An oral antiviral for CMV
Valganciclovir
An oral antiviral tablet or liquid that turns into ganciclovir in the body, used to treat and prevent CMV infection.
What is Valganciclovir?
Valganciclovir is a specialist antiviral taken as a tablet or liquid, which the body converts into ganciclovir. It is used to treat and to prevent cytomegalovirus (CMV) infection in people whose immune system is weakened, such as transplant recipients or those with advanced HIV. Being an oral medicine, it offers a convenient alternative to the ganciclovir drip. It shares the same main risk of lowering the blood counts, so blood tests are needed, and it can harm an unborn baby, so reliable contraception is advised. The brand name is Valcyte.
Education and reference only. This is a plain-language guide to Valganciclovir — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Valganciclovir is an antiviral taken by mouth as a tablet or liquid. After it is absorbed, the body converts it into ganciclovir, the active antiviral, so it works in the same way but can be taken at home rather than as a drip. It is used to treat cytomegalovirus (CMV) infection and to help prevent CMV in people at high risk, such as those who have had an organ transplant. It is a specialist, hospital-initiated medicine, with the brand name Valcyte.
How it works
Once swallowed, valganciclovir is changed in the body into ganciclovir, which is taken up by virus-infected cells and blocks the enzyme the virus needs to copy its genetic material. This stops the virus multiplying and gives the immune system time to gain control. Because the active form affects dividing cells, it can also reduce the production of blood cells in the bone marrow, which is why blood-count monitoring is needed just as with the ganciclovir drip.
Company & origin
Originated / developed by: Generic (specialist).
A specialist oral antiviral used in the UK to treat and prevent cytomegalovirus (CMV) infection in people with weakened immunity.
Practical use
How to take Valganciclovir
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take the tablets or liquid with food, exactly as prescribed, to help your body absorb it reliably.
- Swallow the tablets whole and do not break or crush them; if handling broken tablets, follow the safe-handling advice given.
- Attend all your blood tests, as the dose depends on your blood counts and kidney function.
- Use reliable contraception during treatment and for the period afterwards that your team advises, as it can harm an unborn baby.
- Report any fever, sore throat, unusual bruising or bleeding straight away, as these can signal low blood counts.
Weighing it up
Advantages & disadvantages of Valganciclovir
Advantages
- Works like ganciclovir but is taken by mouth, so it can be used at home rather than as a drip.
- Used both to treat CMV and to help prevent it in people at high risk, such as transplant recipients.
- Given and monitored by a specialist team, so problems can be picked up early.
Disadvantages
- Can suppress the bone marrow and lower blood counts, raising the risk of infection and bleeding.
- Can affect the kidneys and needs regular blood tests and monitoring.
- Can harm an unborn baby and may affect fertility, so contraception is needed.
Practical use
Good to know
Valganciclovir carries the same key caution as ganciclovir: it can suppress the bone marrow and lower the blood counts, raising the risk of infection, bleeding or bruising, and tiredness, so regular blood tests are essential and the dose is adjusted accordingly. Report any fever, sore throat, unusual bruising or bleeding promptly. It can affect the kidneys, so kidney function is monitored and the dose adjusted, and good hydration helps. The tablets should be handled carefully and not broken or crushed, as the contents can be harmful. Because it can harm an unborn baby and may affect fertility, reliable contraception is advised during treatment and for a period afterwards, for both women and men as directed.
Who should not take it / use with caution
- It is avoided in pregnancy unless essential, because it can harm an unborn baby.
- Used with great caution, and with extra monitoring, in people who already have very low blood counts.
- People with significant kidney problems need dose adjustment and close supervision.
Monitoring
- Regular blood counts to watch for suppression of white cells, platelets and red cells.
- Kidney function tests, as the dose may need adjusting.
- Checking the response of the infection, or that CMV is being kept at bay when used for prevention.
Side effects
- Low blood counts are common, causing tiredness, a higher risk of infection, and easier bruising or bleeding.
- Nausea, diarrhoea, headache and changes in kidney blood tests.
- Less commonly, rash, fever or mood and sleep changes.
Key interactions
- Combining it with other medicines that lower blood counts or affect the bone marrow can increase the risk.
- Taking it with medicines that can harm the kidneys may add to that effect.
- It can interact with certain other antivirals and some HIV medicines, so your team checks your full medicine list.
Available as: Tablets and an oral liquid taken by mouth.
Answers
Valganciclovir: frequently asked questions
How is valganciclovir different from ganciclovir?
Valganciclovir is taken by mouth and the body turns it into ganciclovir, so it works in the same way but can be used at home rather than as a drip.
What is it used for?
It is used to treat cytomegalovirus (CMV) infection and to help prevent CMV in people at high risk, such as those who have had an organ transplant.
Why do I need regular blood tests?
Like ganciclovir, it can lower the blood counts, so blood tests let your team adjust the dose and catch problems early.
Can I take it in pregnancy?
It can harm an unborn baby, so it is avoided in pregnancy unless essential, and reliable contraception is advised during treatment and for a period afterwards.
Should I take it with food?
Yes, it is usually taken with food, which helps your body absorb it reliably; take it exactly as prescribed.
The wider class
About Antiviral (CMV, oral)
Valganciclovir belongs to the antiviral (cmv, oral) class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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