Valtrex

brand

Valtrex Side Effects

Nausea, stomach pain, headache, or dizziness may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she 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: mental/mood changes (such as agitation, confusion, hallucinations), trouble speaking, shaky/unsteady movements, signs of kidney problems (such as change in the amount of urine).

This medication may rarely cause a life-threatening disorder that affects the blood cells, kidneys, and other parts of the body. This disorder is more likely to occur if you have conditions related to a weakened immune system (such as HIV disease, bone marrow transplant, kidney transplant). Get medical help right away if you have any serious side effects, including: extreme tiredness, slow/fast/irregular heartbeat, easy bruising/bleeding, new fever, bloody/dark urine, severe stomach/abdominal pain, yellowing eyes/skin, sudden vision changes, loss of consciousness, seizures.

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.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
  • hemolytic uremic syndrome
  • thrombocytopenic disorder
  • neutropenic disorder
  • drug-induced psychosis
  • acute confusion
  • manic disorder
  • agitation
  • aggressive behavior
  • encephalopathy
  • visual changes
  • hypertension
  • thrombotic thrombocytopenic purpura
  • constipation
  • hepatitis
  • renal failure
  • dysmenorrhea
  • skin photosensitivity
  • erythema multiforme
  • pruritus of skin
  • alopecia
  • urticaria
  • arthralgia
  • coma
  • hallucinations
  • seizure disorder
  • dizziness
  • fatigue
  • tremor
  • ataxia
  • skin rash
  • facial edema
  • anorexia
  • headache disorder
  • dyspnea
  • nausea
  • vomiting
  • diarrhea
  • anaphylaxis
  • angioedema
  • acute abdominal pain
  • renal pain
  • tachycardia
  • increased alanine transaminase

Drug Interactions

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug include: other drugs that may cause kidney problems (including nonsteroidal anti-inflammatory drugs-NSAIDs such as ibuprofen, naproxen).

Valacyclovir is very similar to acyclovir. Do not use medications containing acyclovir while using valacyclovir.