Dosage & Side Effects

Dosage and Side Effects

Dosage for Valtrex

Valtrex is one of the best antiviral drugs of all time if you want to treat symptoms of herpes. Even though it will not going to help you get rid of the infection completely, it will definitely help your organism fight the virus and make you feel much better during the whole process.

Dosage for Valtrex is the crucial part of the healing process and that is why the first thing everyone who is taking this med needs to know that it is crucial not to take more and not to take less as well than the doctor prescribed. That can only cause some side effects. After you feel burning or blisters, it is necessary to buy this medication and start taking it right away, because as soon as you start the treatment, the faster you are going to feel better.

Don’t forget to take a full glass of water while taking Valtrex because you want to keep your kidneys busy and not to cause any harm to the liver as well. It is a good idea to shake the liquid before measuring a proper dose. You can use the spoon or a cup but it has to be bought at the drugstore or provided by the pharmacy.

In some cases people tend to stop taking the drug simply because they think that it is enough and that they don’t have to take more pills, but the reality is different, since even though you feel better, that doesn’t mean that the virus is going to stop causing you problems.

Some of the rules of dosage for Valtrex include the procedure regarding missing of a dose. That is not a problem if you take the medicine as soon as you remember but if a lot of time passes after that, it is better not to take it at all since you are just going to cause more problems.

Taking extra medicine can make you feel dizzy and in some cases it is possible to overdose. If you are urinating too little or you are not urinating, that means that you have to contact the doctor and tell him all about your problems.

Valtrex is one of a kind medication when it comes to treating herpes viral infections and it is the best drug there is. Millions of people can’t be wrong and if you respect the procedure and dosage for Valtrex, everything will be fine and you are going to feel much better. Even if some of the side effects start causing you problems, it only means that the drug is working properly and it is only a matter of time when you are going to feel better.

Valtrex side effects

Therapeutic action:

Valtrex or Valacyclovir is an antiviral drug. It is a prodrug that through metabolisation is converted into acyclovir. Bioavailability after Valacyclovir hepatic first pass metabolisation reaches 55% unlike when using normal acyclovir only 10-11%.

After Acyclovir reaches the virus infested cell it is converted into aciclo-GTP that later incorporates into the viral DNA, thus resulting in chain termination and unavailability for the virus to replicate.

The overall effect of Valtrex is slowing growth and spread of the virus so that the body can fight it normally. It does not cure the virus completely but it eases the symptoms of the infection.


Valtrex (Valacyclovir) is used to treat the following types of viruses:

  • Cytomegalovirus
  • Varicella zoster virus
  • Herpes simplex virus type I
  • Herpes simplex virus type II
  • Epstein-Barr virus

Though the drug is indicated for:

  • Treatment and prophylaxis of genital herpes
  • Reduction of transmission of herpes simplex
  • Herpes zoster
  • Prophylaxis of Cytomegalovirus disease that may follow organ transplantation.

Consult your doctor for any other conditions that may be treated by Valtrex.

Contradictions and cautions:

You should not use valacyclovir if any of the following apply to you:

  • Undergoing treatment of HIV/AIDS
  • Other conditions that decrease the potency of your immune system
  • Hypersensitivity to acyclovir or valacyclovir
  • Dehydration
  • Kidney or bone marrow transplantation
  • Kidney disease
  • Dosage adjustment may be considered by your doctor in these cases.

Valacyclovir is in FDA pregnancy category B meaning that is is not expected to harm an unborn baby. But you may need to consult your doctor before using it during pregnancy or lactation period. Do not breast-feed while taking Valacyclovir as it may pass into breast milk.

The herpes virus is contagious and may transmit to other people thus it is best to increase the level of your hygiene and use protective measures during sexual intercourse. Valtrex does not prevent the spread of herpes and it is advised to wash your hands thoroughly before and after each meal.

Valtrex Side-effects:

Valtrex like all the other medicine may possesses certain side-effects. If a valtrex side-effect is stated here it does not mean that you may experience it. Serious Valacyclovir side effects may be:

Allergic reaction:

  • swelling
  • hives
  • difficulty breathing and etc.
  • unusual weakness
  • back pain
  • easy bruising
  • fever
  • pail yellow skin, dark urine
  • weight gain, shortness of breath
  • hallucinations
  • anxiety
  • aggression
  • confusion
  • vision and speech problems
  • convulsions

Possible short-term side effects of Valacyclovir are:

  • nausea
  • diarrhea
  • stomach pain
  • vomiting
  • tiredness
  • headaches
  • joint and menstrual pain
  • skin rash
  • sore throat
  • nasal congestion

If any of the above Valtrex side-effects or other unusual effects occur call your doctor immediately and consult him on the possible adequate ways to lower or get rid of them.


Be sure to tell your health care provider of any drug, food supplement or vitamin you are using during the treatment with Valtrex.

Especialy mention the following:

  • Lithium medication like Lithobid and etc.
  • Methotrexate or Trexal
  • NSAID’s like diclofenac, ibuprofen, indomethacin and others
  • Aspirin, Acetaminophen
  • Organ transplant medicine like sirolimus, tacrolimus
  • Ulcer medicine mesalamine, sulfasalazine
  • Last generation antibiotics like amphotericin B, amikacin, bacitracin, kanamycin, vancomycin
  • Antiviral medication cidofovir, adefovir and etc.
  • Cancer treatment tretionin, oxaliplatin, carmustine, cisplatin and others