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Aciclovir 400mg

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Aciclovir is an antiviral medication. It is primarily used to treat herpes infections of the skin and mucous membranes, especially both oral and genital herpes, contracted from practicing unsafe sex. It works by preventing viral infections from multiplying, reducing the severity of the infection and stopping it from spreading.
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What is Aciclovir?

Aciclovir, sometimes known as Acyclovir, is an antiviral medicine which acts on infected cells by stopping the virus from growing. Aciclovir 400mg is used to treat and prevent herpes simplex infections of the skin and mucous membranes, including both oral and genital herpes. Additionally, Aciclovir 400mg can also be used to treat chicken pox.

How does Aciclovir work?

Aciclovir works by preventing viruses from multiplying. This reduces the severity of the infection and stops it from spreading. In additional to clearing up an outbreak, Aciclovir can be prescribed to prevent herpes outbreaks from occurring.

How do you take Aciclovir?

Aciclovir needs to be taken as prescribed to you by your doctor or pharmacist. This will vary depending on whether you’re taking the medication for treatment or as a preventative measure. Aciclovir tablets should be swallowed with water, but can be taken with or without food.


The usual dose for treating genital herpes outbreaks is 400 mg 3 times daily, usually for 5 days. This treatment can last longer if new lesions appear during the treatment or if healing is incomplete after the standard dose.  


When taken as preventatively to suppress additional outbreaks, Aciclovir 400 mg is taken twice daily.

How effective is Aciclovir in treating herpes?

Aciclovir is an effective and affordable way of preventing and easing herpes symptoms. While Aciclovir is effective in treating and preventing outbreaks, there is no cure for genital herpes.

What are the common side effects of Aciclovir?

The most common side effects of Aciclovir are dizziness, headache, feeling or being sick, diarrhea, stomach pain, rashes, itching, sensitivity to sunlight, and fever. For more infrequent side effects, see the patient information leaflet.

Frequently Asked Questions

How long does it take for Aciclovir to work?


The earlier the medication is started once you’re experiencing an outbreak, the better the chance of easing symptoms. If Aciclovir is started within 5 days of the onset of symptoms, the length and severity of an outbreak will be greatly reduced. Typically, you will notice an improvement within two or three days. The outbreak will last approximately a week.


Where can I buy Aciclovir tablets?


You can buy Aciclovir tablets online here.


Can you consume alcohol while on Aciclovir?


Yes, it is safe to drink alcohol while on Aciclovir. However, it is important to adhere to general health guidelines when it comes to alcohol. This means one should not exceed 14 units of alcohol a week.


What is the difference between Aciclovir and Valaciclovir?


Both medications are antiviral tablets that can be used to treat and prevent genital herpes. The main difference between the two is that Valaciclovir is only taken twice daily, while Aciclovir is taken 3 times daily, or as directed by your doctor.


Can Aciclovir be used to treat both oral and genital herpes?


Yes, as an antiviral drug, Aciclovir can be used to treat both oral and genital herpes. Aciclovir can also be used to treat other viral infections, such as chicken pox.


What do I do if I missed a dose of Aciclovir?


Aciclovir is most effective when the amount of drug in your system stays at a constant level. It is therefore important that you take this medication at evenly spaced intervals. If you miss a dose, take it as soon as you remember. However, if it is nearly time for your next dose, skip the missed dose. Do not take two doses at once to compensate for a missed dose.

More Information
Dosage Instructions Please see medicine label for the dosage instructions.