 Tablet if you are allergic to famciclovir, penciclovir, or any of its ingredients. Use caution if you have severe kidney or liver disease, as your doctor may need to adjust the dosage. This medication can cause dizziness, drowsiness, or confusion, so avoid driving or operating heavy machinery if you experience these effects. It's important to drink plenty of water while on this treatment to prevent dehydration and potential kidney damage. Do not stop taking the medicine suddenly without consulting your doctor, even if you feel better, as this can lead to a recurrence or worsening of the infection. If you have genital herpes, practice safe sex by using condoms and avoid sexual contact when lesions are present to prevent transmission to your partner. PENVIR 500 Tablet is not generally recommended for children under 18 years of age due to limited safety and efficacy data.

What happens if a dose of PENVIR 500 Tablet is missed?

If you miss a dose of PENVIR 500 Tablet, 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 the missed one, as this can increase the risk of side effects.

How should PENVIR 500 Tablet be stored?

PENVIR 500 Tablet should be stored in a cool and dry place, away from direct sunlight, and out of the sight and reach of children.