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Aciclovir Tablets - Genital Herpes Treatment

Available in multiple pack sizes

Upon completion of a medical consultation with one of our health care professionals you can expect prices to start from £0
Prescription Included
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Treatment Included
All inclusive price starts from £0

The treatment is inclusive of consultation, private prescription & medicine delivery
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Checked for Accuracy by James O'Loan . CEO & Prescribing Pharmacist . on 20/09/2021

What are aciclovir tablets? 

Aciclovir is an antiviral medicine used to treat the herpes virus - it can be used to treat genital herpes, cold sores, and other herpes simplex infections, as well as chickenpox and shingles. Antiviral medicines act on infected cells by stopping the virus from growing. 

What is the recommended dosage? 

The recommended adult dosage for these 400mg aciclovir tablets is usually 2 per day, with an interval of 12 hours between. You should swallow these tablets whole with water, but if necessary you can dissolve the tablets in a glass of water, as long as it’s 50ml or more. You can take aciclovir tablets with or without food. 

The dosage will depend on the type of herpes virus that you’re using aciclovir tablets for, as well as your age. When you’re prescribed this medicine by your doctor or Chemist4U pharmacist, you will be given a recommended dosage dependent on your needs. You must always follow your doctor or pharmacist’s advice. 

You should start taking aciclovir at the first signs of infection - this way, you should start to feel better after just a few days. 

How does aciclovir treat herpes? 

These tablets contain 400mg of aciclovir, which works by preventing the herpes virus from multiplying, reducing the severity of the infection and stopping it from spreading. Aciclovir can also be prescribed to prevent herpes infections in people who have had them before or those with a weak immune system. 

What is herpes? 

There are several different types of herpes virus, including herpes zoster (shingles) and varicella zoster (chickenpox) - but the most common and recognisable type is the herpes simplex virus, also known as HSV. There are two types of herpes simplex virus: 


This causes oral herpes, leading to cold sores and blisters around the mouth or face. HSV-1 can be contracted by interactions such as kissing, sharing a lip balm, or eating from the same utensils as someone who has HSV-1. 


This is contracted through sexual contact with someone who has HSV-2, causing genital herpes. Unlike HSV-1, which can be contracted from a person without any symptoms, HSV-2 usually spreads through direct contact with a herpes sore. 

There’s currently no cure for herpes simplex - once you’ve become infected, the virus remains in your body and sores may come and go throughout your life. Fortunately, sores can go away by themselves or with simple treatments like aciclovir. 

Are aciclovir tablets suitable for pregnant or breastfeeding women? 

If you are pregnant, think you may be pregnant, trying to have a baby or are breastfeeding, you should speak to a Chemist4U pharmacist before taking aciclovir tablets to make sure they’re right for you and your baby. 

Are aciclovir tablets suitable for children? 

Aciclovir is suitable for children, but for children under the age of 2, a smaller dose may be needed. You should always follow your doctor or pharmacist’s advice when these tablets are prescribed to you or your child. 

When should this medicine not be used? 

You must not take aciclovir tablets if you are allergic to aciclovir, valaciclovir, or any of the other ingredients in this medicine. You should talk to your doctor or Chemist4U pharmacist before taking aciclovir if: 

  • You have kidney problems

  • You are over 65

  • You have nervous system abnormalities 

  • You are taking any other medicines, particularly cimetidine (used to treat peptic ulcers), probenecid (used to treat gout), mycophenolate mofetil (used to stop your body rejecting transplanted organs), or theophylline (used in asthma or other breathing problems) 

Are there any side effects? 

As with all medicines, aciclovir comes with the possibility of side effects. Fortunately, these won’t affect everyone. If you have any signs of an allergic reaction (rash, swelling of the face, shortness of breath) or jaundice (yellowing of your skin & whites of your eyes), stop taking aciclovir immediately and seek immediate medical attention. 

Common side effects that may affect up to 1 in 10 people include: 

  • Headache 

  • Feeling dizzy

  • Feeling or being sick

  • Diarrhoea

  • Stomach pain

  • Skin reaction after exposure to light (photosensitivity)

  • Itching

  • Feeling tired

  • Unexplained fever

  • Feeling faint when standing up 

An uncommon side effect that may affect up to 1 in 100 people is hair loss. Rare and very rare side effects can include: 

  • Effects on certain blood or urine tests

  • Increases in the enzymes that work in the liver

  • Reduced numbers of red blood cells (anaemia)

  • Reduced numbers of white blood cells (leukopenia) 

  • Reduced numbers of blood platelets (thrombocytopenia) 

  • Feeling weak

  • Feeling agitated or confused

  • Shaking or tremors 

  • Hallucinations 

  • Fits

  • Feeling unusually sleepy or drowsy

  • Unsteadiness when walking 

  • Lack of coordination

  • Difficulty speaking

  • Inability to think or judge clearly

  • Unconsciousness

  • Paralysis of part or all of your body 

  • Disturbances of behaviour, speech and eye movements 

  • Stiff neck

  • Sensitivity to light

  • Inflammation of the liver (hepatitis) 

  • Kidney problems where you pass little or no urine

  • Pain in your lower back or just above your hip

If you experience any side effects, including any not included in the patient information leaflet, you can report them using the MHRA Yellow Card Scheme

Do I need a prescription for aciclovir?

You do need a prescription for aciclovir in the UK. Our healthcare professionals can provide prescriptions if they think this treatment would be right for you and your condition. When you click the button which reads “Start Consultation” at the top of this page, you’ll see a short questionnaire set up by our healthcare team which is designed to help them understand your medical needs. Just like an in-person consultation with your GP, our doctors will assess your answers to their questions and write a prescription for the treatment they think will be best for you. You’ll then be able to pay for your medication and we’ll send it out to you quickly and in discreet packaging.

Storage information

Keep this medicine out of the sight and reach of children. Store below 25°C in a cool, dry place. Do not use this medicine after the expiry date, which is stated on the packaging. The expiry date refers to the last day of that month.

Important information

This product is a medicine; make sure to speak to your doctor or Chemist4U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.

Helpful Advice on Medication Restrictions & Addiction

For further information on our medication restrictions policy, please click here.

If you are concerned about addiction to 'over the counter' medication, we urge you to visit the below links for professional help and advice:

NHS Help & Advice on Drug Addiction

Talk To Frank - Drug Addiction Help & Support

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Hi I’m trying to order a prescription of aciclovir tablets, I don’t pay for prescriptions due to income support but I can’t find a way on the website to order without paying. How can I order this prescription through my doctors without paying please?

You can ring up your G.P. and ask if they will issue a prescription for you. They may want to see you, or they may speak to you over the phone. Private prescriptions need to be paid for, whereas if your G.P. issues an N.H.S. prescription, you will not have to pay as you are on income support. Hope this helps.

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Shipping Costs

Free UK Delivery on all orders over £30* - Delivery within 3-5 working days.

Standard UK Delivery - £2.95* - Delivery within 3-5 working days.

Express UK Delivery - £4.95** - Delivery within 1-2 working days.

Temperature Controlled Delivery - £8.85 - Delivery within 1-3 working days.

Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.

*Excluding refrigerated products and treatments which are subject to different postage charges.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist4U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.

Returns Information

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