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. Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing. There is a problem with information submitted for this request. Sign up for free, and stay up-to-date on research advancements, health tips and current health topics, like COVID, plus expert advice on managing your health. Error Email field is required. Error Include a valid email address. To provide you with the most relevant and helpful information and to understand which information is beneficial, we may combine your e-mail and website usage information with other information we have about you.
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This is not a complete list of side effects. Other side effects may occur. Consult your healthcare provider if you have questions about side effects of Valtrex. A frequently asked question about Valtrex is whether it will make you urinate more often. Therefore, this extra hydration can result in frequent urination. If you have any signs of an allergic reaction like difficulty breathing, hives, or swelling of the face, mouth, or throat, you should seek immediate emergency medical treatment.
Other serious side effects that could potentially occur when taking Valtrex include:. Some patients are more susceptible to these serious side effects than others.
These side effects are very rare. Antiviral medicines are effective at treating viral infections, but after long-term use, they can eventually weaken the immune system by affecting immune cells. This is typically only an issue for seniors and people with weakened immune systems.
Some studies have even shown that the long-term use of Valtrex is well-tolerated for healthy individuals. If you start to have side effects from Valtrex and are thinking about stopping the medication, you should call your doctor before doing so. Abruptly stopping Valtrex can cause new side effects or worsen symptoms. You should talk with your doctor before taking Valtrex if you have any of the following medical conditions:. Elderly adults may have a higher risk of experiencing side effects and are more likely to have kidney problems because of it.
Your doctor may simply recommend a lower dose. Taking Valtrex at the same time as certain other medications may cause additional side effects or complications.
There are currently no known interactions between Valtrex and grapefruit or grapefruit juice, which can sometimes interfere with how much of a drug stays in the body at one time.
Store the oral suspension in a refrigerator and throw away suspension any left over after 28 days of use. Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time. Patients usually notice an improvement in symptoms within a few days of taking valacyclovir, but this will depend on the type of infection you have. Typically, the sooner you start on this medicine, the quicker it will work.
Health Topics. Health Tools. Valtrex Valacyclovir. Generic Name: Valacyclovir. Reviewed: January 4, Tell your doctor if you have ever had: kidney disease or if you are on dialysis ; a weak immune system; HIV or AIDS; or a kidney transplant or bone marrow transplant. Do not give this medicine to a child without medical advice. Side Effects. Side Effects What are the side effects of Valtrex Valacyclovir? Call your doctor at once if you have: confusion, agitation, or you feel shaky or unsteady; hallucinations seeing or hearing things that are not real ; problems with speech; a seizure; or kidney problems --little or no urination, swelling in your feet or ankles, feeling tired or short of breath.
Serious side effects may be more likely in adults who are 65 or older. Stop taking valacyclovir and call your doctor right away if you have any of the following signs of a serious side effect that can harm red blood cells: fever, pale skin; unusual bleeding nosebleeds, bleeding gums ; red or pink urine, little or no urination; purple or red spots on the skin not related to herpes or chickenpox ; feeling weak or tired; stomach pain, bloody diarrhea, vomiting; or swelling in your face, hands, or feet.
Common side effects may include: nausea, stomach pain; or headache. Based on FDA pregnancy categories. Interactions What drugs and food should I avoid while taking Valtrex Valacyclovir? You may take valacyclovir with or without food.
Tell your doctor if a child taking this medicine cannot swallow the valacyclovir tablet. Drink plenty of water while you are taking valacyclovir to keep your kidneys working properly. What should I do if I missed a dose of Valtrex Valacyclovir?
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