Letermovir: Indication, Dosage, Side Effect
Indication:
Letermovir is indicated for the prevention of cytomegalovirus (CMV) infection and disease in adult patients who have received an allogeneic hematopoietic stem cell transplant (HSCT) and are CMV-seropositive, meaning they have been exposed to the virus before. After a transplant, the immune system is very weak, and dormant viruses like CMV can become active and cause serious illness. Letermovir helps prevent this by blocking a key step in the virus's replication process. It does not treat active CMV infection but is effective in reducing the chance of the virus reactivating in high-risk patients. Starting Letermovir early after transplant helps protect patients during the critical recovery period.
Dosage:
Letermovir is an antiviral medication mainly used to prevent cytomegalovirus (CMV) infection in adults who have received a stem cell transplant and are at risk of CMV reactivation. The typical dosage is 480 mg taken once daily by mouth, starting shortly after the transplant (usually within the first 28 days) and continuing for up to 100 days. If Letermovir is taken along with certain other drugs like cyclosporine, the dose is reduced to 240 mg once daily due to drug interactions. Letermovir works by blocking a specific viral enzyme needed for CMV to multiply, helping protect patients when their immune system is still weak after the transplant. The medicine can be taken with or without food, but it’s important to take it at the same time every day for the best protection.
Extra notes:
Letermovir is not used to treat active CMV infection—only to prevent it.
Dose adjustments may be needed based on other medications.
Missing doses can increase the risk of CMV infection, so adherence is very important.
Side Effect:
The most common side effects of Letermovir are:
Nausea, diarrhea, vomiting, swelling ankles/feet, cough, or headache. Tell your doctor or pharmacist right away if any of these side effects persist or worsen.
Remember that your doctor has prescribed this medication because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor right away if you have any serious side effects, including: fast/irregular heartbeat.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
Take this medication regularly to get the most benefit from it. To help you remember, take it at the same times on the days your doctor directs.
This is not a complete list of possible side effects. Contact your doctor or pharmacist if you have any other side effects not listed above.
FAQ:
Frequently Asked Questions Regarding (LETERMOVIR) / Generic PREVYMIS LETERMOVIR:
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LETERMOVIR has different brand names depending on the manufacturer. Some of the brand names are:
