
Valacyclovir


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Upload your prescription.
Complete your purchase by processing the payment.
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Valacyclovir is a prescription-only antiviral medication used to treat certain herpes virus infections in adults and children. Valacyclovir works by converting into acyclovir after ingestion, which inhibits viral DNA replication. This helps reduce the severity and duration of outbreaks but does not cure herpes infections. This medication must be taken under the supervision of a licensed healthcare provider. Patients who are seeking cost-saving options may explore licensed Canadian pharmacies while maintaining prescription and safety requirements.
| Category | Details |
|---|---|
| Brand Name | Valtrex |
| Generic Name | Valacyclovir hydrochloride |
| Drug Class | Antiviral (nucleoside analogue) |
| FDA‑Approved Uses | - Herpes zoster (shingles) - Genital herpes (initial and recurrent episodes, suppression, reduction of transmission) - Cold sores (herpes labialis) - Chickenpox in children |
| Dosage Forms / Strengths | Oral tablets: • 500 mg • 1 gram (1,000 mg) |
| Common Side Effects | Headache, nausea, abdominal pain, fatigue |
| Contraindications | Known hypersensitivity to Valacyclovir, acyclovir, or any component of the formulation |
| Special Precautions | - Dose adjustment required in renal impairment - Maintain adequate hydration - Use caution in elderly patients due to CNS effects |
| Prescription Required | Prescription only |
| Storage | Store at 20–25°C (68–77°F), protect from moisture, keep out of reach of children. |
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FDA-approved uses of Valacyclovir include treatment and suppression of the following viral infections:
The following dos and don’ts highlight important safety guidance for using Valacyclovir (Valtrex):
This is not a complete list of Valacyclovir side effects. If you notice other adverse reactions during your treatment, report them immediately to your prescriber.
| Category | Examples | Notes |
|---|---|---|
| Common Side Effects | Headache, nausea, abdominal pain, fatigue | Usually mild and self‑limited; most patients tolerate therapy well. |
| Less Common Side Effects | Vomiting, dizziness, rash, diarrhea | May require dose adjustment or medical review if persistent. |
| Serious Side Effects | Kidney problems (renal failure), confusion, agitation, hallucinations | More likely in elderly or immunocompromised patients; requires immediate medical attention. |
| Rare Side Effects | Thrombocytopenic purpura / hemolytic uremic syndrome (TTP/HUS) reported mainly in immunocompromised patients | Very rare but potentially life‑threatening; discontinue the drug if suspected. |
| Allergic Reactions | Rash, itching, swelling, difficulty breathing | Contraindicated in patients with known hypersensitivity to acyclovir or valacyclovir. |
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Valacyclovir is an antiviral medication. After oral administration, it is rapidly converted in the body to acyclovir, its active form.
Acyclovir works by inhibiting viral DNA synthesis. It blocks the action of viral DNA polymerase, an enzyme that herpes viruses need to replicate. By interfering with this process, Valacyclovir helps:
Valacyclovir does not cure herpes infections, but it helps manage and suppress viral activity when taken as prescribed.
The following precautions should be considered when using Valacyclovir tablets:
If you are prescribed Valacyclovir, follow these administration steps to ensure safe and effective use:
Consult your provider before starting your treatment. They will individualize the dose based on symptom control and tolerance. Here are the average Valacyclovir dosage guidelines for adults and pediatric patients:
| Indication | Adult Dose | Duration | Notes |
|---|---|---|---|
| Herpes Zoster (Shingles) | 1 gram (1,000 mg) orally every 8 hours | 7 days | Start within 48 hours of rash onset. |
| Genital Herpes – Initial Episode | 1 gram (1,000 mg) orally every 12 hours | 10 days | Begin with the first episode. |
| Genital Herpes – Recurrent Episode | 500 mg orally every 12 hours | 3 days | Start at the first sign of recurrence. |
| Genital Herpes – Suppressive Therapy | 1 gram (1,000 mg) orally once daily | Continuous | Alternative: 500 mg once daily for ≤9 recurrences/year. |
| Reduction of Transmission (Genital Herpes) | 500 mg orally once daily | Continuous | For discordant couples (one partner infected). |
| Herpes Labialis (Cold Sores) | 2 grams (2,000 mg) orally every 12 hours | 1 day (2 doses total) | Start at the first symptom (tingling, burning). |
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| Indication | Pediatric Dose | Duration | Notes |
|---|---|---|---|
| Chickenpox (2–18 years) | 20 mg/kg orally every 8 hours (max 1 gram per dose) | 5 days | Start within 24 hours of rash onset. |
| Cold Sores (≥12 years) | 2 grams (2,000 mg) orally every 12 hours | 1 day (2 doses total) | Same regimen as adults. |
| Other Uses | Not established in children <12 years for genital herpes or shingles | — | Safety and efficacy have not been determined. |
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Taking more than the prescribed dose of Valacyclovir may raise the risk of serious side effects. Valacyclovir overdose effects are most often linked to kidney and nervous system toxicity, especially in people with kidney disease or older adults.
Possible effects of Valacyclovir overdose include:
In severe cases, Valacyclovir overdose may lead to coma or life-threatening complications, particularly if medical care is delayed.
What to do in case of overdose:
Valacyclovir may interact with certain medications that affect kidney function or drug clearance in the body. Always inform your provider about all prescription drugs, over-the-counter medicines, and supplements you are taking before starting Valacyclovir.
If Valacyclovir is unsuitable or unavailable, the following alternatives may be considered after consulting a medical provider:
At Polar Bear Meds, we help make Valacyclovir more affordable without compromising on quality. By partnering with licensed Canadian pharmacies, we offer Valacyclovir at prices often up to 80% lower than those of typical U.S. pharmacies.
New customers may save even more by using the Valacyclovir coupon code “WELCOMEPB10” for an extra 10% off. No insurance is required, and there are no hidden fees. All orders are shipped fast and discreetly, typically within 3–5 business days via Xpress Post, making it simple and reliable to start your treatment.
This information is for educational purposes only and should not substitute for medical advice, diagnosis, or treatment. Valacyclovir is a prescription medicine and should be taken only as directed by your prescriber. This is particularly important if you have underlying health conditions, are pregnant, breastfeeding, or using other medicines.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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