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Valtrex Side Effects

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Common Valtrex Side Effects


The most commonly reported Valtrex side effects (click to view or check a box to report):

Renal Failure Acute (522)
Dizziness (449)
Nausea (423)
Dysarthria (392)
Depressed Level Of Consciousness (354)
Altered State Of Consciousness (346)
Blood Creatinine Increased (336)
Vomiting (276)
Encephalopathy (266)
Headache (260)
Blood Urea Increased (236)
Hallucination (224)
Delirium (222)
Malaise (218)
Nervous System Disorder (187)
Gait Disturbance (181)
Overdose (157)
Decreased Appetite (157)
Asthenia (155)
Anorexia (154)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Valtrex Side Effects Reported to FDA



Valtrex Side Effect Report#9996348
Transient Ischaemic Attack, Meningitis, Herpes Zoster, Headache, Gastric Disorder, Eye Pain, Dysarthria, Hypoaesthesia, Trigeminal Neuralgia
This is a report of a 52-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: genital herpes, who was treated with Valtrex (dosage: 1g Per Day, start time: 2000), combined with:
  • Coumadin
and developed a serious reaction and side effect(s): Transient Ischaemic Attack, Meningitis, Herpes Zoster, Headache, Gastric Disorder, Eye Pain, Dysarthria, Hypoaesthesia, Trigeminal Neuralgia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in female patients, resulting in Transient Ischaemic Attack side effect. The patient was hospitalized.
Valtrex Side Effect Report#9925674
Delirium, Renal Disorder, Dyslalia
This report suggests a potential Valtrex Delirium side effect(s) that can have serious consequences. A 84-year-old female patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: herpes zoster and used Valtrex (dosage: 1000mg Three Times Per Day) starting
Jan 31, 2014. After starting Valtrex the patient began experiencing various side effects, including: Delirium, Renal Disorder, DyslaliaAdditional drugs used concurrently:
  • Voltaren (25mg Three Times Per Day)
  • Coniel
  • Mecobalamin
  • Eurodin
The patient was hospitalized. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Delirium, may still occur.
Valtrex Side Effect Report#9909621
Nephrolithiasis, Nephrolithiasis, Renal Colic
This Nephrolithiasis problem was reported by a consumer or non-health professional from US. A 28-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: herpes virus infection. On 2006 this consumer started treatment with Valtrex (dosage: 1tab Per Day). The following drugs were being taken at the same time:
  • Lamictal
When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Nephrolithiasis, Nephrolithiasis, Renal ColicThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Nephrolithiasis, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9901896
Toxic Encephalopathy, Insomnia
This Toxic Encephalopathy side effect was reported by a pharmacist from JP. A 90-year-old female patient (weight:NA) experienced the following symptoms/conditions: herpes zoster.The patient was prescribed Valtrex (drug dosage: 1000mg Three Times Per Day), which was initiated on
Jan 27, 2014. Concurrently used drugs:
  • Arasena-a
.After starting to take Valtrex the consumer reported adverse symptoms, such as: Toxic Encephalopathy, InsomniaThese side effects may potentially be related to Valtrex.
Valtrex Side Effect Report#9901891
Neutropenia, Thrombocytopenia
This is a report of a 61-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: herpes zoster, who was treated with Valtrex (dosage: 1000mg Three Times Per Day, start time:
Jan 15, 2013), combined with:
  • Tegretol
  • Methycobal
  • Juvela N
and developed a serious reaction and side effect(s): Neutropenia, Thrombocytopenia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in female patients, resulting in Neutropenia side effect. The patient was hospitalized.
Valtrex Side Effect Report#9898993
Renal Failure Acute, Dysuria, Asthenia
This report suggests a potential Valtrex Renal Failure Acute side effect(s) that can have serious consequences. A 91-year-old female patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: herpes zoster,neuralgia and used Valtrex (dosage: 1000mg Three Times Per Day) starting 2011. After starting Valtrex the patient began experiencing various side effects, including: Renal Failure Acute, Dysuria, AstheniaAdditional drugs used concurrently:
  • Lyrica (75mg Per Day)
  • Glimicron
  • Coniel
  • Micardis
  • Bonalon
The patient was hospitalized. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Renal Failure Acute, may still occur.
Valtrex Side Effect Report#9885979
Delirium, Restlessness, Hallucination, Hallucination, Auditory, Poriomania, Insomnia, Delusion
This Delirium problem was reported by a physician from JP. A 79-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: herpes virus infection. On
Jan 17, 2014 this consumer started treatment with Valtrex (dosage: 500mg Per Day). The following drugs were being taken at the same time: NA. When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Delirium, Restlessness, Hallucination, Hallucination, Auditory, Poriomania, Insomnia, DelusionAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Delirium, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9871296
Encephalopathy, Renal Failure, Rash
This Encephalopathy side effect was reported by a pharmacist from JP. A 83-year-old male patient (weight:NA) experienced the following symptoms/conditions: herpes zoster.The patient was prescribed Valtrex (drug dosage: NA), which was initiated on
Jan 27, 2014. Concurrently used drugs:
  • Aciclovir
.After starting to take Valtrex the consumer reported adverse symptoms, such as: Encephalopathy, Renal Failure, RashThese side effects may potentially be related to Valtrex. The patient was hospitalized.
Valtrex Side Effect Report#9871289
Altered State Of Consciousness, Hyponatraemia, Cognitive Disorder, Disorientation
This is a report of a 86-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: herpes zoster, who was treated with Valtrex (dosage: 1000mg Three Times Per Day, start time:
Dec 28, 2013), combined with: NA. and developed a serious reaction and side effect(s): Altered State Of Consciousness, Hyponatraemia, Cognitive Disorder, Disorientation after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in female patients, resulting in Altered State Of Consciousness side effect.
Valtrex Side Effect Report#9870079
Asthenia, Fall
This report suggests a potential Valtrex Asthenia side effect(s) that can have serious consequences. A 95-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: herpes zoster and used Valtrex (dosage: 1000mg Three Times Per Day) starting NS. After starting Valtrex the patient began experiencing various side effects, including: Asthenia, FallAdditional drugs used concurrently: NA. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Asthenia, may still occur.
Valtrex Side Effect Report#9870073
Blood Urine Present
This Blood Urine Present problem was reported by a consumer or non-health professional from US. A 31-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: genital herpes. On 1995 this consumer started treatment with Valtrex (dosage: 1000mg As Required). The following drugs were being taken at the same time: NA. When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Blood Urine PresentAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Blood Urine Present, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9870066
Pruritus, Hyperhidrosis, Nausea, Herpes Virus Infection
This Pruritus side effect was reported by a consumer or non-health professional from US. A 60-year-old female patient (weight:NA) experienced the following symptoms/conditions: genital herpes,neuralgia.The patient was prescribed Valtrex (drug dosage: 500mg Twice Per Day), which was initiated on 2008. Concurrently used drugs:
  • Lyrica (75mg Per Day)
  • Flexeril (10mg Three Times Per Day)
  • Lortab (1tab Twice Per Day)
  • Corgard
  • Lovastatin
  • Estradiol
  • Allopurinol
  • Prilosec
.After starting to take Valtrex the consumer reported adverse symptoms, such as: Pruritus, Hyperhidrosis, Nausea, Herpes Virus InfectionThese side effects may potentially be related to Valtrex.
Valtrex Side Effect Report#9870058
Knee Operation, Treatment Noncompliance, Adverse Event
This is a report of a 76-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: herpes zoster, who was treated with Valtrex (dosage: NA, start time:
Jan 14, 2009), combined with: NA. and developed a serious reaction and side effect(s): Knee Operation, Treatment Noncompliance, Adverse Event after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in female patients, resulting in Knee Operation side effect.
Valtrex Side Effect Report#9870037
Off Label Use
This report suggests a potential Valtrex Off Label Use side effect(s) that can have serious consequences. A 67-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: herpes zoster and used Valtrex (dosage: 1g Twice Per Day) starting
Jun 18, 2013. After starting Valtrex the patient began experiencing various side effects, including: Off Label UseAdditional drugs used concurrently: NA. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Off Label Use, may still occur.
Valtrex Side Effect Report#9870036
Abdominal Discomfort
This Abdominal Discomfort problem was reported by a consumer or non-health professional from US. A 71-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: genital herpes. On NS this consumer started treatment with Valtrex (dosage: NA). The following drugs were being taken at the same time: NA. When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Abdominal DiscomfortAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Abdominal Discomfort, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9870032
Chest Pain, Pain In Extremity, Hypertension
This Chest Pain side effect was reported by a consumer or non-health professional from US. A 51-year-old female patient (weight:NA) experienced the following symptoms/conditions: herpes virus infection.The patient was prescribed Valtrex (drug dosage: NA), which was initiated on
Feb 03, 2009. Concurrently used drugs: NA..After starting to take Valtrex the consumer reported adverse symptoms, such as: Chest Pain, Pain In Extremity, HypertensionThese side effects may potentially be related to Valtrex.
Valtrex Side Effect Report#9870027
Prescribed Overdose
This is a report of a 10-year-old patient (weight: NA) from US, suffering from the following health symptoms/conditions: herpes zoster, who was treated with Valtrex (dosage: 6g Per Day, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Prescribed Overdose after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in patients, resulting in Prescribed Overdose side effect.
Valtrex Side Effect Report#9870025
Leukopenia, Mean Cell Volume Increased, Anaemia
This report suggests a potential Valtrex Leukopenia side effect(s) that can have serious consequences. A 54-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: genital herpes and used Valtrex (dosage: 1g Per Day) starting NS. After starting Valtrex the patient began experiencing various side effects, including: Leukopenia, Mean Cell Volume Increased, AnaemiaAdditional drugs used concurrently: NA. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Leukopenia, may still occur.
Valtrex Side Effect Report#9870008
Treatment Noncompliance
This Treatment Noncompliance problem was reported by a consumer or non-health professional from US. A 30-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: antiviral prophylaxis. On 2009 this consumer started treatment with Valtrex (dosage: 500mg Twice Per Day). The following drugs were being taken at the same time:
  • Acyclovir (400mg Twice Per Day)
  • Trivora
When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Treatment NoncomplianceAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Treatment Noncompliance, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9870007
Hair Growth Abnormal
This Hair Growth Abnormal side effect was reported by a consumer or non-health professional from US. A 65-year-old female patient (weight:NA) experienced the following symptoms/conditions: herpes zoster.The patient was prescribed Valtrex (drug dosage: 500mg Twice Per Day), which was initiated on NS. Concurrently used drugs:
  • Catapres
  • Hormone Replacement
.After starting to take Valtrex the consumer reported adverse symptoms, such as: Hair Growth AbnormalThese side effects may potentially be related to Valtrex.
Valtrex Side Effect Report#9870001
Hallucination
This is a report of a 30-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: herpes zoster, who was treated with Valtrex (dosage: 1tab Twice Per Day, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Hallucination after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in female patients, resulting in Hallucination side effect.
Valtrex Side Effect Report#9870000
Treatment Failure
This report suggests a potential Valtrex Treatment Failure side effect(s) that can have serious consequences. A 66-year-old patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Valtrex (dosage: NA) starting NS. After starting Valtrex the patient began experiencing various side effects, including: Treatment FailureAdditional drugs used concurrently: NA. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Treatment Failure, may still occur.
Valtrex Side Effect Report#9869978
Genital Herpes, Ill-defined Disorder, Skin Discolouration, Skin Lesion, Pain, Prescribed Overdose, Product Quality Issue
This Genital Herpes problem was reported by a consumer or non-health professional from US. A 78-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: genital herpes. On 2008 this consumer started treatment with Valtrex (dosage: 1g Twice Per Day). The following drugs were being taken at the same time:
  • Procardia
  • Citracal
When using Valtrex, the patient experienced the following unwanted symptoms/side effects: Genital Herpes, Ill-defined Disorder, Skin Discolouration, Skin Lesion, Pain, Prescribed Overdose, Product Quality IssueAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Genital Herpes, may become evident only after a product is in use by the general population.
Valtrex Side Effect Report#9869976
Therapeutic Response Unexpected
This Therapeutic Response Unexpected side effect was reported by a consumer or non-health professional from US. A 54-year-old female patient (weight:NA) experienced the following symptoms/conditions: oral herpes.The patient was prescribed Valtrex (drug dosage: 1tab Per Day), which was initiated on 2004. Concurrently used drugs:
  • Naproxen
.After starting to take Valtrex the consumer reported adverse symptoms, such as: Therapeutic Response UnexpectedThese side effects may potentially be related to Valtrex.
Valtrex Side Effect Report#9869975
Hepatic Enzyme Increased
This is a report of a 48-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: herpes simplex, who was treated with Valtrex (dosage: 500mg Twice Per Day, start time: 2006), combined with: NA. and developed a serious reaction and side effect(s): Hepatic Enzyme Increased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Valtrex treatment in male patients, resulting in Hepatic Enzyme Increased side effect.


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The appearance of Valtrex on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.


What are common Valtrex Side Effects for Women?

Women Side EffectsReports
Renal Failure Acute 392
Nausea 320
Dizziness 292
Blood Creatinine Increased 246
Depressed Level Of Consciousness 234
Altered State Of Consciousness 216
Dysarthria 209
Vomiting 209
Headache 181
Blood Urea Increased 180

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Valtrex reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

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    Valtrex Safety Alerts, Active Ingredients, Usage Information

    NDC0173-0565
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameVALTREX
    Namevalacyclovir hydrochloride
    Dosage FormTABLET, FILM COATED
    RouteORAL
    On market since20020812
    LabelerGlaxoSmithKline LLC
    Active Ingredient(s)VALACYCLOVIR HYDROCHLORIDE
    Strength(s)1
    Unit(s)g/1
    Pharma ClassDNA Polymerase Inhibitors [MoA],Herpes Simplex Virus Nucleoside Analog DNA Polymerase Inhibitor [EPC

    Valtrex Dosage, Warnings, Usage.

    Side Effects reported to FDA: 3949

    Valtrex safety alerts: No

    Reported deaths: 110

    Reported hospitalizations: 2017

    Latest Valtrex clinical trials