Severe leukopenia, neutropenia, anemia, thrombocytopenia, pancytopenia, bone marrow aplasia, and aplastic anemia have been reported during valganciclovir use. Based on animal studies with ganciclovir, valganciclovir has the potential to be carcinogenic, teratogenic, and aspermatogenic in humans .
Viral DNA Polymerase Inhibitor
Guanosine Nucleoside Analog
Valganciclovir is used to treat symptoms of cytomegalovirus (CMV) retinitis, an infection in the eyes of people with acquired immunodeficiency syndrome (AIDS). Valganciclovir will not cure this eye infection, but it may help to keep the symptoms from becoming worse.
Valganciclovir is an antiviral. It is used to treat infections caused by viruses. This medicine is also used to prevent CMV disease in patients who have received an organ transplant (eg, heart, kidney, or kidney-pancreas transplant).
This medicine may cause some serious side effects, including anemia and other blood problems. Before you begin treatment with valganciclovir, you and your doctor should talk about the benefit this medicine will do as well as the risks of using it.
This medicine is available only with your doctor's prescription.
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies performed to date have not demonstrated pediatric-specific problems that would limit the usefulness of valganciclovir for the prevention of CMV disease in kidney and heart transplant children. However, safety and efficacy of valganciclovir for the prevention of CMV disease have not been established in liver transplant children, in kidney transplant children younger than 4 months of age, and in heart transplant children younger than 1 month of age.
Although appropriate studies on the relationship of age to the effects of valganciclovir have not been performed in the geriatric population, no geriatric-specific problems have been documented to date. However, elderly patients are more likely to have age-related liver, kidney, or heart problems, which may require caution and an adjustment in the dose for patients receiving valganciclovir.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco.
Other medical problems
The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:
Take this medicine exactly as directed by your doctor. Do not change the dose or stop using this medicine without checking first with your doctor. When your supply of this medicine is running low, contact your doctor or pharmacist ahead of time. Do not allow yourself to run out of this medicine.
This medicine should come with a patient information insert. Read and follow these instructions carefully. Ask your doctor if you have any questions.
It is important that you take this medicine with food. This is to make sure the medicine is fully absorbed into the body and will work properly.
Swallow the tablet whole. Do not break, crush, or chew it.
Be careful not to handle crushed or broken tablets. If you have contact with broken or crushed tablets or mixed oral liquid, wash your skin with soap and clear water. If the medicine gets into your eyes, rinse them with clear water.
If you are using the oral liquid, use the oral dispenser that comes with the package to measure each dose accurately. The average household teaspoon may not hold the right amount of liquid.
If you are taking ganciclovir (Cytovene®) capsules before switching to valganciclovir (Valcyte®) tablets, the dose of your medicine may change. Although these medicines both treat the same problem, they are absorbed differently by your body. Make sure you understand the new directions for Valcyte® so you do not take too many tablets.
To get the best results, valganciclovir must be given for the full time of treatment. Also, this medicine works best when there is a constant amount in the blood. To help keep the amount constant, valganciclovir must be taken on a regular schedule.
The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Store the mixed oral liquid in the refrigerator. Do not freeze. Throw away any unused medicine after 49 days through community take-back programs when available.
It is very important that your doctor check the progress of you or your child at regular visits to make sure that this medicine is working properly. Blood and urine tests may be needed to check for unwanted effects.
Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. You should not become pregnant while you are taking this medicine and for at least 1 month after stopping it. Also, men should use a condom during treatment with this medicine and for at least 90 days after treatment has been completed. If you think you have become pregnant while using the medicine, tell your doctor right away.
If you plan to have children, talk with your doctor before using this medicine. Some men and women using this medicine have become infertile (unable to have children).
Valganciclovir can temporarily lower the number of white blood cells in your blood, increasing the chance of getting an infection. It can also lower the number of platelets, which are necessary for proper blood clotting. If this occurs, there are certain precautions you can take, especially when your blood count is low, to reduce the risk of infection or bleeding:
This medicine may cause kidney failure, especially in elderly patients with kidney problems. Check with your doctor right away if you have the following symptoms: agitation, coma, confusion, decreased urine output, depression, dizziness, headache, hostility, irritability, lethargy, muscle twitching, nausea, rapid weight gain, seizures, stupor, or swelling of the face, ankles, or hands.
This medicine may cause confusion, seizures, dizziness, drowsiness, or trouble in controlling movements. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.