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Letermovir oral

Updated 2 Feb 2023 | Cytomegalovirus (CMV)


Oral formulation of letermovir.

Drugs List

  • letermovir 240mg tablets
  • PREVYMIS 240mg tablets
  • Therapeutic Indications


    Prophylaxis of CMV infection in haematopoietic stem cell transplant pts

    Prophylaxis of cytomegalovirus (CMV) reactivation and disease in adult CMV-seropositive recipients (R+) of an allogeneic haematopoietic stem cell transplant (HSCT).



    480mg once daily.

    Letermovir can be started any time between the day of transplant (after the HSCT), and up to 28 days after transplant. Letermovir may be started before or after engraftment. Treatment should continue for 100 days post-transplant. Use beyond 100 days post-transplant may be of benefit in patients at high risk for late CMV reactivation, but has not been studied in clinical trials.

    Additional Dosage Information

    Letermovir tablets and concentrate for solution for infusion may be interchanged with no dose adjustment required.

    Letermovir co-administered with ciclosporin
    240mg once daily.
    Ciclosporin initiated after starting letermovir
    Next dose of letermovir should be decreased to 240mg once daily.
    Ciclosporin discontinued after starting letermovir
    Next dose of letermovir should be increased to 480mg once daily.
    Temporary interruption to ciclosporin treatment due to high ciclosporin levels
    No dose adjustment needed.


    Children under 18 years
    Moderate hepatic impairment with moderate or severe renal impairment
    Severe hepatic impairment - Child-Pugh score greater than or equal to 10

    Precautions and Warnings

    Females of childbearing potential
    End stage renal disease
    Glucose-galactose malabsorption syndrome
    Lactose intolerance

    Advise ability to drive/operate machinery may be affected by side effects
    Treatment to be initiated by specialist
    Contains lactose
    Advise patient on concurrent use of proton pump inhibitors
    Monitor patients receiving concurrent anticoagulants
    Advise patient not to take St John's wort concurrently
    Female: Ensure adequate contraception during treatment

    Pregnancy and Lactation


    Letermovir is contraindicated during pregnancy.

    There is limited data on the use of letermovir during pregnancy. The manufacturer does not recommend using letermovir in pregnancy and in women of childbearing potential not using contraception.

    Animal studies have shown reproductive toxicity.


    Letermovir is contraindicated during breastfeeding.

    The manufacturer advises that the patient either discontinues letermovir treatment or discontinues breastfeeding.

    The presence of letermovir in human breast milk is unknown but due to its high plasma protein binding the amount present in breast milk would likely to be low.

    Side Effects

    Abdominal pain
    Alanine aminotransferase increased
    Aspartate aminotransferase increased
    Decreased appetite
    Hypersensitivity reactions
    Muscle spasm
    Peripheral oedema
    Serum creatinine increased


    It is strongly recommended that the UK National Poisons Information Service be consulted on cases of suspected or actual overdose where there is doubt over the degree of risk or about appropriate management.

    The following number will direct the caller to the relevant local centre (0844) 892 0111

    Information may be obtained if you have access to ToxBase the primary clinical toxicology database of the National Poisons Information Service. This is available via password on the internet ( ) or if this is unavailable at the backup site ( ).

    Further Information

    Last Full Review Date: February 2022

    Reference Sources

    Summary of Product Characteristics: Prevymis 240mg film-coated tablets. Merck Sharp & Dohme (UK) Limited. Revised January 2021.

    US National Library of Medicine. Toxicology Data Network. Drugs and Lactation Database (LactMed).
    Available at:
    Letermovir. Last revised: 07 February 2019
    Last accessed: 20 January 2022

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