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Valtrex Side Effects

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.

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.

Valtrex Side Effects Reported to FDA

The following 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.


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.
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 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). The consumer presented with:
  • Transient Ischaemic Attack
  • Meningitis
  • Herpes Zoster
  • Headache
  • Gastric Disorder
  • Eye Pain
  • Dysarthria
  • Hypoaesthesia
  • Trigeminal Neuralgia
which developed 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.

Delirium, Renal Disorder, Dyslalia
This report suggests a potential Valtrex Delirium, Renal Disorder, Dyslalia 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. Soon after starting Valtrex the patient began experiencing various side effects, including:
  • Delirium
  • Renal Disorder
  • Dyslalia
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.

Nephrolithiasis, Renal Colic
This Nephrolithiasis, Renal Colic 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 commencing Valtrex, the patient experienced the following unwanted symptoms/side effects:
  • Nephrolithiasis
  • Renal Colic
The 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.

Toxic Encephalopathy, Insomnia
This is a report of a 90-year-old female patient (weight: NA) from JP. The patient developed the following symptoms/conditions: herpes zoster and was treated with Valtrex (dosage: 1000mg Three Times Per Day) starting Jan 27, 2014. Concurrently used drugs:
  • Arasena-a
Soon after that, the consumer experienced the following side effects:
  • Toxic Encephalopathy
  • Insomnia
This opens a possibility that Valtrex treatment could cause the above reactions, including toxic encephalopathy, and some female subjects may be more susceptible.


Neutropenia, Thrombocytopenia
A 61-year-old female patient (weight: NA) from JP with the following symptoms/conditions: herpes zoster started Valtrex treatment (dosage: 1000mg Three Times Per Day) on Jan 15, 2013. Soon after starting Valtrex treatment, the subject experienced various side effects, including:
  • Neutropenia
  • Thrombocytopenia
Concurrently used drugs:
  • Tegretol
  • Methycobal
  • Juvela N
The patient was hospitalized. This finding indicates that some female patients could be more vulnerable to Valtrex.

Renal Failure Acute, Dysuria, Asthenia
A 91-year-old female patient from JP (weight: NA) experienced symptoms, such as: herpes zoster,neuralgia and was treated with Valtrex(dosage: 1000mg Three Times Per Day). The treatment was initiated on 2011. After that a consumer reported the following side effect(s):
  • Renal Failure Acute
  • Dysuria
  • Asthenia
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Valtrex efficacy:
  • Lyrica (75mg Per Day)
  • Glimicron
  • Coniel
  • Micardis
  • Bonalon
The patient was hospitalized.

Delirium, Restlessness, Hallucination, Hallucination, Auditory, Poriomania, Insomnia, Delusion
In this report, Valtrex was administered for the following condition: herpes virus infection.A 79-year-old male consumer from JP (weight: NA) started Valtrex treatment (dosage: 500mg Per Day) on Jan 17, 2014.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Delirium
  • Restlessness
  • Hallucination
  • Hallucination, Auditory
  • Poriomania
  • Insomnia
  • Delusion
A possible interaction with other drugs could have contributed to this reaction: NA.Establishing a causal relationship between a specific drug and consumer's side effects is complex, but it is possible that in this report Valtrex treatment could be related to the listed above side effect(s).

Encephalopathy, Renal Failure, Rash
This is a report of the following Valtrex side effect(s):
  • Encephalopathy
  • Renal Failure
  • Rash
A 83-year-old male patient from JP (weight: NA) presented with the following condition: herpes zoster and received a treatment with Valtrex (dosage: NA) starting: Jan 27, 2014.The following concurrently used drugs could have generated interactions:
  • Aciclovir
The patient was hospitalized.This report suggests that a Valtrex treatment could be associated with the listed above side effect(s).

Altered State Of Consciousness, Hyponatraemia, Cognitive Disorder, Disorientation
This Valtrex report was submitted by a 86-year-old female consumer from JP (weight: NA). The patient was diagnosed with: herpes zoster and Valtrex was administered (dosage: 1000mg Three Times Per Day) starting: Dec 28, 2013. The consumer developed a set of symptoms:
  • Altered State Of Consciousness
  • Hyponatraemia
  • Cognitive Disorder
  • Disorientation
Other drugs used simultaneously: NA.Those unexpected symptoms could be linked to a Valtrex treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Asthenia, Fall
This is a report of a possible correlation between Valtrex use and the following symptoms/side effect(s):
  • Asthenia
  • Fall
which could contribute to an assessment of Valtrex risk profile.A 95-year-old female consumer from US (weight: NA) was suffering from herpes zoster and was treated with Valtrex (dosage: 1000mg Three Times Per Day) starting NS.Other concurrent medications: NA.

Blood Urine Present
A 31-year-old male patient from US (weight: NA) presented with the following symptoms: genital herpes and after a treatment with Valtrex (dosage: 1000mg As Required) experienced the following side effect(s):
  • Blood Urine Present
The treatment was started on 1995. Valtrex was used in combination with the following drugs: NA.This report could alert potential Valtrex consumers.

Pruritus, Hyperhidrosis, Nausea, Herpes Virus Infection
In this report, a 60-year-old female patient from US (weight: NA) was affected by a possible Valtrex side effect.The patient was diagnosed with genital herpes,neuralgia. After a treatment with Valtrex (dosage: 500mg Twice Per Day, start date: 2008), the patient experienced the following side effect(s):
  • Pruritus
  • Hyperhidrosis
  • Nausea
  • Herpes Virus Infection
The following simultaneously used drugs could have led to this reaction:
  • Lyrica (75mg Per Day)
  • Flexeril (10mg Three Times Per Day)
  • Lortab (1tab Twice Per Day)
  • Corgard
  • Lovastatin
  • Estradiol
  • Allopurinol
  • Prilosec
The findings here stress that side effects should be taken into consideration when evaluating a Valtrex treatment.

Knee Operation, Treatment Noncompliance, Adverse Event
This is a report of a 76-year-old female patient from US (weight: NA), who used Valtrex (dosage: NA) for a treatment of herpes zoster. After starting a treatment on Jan 14, 2009, the patient experienced the following side effect(s):
  • Knee Operation
  • Treatment Noncompliance
  • Adverse Event
The following drugs could possibly have interacted with the Valtrex treatment NA.Taken together, these observations suggest that a Valtrex treatment could be related to side effect(s), such as Knee Operation, Treatment Noncompliance, Adverse Event.

Off Label Use
This off label use side effect was reported by a consumer or non-health professional from US. A 67-year-old male patient (weight:NA) experienced the following symptoms/conditions: herpes zoster. The patient was prescribed Valtrex (dosage: 1g Twice Per Day), which was started on Jun 18, 2013. Concurrently used drugs: NA. When starting to take Valtrex the consumer reported the following symptoms:
  • Off Label Use
These side effects may potentially be related to Valtrex.

Abdominal Discomfort
This is a Valtrex side effect report of a 71-year-old female patient (weight:NA) from US, suffering from the following symptoms/conditions: genital herpes, who was treated with Valtrex (dosage:NA, start time: NS), combined with: NA., and developed a serious reaction and a abdominal discomfort side effect. The patient presented with:
  • Abdominal Discomfort
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Valtrex treatment in female patients suffering from genital herpes, resulting in abdominal discomfort.

Chest Pain, Pain In Extremity, Hypertension
This report suggests a potential Valtrex chest pain side effect(s) that can have serious consequences. A 51-year-old female patient from US (weight:NA) was diagnosed with the following health condition(s): herpes virus infection and used Valtrex (dosage: NA) starting Feb 03, 2009. Soon after starting Valtrex the patient began experiencing various side effects, including:
  • Chest Pain
  • Pain In Extremity
  • Hypertension
Drugs used concurrently:NA. Although Valtrex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as chest pain, may still occur.

Prescribed Overdose
This prescribed overdose problem was reported by a consumer or non-health professional from US. A 10-year-old patient (weight: NA) was diagnosed with the following medical condition(s): herpes zoster.On NS a consumer started treatment with Valtrex (dosage: 6g Per Day). The following drugs/medications were being taken at the same time: NA. When commencing Valtrex, the patient experienced the following unwanted symptoms /side effects:
  • Prescribed Overdose
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as prescribed overdose, may become evident only after a product is in use by the general population.

Leukopenia, Mean Cell Volume Increased, Anaemia
This is a Valtrex side effect report of a 54-year-old male patient (weight: NA) from US. The patient developed the following symptoms/conditions: genital herpes and was treated with Valtrex (dosage: 1g Per Day) starting NS. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Leukopenia
  • Mean Cell Volume Increased
  • Anaemia
This opens a possibility that Valtrex could cause leukopenia and that some male patients may be more susceptible.

Treatment Noncompliance
A 30-year-old female patient (weight: NA) from US with the following symptoms: antiviral prophylaxis started Valtrex treatment (dosage: 500mg Twice Per Day) on 2009. Soon after starting Valtrex treatment, the consumer experienced several side effects, including:
  • Treatment Noncompliance
. Concurrently used drugs:
  • Acyclovir (400mg Twice Per Day)
  • Trivora
This finding indicates that some patients can be more vulnerable to developing Valtrex side effects, such as treatment noncompliance.

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 (dosage: 500mg Twice Per Day), which was started on NS. Concurrently used drugs:
  • Catapres
  • Hormone Replacement
.When starting to take Valtrex the consumer reported symptoms, such as:
  • Hair Growth Abnormal
These side effects may potentially be related to Valtrex.

Hallucination
This is a report of a 30-year-old female patient (weight: NA) from US, suffering from the following 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). The consumer presented with:
  • Hallucination
which developed 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.

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. Soon after starting Valtrex the patient began experiencing various side effects, including:
  • Treatment Failure
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.

Genital Herpes, Ill-defined Disorder, Skin Discolouration, Skin Lesion, Pain, Prescribed Overdose, Product Quality Issue
This Genital Herpes, Ill-defined Disorder, Skin Discolouration, Skin Lesion, Pain, Prescribed Overdose, Product Quality Issue 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 commencing Valtrex, the patient experienced the following unwanted symptoms/side effects:
  • Genital Herpes
  • Ill-defined Disorder
  • Skin Discolouration
  • Skin Lesion
  • Pain
  • Prescribed Overdose
  • Product Quality Issue
Although 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.

Therapeutic Response Unexpected
This is a report of a 54-year-old female patient (weight: NA) from US. The patient developed the following symptoms/conditions: oral herpes and was treated with Valtrex (dosage: 1tab Per Day) starting 2004. Concurrently used drugs:
  • Naproxen
Soon after that, the consumer experienced the following side effects:
  • Therapeutic Response Unexpected
This opens a possibility that Valtrex treatment could cause the above reactions, including therapeutic response unexpected, and some female subjects may be more susceptible.

Hepatic Enzyme Increased
A 48-year-old male patient (weight: NA) from US with the following symptoms/conditions: herpes simplex started Valtrex treatment (dosage: 500mg Twice Per Day) on 2006. Soon after starting Valtrex treatment, the subject experienced various side effects, including:
  • Hepatic Enzyme Increased
Concurrently used drugs: NA. This finding indicates that some male patients could be more vulnerable to Valtrex.

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Keep Track of Side Effects

Note Your Observations

It is really important to keep of your 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

    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.


    Discuss Valtrex Side Effects

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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