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Acyclovir

Acyclovir — Herpes Treatment

Acyclovir is the world's most widely used antiviral medication for herpes. It treats genital herpes (HSV-2), cold sores (HSV-1), and shingles (Herpes Zoster). Acyclovir reduces symptom severity, speeds healing, and prevents recurrent outbreaks. Intimo Life offers Acyclovir ready for delivery.

💊 Acyclovir for herpes — treats outbreaks and prevents recurrence with daily suppressive therapy.

👨‍⚕️ Consult a pharmacist online instantly — no travel, no queues, completely private and convenient.

🚚 Fast, confidential delivery — plain packaging with no product names on the outside, delivered safely to your door.

Acyclovir is a Nucleoside Analogue antiviral — the first of its kind approved for treating Herpes Simplex Virus (HSV). Its discoverer was awarded the Nobel Prize in Physiology or Medicine in 1988.

📊 Key facts:

  • Reduces outbreak duration by 2-3 days when started early
  • Significantly reduces pain, burning, and blistering
  • Daily low-dose use prevents recurrence in 70-80% of cases — ideal for frequent outbreaks

💊 At Intimo Life:

  • Vilerm — Oral Acyclovir for herpes treatment and recurrence prevention

⚠️ Acyclovir works best when started immediately at the first sign of symptoms. The sooner, the better.

Supatcheree A., Pharmacist

Medically reviewed by

Supatcheree A., Pharmacist | แหล่งข้อมูล: NHS, Mayo Clinic, WHO, PubMed

Last reviewed: 2026-02-17

Available Treatments

About Acyclovir

What Is Acyclovir? How Does It Work?

Acyclovir is a Nucleoside Analogue antiviral that targets cells infected with the Herpes virus with remarkable specificity.

🔬 Mechanism of action — Acyclovir is converted to its active form by the enzyme Thymidine Kinase, which exists only in Herpes-infected cells. The active form integrates into the viral DNA, blocking replication and halting the virus from multiplying.

Key advantage: Because Acyclovir relies on a viral enzyme, normal cells are virtually unaffected. This gives Acyclovir an exceptionally high safety profile with minimal side effects.

Important to understand: Acyclovir does not cure herpes. The Herpes virus permanently resides in nerve ganglia. Acyclovir controls viral replication and reduces symptoms during outbreaks.

What Is Acyclovir Used For?

💊 Genital herpes (HSV-2) — The primary indication. Treats first episodes, recurrent outbreaks, and provides daily suppressive therapy.

💊 Cold sores (HSV-1) — Blisters on or around the lips. Acyclovir speeds healing and reduces severity.

💊 Shingles (Herpes Zoster) — Caused by the Varicella-Zoster virus (same virus as chickenpox). Acyclovir reduces pain and rash duration.

💊 Chickenpox (Varicella) — Used in severe cases or for at-risk adults.

How to Take Acyclovir

Dosage varies by condition and treatment goal.

Genital herpes — first episode:

  • Acyclovir 200 mg five times daily (every 4 hours while awake) for 7-10 days
  • Or 400 mg three times daily for 7-10 days

Genital herpes — recurrent outbreak:

  • Acyclovir 200 mg five times daily for 5 days
  • Or 400 mg three times daily for 5 days
  • Or 800 mg twice daily for 5 days

Suppressive therapy (recurrence prevention):

  • Acyclovir 400 mg twice daily, continuously

The earlier, the better — Start Acyclovir at the very first sign of symptoms (tingling, burning, itching before blisters appear) for best results.

💧 Drink plenty of water — Acyclovir is excreted through the kidneys. Staying well hydrated reduces kidney-related risks.

Side Effects

Acyclovir has an excellent safety profile — one of the safest antivirals available.

Common (but mild) — Nausea / diarrhoea / headache / dizziness

Very rare — Kidney effects (with high doses or insufficient hydration). Prevented by drinking plenty of water.

Important: Acyclovir is safe for long-term use. Many patients take daily suppressive Acyclovir for years without issues.

Contraindications and Precautions

Acyclovir has very few contraindications.

Safe for — Most adults / pregnant women (Category B — no harm found in studies) / breastfeeding women

⚠️ Dose adjustment needed — Chronic kidney disease (kidneys excrete Acyclovir — impaired kidneys cause drug accumulation)

💧 Essential — Drink plenty of water throughout Acyclovir treatment to protect kidney function.

Can Herpes Be Cured?

Directly: no. Once infected, the Herpes Simplex Virus permanently resides in nerve ganglia. No medication can eliminate it completely.

But it can be very well controlled. Acyclovir helps in three ways:

  1. Treats outbreaks — Reduces severity and speeds healing by 2-3 days
  2. Prevents recurrence — Daily 400 mg twice daily reduces outbreaks by 70-80%
  3. Reduces transmission — Daily Acyclovir reduces the chance of transmitting herpes to a partner by approximately 50%

Many herpes patients on consistent suppressive Acyclovir live completely normal lives with virtually no outbreaks.

When Should You Start Suppressive Therapy?

Not everyone with herpes needs daily Acyclovir. It's recommended for:

✅ Outbreaks more than 6 times per year
✅ Outbreaks that are severe or significantly affect quality of life
✅ Wanting to reduce transmission risk to a partner
✅ Herpes causing significant psychological distress

If outbreaks are infrequent (fewer than 6 per year), episodic treatment (Acyclovir only during outbreaks) may be sufficient. Consult a pharmacist to determine the best approach.

Acyclovir vs Valacyclovir — What's the Difference?

Valacyclovir is a prodrug of Acyclovir (the body converts Valacyclovir into Acyclovir).

Acyclovir — 15-30% bioavailability / requires more frequent dosing (3-5 times daily) / more affordable / longest safety track record

Valacyclovir — 55% bioavailability / fewer daily doses (1-3 times) / more convenient / higher cost

Bottom line: Same active drug in the body, same effectiveness. Valacyclovir is more convenient; Acyclovir is more affordable. Choose based on preference and budget.

Genital Herpes — Nothing to Be Ashamed Of

Genital herpes is extremely common. According to the WHO, approximately 491 million people aged 15-49 have HSV-2, and approximately 3.7 billion people have HSV-1 worldwide.

Many people carry the virus without knowing it, as symptoms may be absent or very mild. Having herpes does not reflect any particular behaviour. It's a manageable condition with Acyclovir and does not affect overall health.

Where Can I Buy Acyclovir?

Acyclovir requires a pharmacist consultation to determine the right dosage and treatment duration for your condition. You can order Acyclovir online at Intimo Life in a few simple steps:

  1. Consult a pharmacist online to assess your condition and choose the appropriate treatment approach (outbreak treatment or suppressive therapy)
  2. Once the pharmacist confirms the medication is suitable, place your order for Vilerm
  3. Receive your medication at home — confidential delivery in plain packaging with no product names

No need to visit a pharmacy, no queues. Consult a pharmacist from the comfort of your home — convenient, fast, and private.

⚠️ Disclaimer

The information on this page is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment from a qualified doctor or pharmacist. If you have any questions about your symptoms or medication, always consult a doctor or pharmacist first.

Frequently Asked Questions

No. The Herpes virus permanently resides in the body. However, it's very well controlled with Acyclovir — both for treating outbreaks (heals 2-3 days faster) and preventing recurrence (reduces outbreaks by 70-80%).

As soon as possible. Start at the very first signs (tingling, burning, itching before blisters appear) for best results. After blisters appear it still helps, but effectiveness decreases.

Yes. Taking 400 mg twice daily continuously (Suppressive Therapy) reduces outbreaks by 70-80%. Recommended for those with more than 6 outbreaks per year. Safe for long-term use.

Very few. It's one of the safest antivirals available. The most common side effects are mild nausea and headache. The key is to drink plenty of water throughout treatment.

Yes. Acyclovir is Category B — no harm to the baby has been found in studies. Doctors often prescribe Acyclovir near delivery for women with herpes to prevent transmission to the newborn.

Through direct skin-to-skin contact, especially during active outbreaks with blisters. However, transmission can occur even without visible symptoms (Asymptomatic Shedding). Daily suppressive Acyclovir + condom use significantly reduces transmission risk.

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