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ACICLOVIR 800 MG TABLETS - patient leaflet, side effects, dosage

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Patient leaflet - ACICLOVIR 800 MG TABLETS

Aciclovir 800 mg tablets

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.
  • 1. What Aciclovir is and what it is used for

  • 2. What you need to know before you take Aciclovir

  • 3. How to take Aciclovir

  • 4. Possible side effects

  • 5. How to store Aciclovir

  • 6. Contents of the pack and other information

1. what aciclovir is and what it is used for

Aciclovir 800 mg tablets (called ‘Aciclovir’ in this leaflet) contains a medicine called aciclovir. This belongs to a group of medicines called antivirals. It works by killing or stopping the growth of viruses.

Aciclovir can be used to:

  • treat chickenpox and shingles

2. what you need to know before you take aciclovir

Do not use Aciclovir:

  • if you are allergic to aciclovir or valaciclovir or any of the other ingredients of this medicine (listed in Section 6).

Do not take Aciclovir if the above applies to you. If you are not sure, talk to your doctor or pharmacist before taking Aciclovir.

Warnings and precautions

Talk to your doctor or pharmacist before taking Aciclovir if:

  • you have kidney problems
  • you are over 65 years of age.

If you are not sure if the above apply to you, talk to your doctor or pharmacist before taking Aciclovir.

It is important that you drink plenty of water while taking Aciclovir.

Other medicines and Aciclovir

Tell your doctor or pharmacist if you are taking, have recently taken or might take any 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: probenecid, used to treat gout
  • cimetidine, used to treat stomach ulcers
  • mycophenolate mofetil, used to stop your body rejecting transplanted organs.

Pregnancy, breast-feeding and fertility

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.

Driving and using machines

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.

3. how to take aciclovir

Always take this medicine exactly as your doctor has told you. Check with your doctor or pharmacist if you are not sure.

Taking this medicine

  • Take this medicine by mouth.
  • Dissolve the tablet in a glass of water and stir before drinking.
  • If you prefer, the tablet can also be swallowed whole with a little water.
  • Start to take Aciclovir as soon as possible.

The dose that you should take will depend on what you have been given Aciclovir for. Your doctor will discuss this with you.

Treatment of chickenpox and shingles

  • The usual dose is one 800 mg tablet taken five times a day.
  • You should space each dose by 4 hours Suggested times are: 7am, 11am, 3pm, 7pm and 11pm.
  • You should take Aciclovir for seven days.
  • it is for a child
  • you are over 65 years of age
  • you have kidney problems. If you have kidney problems, it is important to drink plenty of water while you are being treated with Aciclovir.

Talk to your doctor before taking Aciclovir if any of the above apply.

If you take more Aciclovir than you should Aciclovir is not usually harmful, unless you take too much over several days. Talk to your doctor or pharmacist if you take too much Aciclovir. Take the medicine pack with you.

If you forget to take Aciclovir

  • If you forget to take Aciclovir, take it as soon as you remember. However, if it is nearly time for your next dose, skip the missed dose.
  • Do not take a double dose to make up for a forgotten dose.

4. possible side effects

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 and see a doctor straight away. The signs may include:

  • rash, itching or hives on your skin
  • swelling of your face, lips, tongue or other parts of your body
  • shortness of breath, wheezing or trouble breathing
  • collapse

Other side effects include:

  • Common (may affect up to 1 in 10 people) headache feeling dizzy
  • feeling or being sick
  • diarrhoea
  • stomach pains
  • rash
  • skin reaction after exposure to light (photosensitivity)
  • itching
  • feeling tired
  • unexplained fever (high temperature) and feeling faint, especially when standing up.
  • Uncommon (may affect up to 1 in 100 people) itchy, hive-like rash hair loss.
  • Rare (may affect up to 1 in 1,000 people) effects on some blood and urine tests increases in the enzymes that work in the liver.

Very rare (may affect up to 1 in 10,000 people)

  • reduced numbers of red blood cells (anaemia)
  • reduced numbers of white blood cells (leukopenia)
  • reduced numbers of blood platelets (cells that help blood to clot) (thrombocytopenia)
  • feeling weak
  • feeling agitated or confused
  • shaking or tremors
  • hallucinations (seeing or hearing things that aren’t there)
  • fits
  • feeling unusually sleepy or drowsy
  • unsteadiness when walking and lack of coordination
  • difficulty speaking
  • inability to think or judge clearly
  • unconsciousness (coma)
  • paralysis of part or all of your body
  • disturbances of behaviour, speech and eye movements
  • stiff neck and sensitivity to light
  • inflammation of the liver (hepatitis)
  • yellowing of your skin and whites of your eyes (jaundice)
  • kidney problems where you pass little or no urine
  • pain in your lower back, the kidney area of your back or just above your hip (renal pain).

Reporting of side effects

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: 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.

5. how to store aciclovir

  • Keep this medicine out of the sight and reach of children.
  • Do not store above 30°C.
  • Do not use this medicine after the expiry date which is stated on the carton after Exp. The expiry date refers to the last day of that month.
  • Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.

6. contents of the pack and other information

What Aciclovir contains

  • The active substance is aciclovir.

Each 800 mg tablet contains 800 mg aciclovir.

  • The other ingredients are microcrystalline cellulose, povidone K30, sodium starch glycolate Type A and magnesium stearate.

What Aciclovir looks like and contents of the pack

Aciclovir 800 mg tablets are supplied to you in cartons containing 35 tablets in aluminium foil strips. They are white, elongated, biconvex tablets scored on one side.

Marketing authorisation holder and manufacturer

Marketing Authorisation Holder

Dawa Ltd, 5 Sandridge Close, Harrow, Middlesex HA1 1XD


Pharmaceutical Works POLPHARMA SA

19 Pelplinska Street, 83–200 Starogard Gdanski, Poland.

This leaflet was last revised in July 2019.

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