Patient Leaflet Updated 23-Apr-2026 | Wockhardt UK Ltd
Aciclovir 200mg/400mg/800 Tablets
Aciclovir 200mg, 400mg and 800mg Tablets
1. What Aciclovir Tablets are and what they are used for
2. What you need to know before you take Aciclovir Tablets
3. How to take Aciclovir Tablets
4. Possible side effects
5. How to store Aciclovir Tablets
6. Contents of the pack and other information
The name of your medicine is Aciclovir Tablets. This belongs to a group of medicines called antivirals. It works by killing or stopping the growth of viruses.
Aciclovir Tablets can be used to:
Do not take Aciclovir Tablets if the above applies to you. If you are not sure, talk to your doctor or pharmacist before taking Aciclovir Tablets.
Talk to your doctor of pharmacist before taking Aciclovir Tablets if:
If you are not sure if the above apply to you, talk to your doctor or pharmacist before taking Aciclovir Tablets. It is important that you drink plenty of water while taking Aciclovir Tablets.
Aciclovir can cause severe skin reactions. You must look out for certain symptoms while taking Aciclovir Tablets, to reduce the risk of any problems. If you experience any signs or symptoms of severe skin reactions, stop taking Aciclovir Tablets and contact your doctor immediately (see possible side effects’).
Tell your doctor or pharmacist if you are taking or have recently taken any other medicines. This includes medicines obtained without a prescription, including herbal medicines.
In particular tell your doctor or pharmacist if you are taking any of the following medicines:
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.
Some side effects such as feeling drowsy or sleepy may impair your ability to concentrate and react. Make sure you are not affected before you drive or operate machinery.
If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.
This medicine contains less than 1mmol sodium (23 mg) per dosage unit, that is to say essentially ‘sodium-free’.
Always take this medicine as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
The dose that you should take will depend on what you have been given Aciclovir Tablets for. Your doctor will discuss this with you.
Treatment of chickenpox and shingles
Treatment of cold sores and genital herpes
Stopping these problems returning after you have had them
Stopping these problems in people whose immune systems work less well and whose bodies are less able to fight infections
Talk to your doctor before taking Aciclovir Tablets if any of the above apply.
Aciclovir Tablets are not usually harmful, unless you take too much over several days. Talk to your doctor or pharmacist if you take too much Aciclovir Tablets. Take the medicine pack with you.
Do not take a double dose (two doses at the same time) to make up for a forgotten dose. Take your next dose as soon as you remember, then go on as before. However, if it is nearly time for the next dose, skip the missed dose.
If you have any further questions on the use of this medicine ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them. The following side effects may happen with this medicine:
Allergic reactions (may affect up to 1 in 1,000 people)
If you have an allergic reaction, stop taking Aciclovir Tablets and see a doctor straight away. The signs may include:
Severe skin reactions: These are very rare (these may affect up to 1 in 10,000 people) taking Aciclovir Tablets. Signs include:
Contact a doctor immediately if you get these symptoms.
Other side effects include:
Common (may affect up to 1 in 10 people)
Uncommon (may affect up to 1 in 100 people)
Rare (may affect up to 1 in 1,000 people)
Very rare (may affect up to 1 in 10,000 people)
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
The tablets come in three strengths, 200mg, 400mg and 800mg.
Aciclovir 200mg Tablets are white, circular tablets marked ACV 200 on one face and CP on the reverse.
Aciclovir 400mg Tablets are white, oval tablets marked with ACV 400 and a breakline on one face and CP on the reverse.
Aciclovir 800mg Tablets are white, oval tablets marked with ACV 800 and a breakline on one face and CP on the reverse.
Aciclovir 200mg Tablets are available in blister packs of 25 and 100 tablets.
Aciclovir 400mg Tablets are available in blister packs of 25, 30, 56, 60, 70 and 100 tablets.
Aciclovir 800mg Tablets are available in blister packs of 35 tablets.
Not all pack sizes may be marketed.
Other formats:
To listen to or request a copy of this leaflet in Braille, large print or audio please call, free of charge:
0800 198 5000 (UK only)
Please be ready to give the following information:
Product name Reference number
Aciclovir 200mg Tablets 29831/0002
Aciclovir 400mg Tablets 29831/0001
Aciclovir 800mg Tablets 29831/0003
This is a service provided by the Royal National Institute of Blind People.
This leaflet was last revised 02/2026.
106862/6
Ash Road North, Wrexham Industrial Estate, Wrexham, LL13 9UF
+44 (0)1978 661 702
+44 (0)1978 661 261
www.wockhardt.co.uk