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Acyclovir 800mg
Medically Reviewed by – Alfie Thornton, PharmD
Last Updated on 8 July 2026

Acyclovir 800mg

$1.48 $1.80
Acyclovir is an antiviral drug prescribed to treat infections such as chickenpox, genital herpes, shingles and cold sores, which are caused by herpes viruses. It decreases the growth and spread of herpes virus in the body and helps faster healing of sores. Acyclovir eye ointment is used to treat viral eye infections caused by herpes simplex viruses. Acyclovir is available as tablet, topical cream and eye ointment forms. This medicine may also be used to treat other conditions as determined by your doctor.
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Acyclovir 800mg CouponCoupon DescriptionCoupon Expiry Date
SUNNY28Summer Spectacular Sale2026-07-31
Categories: Anti ViralsTag: Pills

What is Acyclovir 800mg used for?

Acyclovir 800mg is an antiviral drug prescribed to treat infections such as chickenpox, genital herpes, shingles and cold sores, which are caused by herpes viruses. It decreases the growth and spread of herpes virus in the body and helps faster healing of sores. Acyclovir eye ointment is used to treat viral eye infections caused by herpes simplex viruses. Acyclovir is available as tablet, topical cream and eye ointment forms. This medicine may also be used to treat other conditions as determined by your doctor.

What are the side effects of Acyclovir 800mg?

Possible side effects of Acyclovir 800mg:

While most people tolerate Acyclovir well, some may experience mild to moderate reactions. Common side effects include:

  • Headache or dizziness

  • Nausea, vomiting, or stomach pain

  • Tiredness or weakness

  • Skin rash or itching

  • Increased sensitivity to sunlight

  • Diarrhoea or mild dehydration

  • Temporary changes in kidney function (rare)

If any of these symptoms persist or worsen, it’s best to speak with your doctor or pharmacist for guidance.

What is the recommended dosage of Acyclovir?

The recommended dosage of Acyclovir depends on the condition being treated and your doctor’s advice. Always follow your prescription carefully. Typical adult doses include:

  • Cold sores: 200mg five times a day for five days

  • Genital herpes: 400mg three times a day for 5–10 days

  • Shingles (herpes zoster): 800mg five times a day for seven days

  • Chickenpox: 800mg four times a day for five days

Always take Acyclovir with water and complete the full course prescribed.

What if you miss a dose of Acyclovir?

If your physician has instructed or directed you to use Acyclovir medication in a regular schedule and you have missed a dose of this medicine, use it as soon as you remember. However, if it is almost time for your next dose, then skip the missed dose and go back to your regular dosing schedule. Do not double the doses unless otherwise directed.

What if you overdose on Acyclovir?

Any medication taken in excess can have serious consequences. If you suspect an overdose of Acyclovir, seek medical attention immediately.

What other drugs could interact with Acyclovir 800mg?

It’s worth noting that medicines other than those listed here may also interact with Acyclovir. Drug interactions can occur when it’s taken with other medicines or certain foods. Before starting treatment, let your healthcare professional know about any other medicines you’re taking, including non-prescription or over-the-counter products, as well as vitamins, minerals, or herbal supplements. This helps your doctor warn you about any possible interactions. Acyclovir may interact with nonsteroidal anti-inflammatory drugs (NSAIDs). Be sure to tell your doctor if you smoke, drink alcohol, consume caffeine, or use recreational drugs, as these may affect how your medication works. Always inform your doctor about any existing medical conditions or family health history, and never start or stop any medicine without their guidance.

Where can I buy Acyclovir 800mg over the counter in UK?

You can’t buy Acyclovir 800mg tablets over the counter in the UK, as they are a prescription-only medicine. However, you can order them online through licensed UK pharmacies after an online consultation. A registered healthcare professional will review your condition before approving your order, ensuring safe and legal access to the medication delivered to your doorstep.

Can I buy Acyclovir 800mg without a prescription in UK?

In the UK, you cannot buy Acyclovir 800mg without a prescription, as it is a prescription-only medicine. You’ll need approval from a qualified healthcare professional before purchasing. Many registered online pharmacies offer quick consultations, allowing you to safely and legally obtain Acyclovir once prescribed and have it delivered discreetly to your home across the UK.

How is Acyclovir 800mg used for treating shingles in the UK?

Acyclovir 800mg is commonly prescribed for shingles in the UK. It helps reduce pain, speed up healing, and lower the risk of complications. Usually, it’s taken five times a day for seven to ten days. Start treatment as soon as symptoms appear for the best results and always follow your doctor’s instructions carefully.

Can I take Acyclovir 800mg five times a day?

Yes, Acyclovir 800mg can be taken five times daily, depending on your doctor’s advice. This dosage is often prescribed for treating shingles or severe herpes infections. Take each dose evenly spaced throughout the day and continue for the full course to ensure effective treatment and prevent recurrence.

What are the questions to ask your doctor before taking Acyclovir 800mg tablet?

Is it possible for me to use Acyclovir with other drugs? Should certain beverages, foods and other products be avoided when I use Acyclovir? What are the possible drug interactions of Acyclovir? How will Acyclovir work in my body? How should Acyclovir be used? How to reduce the risk of Acyclovir drug interactions and side effects?  

Note

The health and medical information provided here is intended to supplement and not substitute for the expertise and judgement of your physician, pharmacists or other health care professional. It should not be understood to indicate that the use of Acyclovir is safe, appropriate or effective for you. Always consult your health care professional before using this, or any other, drug.

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