Generic Zovirax ( Acyclovir )

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Zovirax is used for the treatment of herpes simplex virus (HSV) infections, including genital herpes, cold sores, shingles (herpes zoster), and chickenpox (varicella). The medication is a nucleoside analogue antiviral that inhibits viral DNA synthesis by interfering with viral DNA polymerase, stopping viral replication and reducing the severity and duration of outbreaks.
The usual dosage of Zovirax varies by condition: for genital herpes, 200 mg every 4 hours (5 times daily) for 10 days; for shingles, 800 mg every 4 hours (5 times daily) for 7‑10 days; for chickenpox, 20 mg/kg (up to 800 mg) 4 times daily for 5 days. Suppressive therapy for recurrent genital herpes: 400 mg twice daily.
The administration form is tablets (200 mg, 400 mg, 800 mg), capsules, or oral suspension.
The effect of the medication begins within 1‑2 days of starting treatment, with symptom relief typically within 5‑7 days.
The duration of action is typically 5‑10 days for acute outbreaks, or long‑term for suppressive therapy.
Alcohol consumption is not recommended during treatment, as it may worsen side effects and reduce immune function.
The most common side effects are nausea, diarrhea, headache, and dizziness.
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Basic Zovirax Information

• INN (International Nonproprietary Name): Acyclovir
• Brand names available in USA: Zovirax®, Sitavig® (buccal tablet)
• ATC Code: J05AB01
• Forms and dosages: Tablets (200 mg, 400 mg, 800 mg), capsules (200 mg), oral suspension (200 mg/5 mL), topical cream (5%), intravenous injection
• Manufacturers in USA: GlaxoSmithKline (Zovirax), generics (Teva, Mylan, Sandoz, etc.)
• Registration status in USA: Approved by FDA
• OTC / Rx classification: Prescription only (Rx) for oral and IV forms; topical cream available over‑the‑counter (OTC)

Mechanism and Pharmacology

Zovirax contains acyclovir, a synthetic nucleoside analogue that is selectively converted to acyclovir monophosphate by the viral thymidine kinase of herpes simplex virus (HSV) and varicella‑zoster virus (VZV). This conversion occurs preferentially in infected cells. Acyclovir monophosphate is further metabolized by cellular kinases to acyclovir triphosphate, which competitively inhibits viral DNA polymerase and is incorporated into viral DNA, causing chain termination and preventing further viral replication. Acyclovir has little effect on host cellular DNA synthesis, making it a highly selective antiviral agent.

Indications and Usage

Zovirax is indicated for:
- Treatment of initial and recurrent episodes of genital herpes in adults and children.
- Treatment of herpes simplex labialis (cold sores) in adults and children.
- Treatment of herpes zoster (shingles) in immunocompetent adults.
- Treatment of varicella (chickenpox) in immunocompetent children and adults.
- Suppression of recurrent genital herpes in immunocompetent patients.
- Treatment of herpes simplex infections in immunocompromised patients (e.g., HIV‑positive individuals, transplant recipients).
It is also used off‑label for herpes simplex encephalitis (IV form) and neonatal herpes.

Critical Warnings and Limitations

High‑Risk Groups
Elderly: Dose adjustment is required in elderly patients with reduced renal function; start with lower doses and monitor for neurotoxicity (confusion, agitation).
Pregnancy: Acyclovir is classified as FDA Pregnancy Category B. Studies have not shown an increased risk of birth defects. Use during pregnancy only if clearly needed. The Acyclovir Pregnancy Registry has not identified an increased risk of major malformations.
Breastfeeding: Acyclovir is excreted in human milk in low concentrations; caution is advised, but it is generally considered compatible with breastfeeding.

Activity Interactions
Driving: May cause dizziness or drowsiness – exercise caution when operating vehicles or machinery.
Alcohol: Avoid alcohol consumption as it may worsen side effects and impair immune response.

Dosage Guide

Standard Regimens
Genital herpes, initial episode: 200 mg every 4 hours (5 times daily) for 10 days, or 400 mg 3 times daily for 7‑10 days.
Genital herpes, recurrent episodes: 200 mg every 4 hours (5 times daily) for 5 days, or 800 mg 3 times daily for 2 days (short‑course).
Genital herpes, suppressive therapy: 400 mg twice daily for up to 12 months, then re‑evaluate.
Herpes zoster (shingles): 800 mg every 4 hours (5 times daily) for 7‑10 days.
Chickenpox (varicella): 20 mg/kg (maximum 800 mg) 4 times daily for 5 days, starting within 24 hours of rash onset.
Herpes simplex labialis (cold sores): 400 mg 3 times daily for 5 days, or 200 mg 5 times daily for 5 days.
Renal impairment: Dose adjustment based on creatinine clearance (CrCl):
- CrCl 25‑50 mL/min: normal dose every 12 hours.
- CrCl 10‑25 mL/min: normal dose every 24 hours.
- CrCl

Special Populations
Pediatric: Dosing based on body weight and age; refer to prescribing information.
Geriatric: Monitor renal function and adjust dose accordingly.

Side Effects and Contraindications

Common side effects:
- Nausea
- Diarrhea
- Headache
- Dizziness
- Fatigue
- Vomiting
- Abdominal pain

Serious side effects requiring medical attention:
- Severe allergic reactions (rash, hives, swelling of the face/lips/tongue, anaphylaxis)
- Neurotoxicity (confusion, hallucinations, agitation, seizures) – more common in elderly or renally impaired patients
- Acute kidney injury (especially with IV administration or dehydration)
- Thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (TTP/HUS) – rare, mainly in immunocompromised patients
- Severe skin reactions (Stevens‑Johnson syndrome, toxic epidermal necrolysis)

Absolute contraindications:
- Hypersensitivity to acyclovir or valacyclovir (Valtrex).
- Known intolerance to any excipient in the formulation.

Drug Interactions

Significant interactions include:
- Probenecid: Increases acyclovir half‑life and plasma levels by inhibiting renal tubular secretion; dose reduction may be needed.
- Zidovudine (AZT): Concurrent use may cause increased drowsiness and lethargy; monitor for CNS toxicity.
- Nephrotoxic drugs (e.g., NSAIDs, aminoglycosides, cyclosporine, tacrolimus): Increased risk of acute kidney injury; monitor renal function.
- Mycophenolate mofetil: May increase acyclovir levels; monitor for toxicity.
- Live vaccines (varicella, zoster): Avoid concurrent use; acyclovir may reduce immune response to live vaccines.

Practical Guidelines

Administration
Take Zovirax with a full glass of water. Drink plenty of fluids to maintain hydration and prevent kidney damage. Swallow tablets whole; do not crush or chew. May be taken with or without food (food may reduce gastrointestinal upset). For cold sores, start treatment at the first sign of symptoms (tingling, itching). For suppressive therapy, take exactly as prescribed, even between outbreaks. If a dose is missed, take it as soon as remembered unless it is near the next dose; do not double dose.

Monitoring
Regular monitoring required for long‑term suppressive therapy or in patients with renal impairment:
- Renal function (serum creatinine, BUN) at baseline and periodically
- Neurological status (especially in elderly or renally impaired patients)
- Complete blood count (rarely needed)

Storage
Store at room temperature (20‑25°C / 68‑77°F), away from moisture and heat. Keep tablets in original container, tightly closed. Do not store in the bathroom. Oral suspension should be stored at room temperature; discard unused portion after 14 days.

Alternative Medications

• Valacyclovir (Valtrex): Prodrug of acyclovir with higher oral bioavailability, taken less frequently (e.g., twice daily).
• Famciclovir (Famvir): Prodrug of penciclovir, also effective against HSV and VZV, with convenient dosing.
• Penciclovir (Denavir) cream: Topical treatment for cold sores.
• Docosanol (Abreva) cream: Over‑the‑counter topical agent for cold sores.
• Lysine supplements: Limited evidence for prevention of herpes recurrences.

Clinical Effectiveness

Acyclovir has been the standard of care for herpes virus infections for over three decades. In initial genital herpes, acyclovir reduces the duration of lesions by 2‑3 days and viral shedding by 80‑90%. For shingles, acyclovir accelerates rash healing, reduces acute pain, and may reduce the risk of postherpetic neuralgia when started within 72 hours of rash onset. In suppressive therapy, acyclovir reduces the frequency of genital herpes recurrences by 70‑80%. Resistance to acyclovir is rare in immunocompetent patients but may occur in immunocompromised individuals.

Important: Zovirax requires medical supervision and should only be used under prescription. Do not stop treatment early, as this may allow the infection to recur or worsen. Complete the full course as prescribed, especially for initial episodes. For suppressive therapy, regular follow‑up is recommended to re‑evaluate the need for continued treatment. If you experience confusion, hallucinations, or signs of kidney problems (decreased urine output, swelling), seek immediate medical attention. Always inform your doctor about all medications and any history of kidney disease before starting treatment.

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