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Letermovir Dosage

Medically reviewed by Last updated on Mar 29, 2023.

Applies to the following strengths: 240 mg; 480 mg; 240 mg/12 mL; 480 mg/24 mL

Usual Adult Dose for CMV Prophylaxis

480 mg orally or IV once a day
Duration of therapy: Through Day 100 posttransplantation


  • This drug should be started between Day 0 and Day 28 posttransplantation (before or after engraftment).

Use: For the prophylaxis of cytomegalovirus (CMV) infection and disease in CMV-seropositive recipients [R+] of an allogeneic hematopoietic stem cell transplant (HSCT)

Renal Dose Adjustments

CrCl greater than 10 mL/min: No adjustment recommended.
CrCl up to 10 mL/min: Insufficient data to make dosing recommendations


  • Patients with CrCl less than 50 mL/min using the IV formulation: Accumulation of the IV vehicle (hydroxypropyl betadex) may occur; serum creatinine levels should be monitored closely in such patients.

Liver Dose Adjustments

Mild or moderate liver dysfunction (Child-Pugh A or B): No adjustment recommended.
Severe liver dysfunction (Child-Pugh C): Not recommended.

Dose Adjustments

Coadministration with cyclosporine: Dose should be reduced to 240 mg orally or IV once a day.


  • If cyclosporine is begun after starting this drug, the next dose of this drug should be reduced to 240 mg once a day.
  • If cyclosporine is stopped after starting this drug, the next dose of this drug should be increased to 480 mg once a day.
  • If dosing of cyclosporine is interrupted due to high cyclosporine levels, no dose adjustment of this drug is necessary.



  • Coadministration with pimozide, ergot alkaloids
  • With cyclosporine: Coadministration with pitavastatin, simvastatin

Safety and efficacy have not been established in patients younger than 18 years.

Consult WARNINGS section for additional precautions.


Insufficient data to make dosing recommendations

Other Comments

Administration advice:

  • IV: The diluted solution must be administered through a sterile 0.2 micron or 0.22 micron polyethersulfone (PES) in-line filter; do not administer through a filter other than a sterile 0.2 micron or 0.22 micron PES in-line filter.
  • IV: Administer by IV infusion via a peripheral catheter or central venous line; infuse at a constant rate over 1 hour. Do not administer as IV bolus injection.
  • IV: Do not coadminister through the same IV line (or cannula) with other drug products and diluent combinations (except those listed as compatible below).
  • IV: Only use the IV formulation (which contains hydroxypropyl betadex) in patients unable to take oral therapy; switch patients to oral formulation as soon as they can take oral products.
  • Oral: Administer with or without food.
  • Oral: Swallow tablets whole.
  • May use the oral and IV formulations interchangeably (no dose adjustment needed) at physician's discretion
  • Consult the manufacturer product information regarding missed doses.

Storage requirements:
  • Injection (prior to dilution): Store vials at 20C to 25C (68F to 77F); excursions permitted to 15C to 30C (59F to 86F). Store in original carton to protect from light.
  • Injection (after dilution): The diluted solution is stable for up to 24 hours at room temperature or up to 48 hours under refrigeration at 2C to 8C (36F to 46F); this time includes storage in the IV bag through the duration of infusion.
  • Tablets: Store in original package until use. Store at 20C to 25C (68F to 77F); excursions permitted to 15C to 30C (59F to 86F).

Reconstitution/preparation techniques:
  • Injection: Must be diluted before IV use
  • Injection: Do not use with IV bags and infusion set materials containing the plasticizer diethylhexyl phthalate (DEHP); only use with IV bags and infusion set materials that are DEHP-free (phthalate-free materials are also DEHP-free).
  • Injection: The manufacturer product information should be consulted.

IV compatibility:
  • COMPATIBLE DILUENTS: 0.9% Sodium Chloride Injection, USP; 5% Dextrose Injection, USP
  • In 0.9% Sodium Chloride Injection, USP: Ampicillin sodium, ampicillin sodium-sulbactam sodium, anti-thymocyte globulin, caspofungin, daptomycin, fentanyl citrate, fluconazole, furosemide, human insulin, magnesium sulfate, methotrexate, micafungin
  • In 5% Dextrose Injection, USP: Amphotericin B lipid complex, anidulafungin, cefazolin sodium, ceftaroline, ceftriaxone sodium, doripenem, famotidine, folic acid, ganciclovir sodium, hydrocortisone sodium succinate, morphine sulfate, norepinephrine bitartrate, pantoprazole sodium, potassium chloride, potassium phosphate, tacrolimus, telavancin, tigecycline
  • IV bag materials: Polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyolefin (polypropylene and polyethylene)
  • Infusion set materials: PVC, polyethylene (PE), polybutadiene (PBD), silicone rubber (SR), styrene-butadiene copolymer (SBC), styrene-butadiene-styrene copolymer (SBS), polystyrene (PS)
  • Plasticizers: Tris (2-ethylhexyl) trimellitate (TOTM), benzyl butyl phthalate (BBP)
  • Catheters: Radiopaque polyurethane
  • PHYSICALLY INCOMPATIBLE DRUG PRODUCTS: Amphotericin B liposomal, amiodarone hydrochloride (HCl), aztreonam, cefepime HCl, ciprofloxacin, cyclosporine, diltiazem HCl, filgrastim, gentamicin sulfate, levofloxacin, linezolid, lorazepam, midazolam HCl, mycophenolate mofetil HCl, ondansetron, palonosetron
  • INCOMPATIBLE IV BAGS AND INFUSION SET MATERIALS: Polyurethane-containing IV administration set tubing, DEHP plasticizers
  • Do not mix with other products.

  • Injection: A clear colorless solution; may contain a few product-related small translucent or white particles

  • Infections/Infestations: For CMV reactivation (upon completion of prophylaxis)
  • Renal: Serum creatinine levels in patients with CrCl less than 50 mL/min using the IV formulation

Patient advice:
  • Read the US FDA-approved patient labeling (Patient Information).
  • Avoid missing doses and complete the entire course of therapy.
  • Store tablets in original package until use.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.