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Valtrex Side Effects

Report Valtrex Side Effects

If you experienced any harmful or unwanted effects of Valtrex, please share your experience. This could help to raise awareness about Valtrex side effects, identify uknown risks and inform health professionals and patients taking Valtrex.

Examples: headache, dizziness


The most commonly reported Valtrex side effects are:
Hypertension (4 reports)
Neuropathy (3 reports)
Blurred Vision (2 reports)
Fatigue (2 reports)
Also Some Panic (1 reports)
Arrythmia (1 reports)
Bleeding (1 reports)
Breathing Difficulty Tightness In Chest Cant Take (1 reports)
Chest Pain (1 reports)

If you have experienced a side effect listed above, you can check a box to report it.


To view a complete list of submitted side effects, please follow the link Valtrex side effects . You can also compare Valtrex side effects or view FDA reports.

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).
The 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 identified a causal relationship between the drug and the listed risk.

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Blood Bilirubin Increased, Jaundice, Haemolysis, Hepatic Enzyme Increased
on Jan 30, 2014 Male from CH , 60 years of age, was diagnosed with and was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: blood bilirubin increased, jaundice, haemolysis, hepatic enzyme increased. Valtrex dosage: 500mg Twice Per Day.
Associated medications used:
  • Zovirax (250mg Per Day)
  • Endoxan (5160mg Per Day)
  • Busulfan (69mg See Dosage Text)
  • Atg (500mg See Dosage Text)
  • Methotrexate (20mg See Dosage Text)
  • Sandimmun (250mg See Dosage Text)
  • Solu-medrol (80mg Per Day)
  • Amikin (500mg Twice Per Day)
Patient was hospitalized.

Delirium, Restlessness
Patient was taking Valtrex. Patient felt the following Valtrex side effects: delirium, restlessness on Jan 30, 2014 from JP Additional patient health information: Female , 85 years of age, . Valtrex dosage: N/A.

Anuria, Nausea, Vomiting, Decreased Appetite
Adverse event was reported on Feb 03, 2014 by a Female taking Valtrex (Dosage: 2g Three Times Per Day) was diagnosed with and. Location: JP , 84 years of age, After Valtrex was administered, patient encountered several Valtrex side effects: anuria, nausea, vomiting, decreased appetite.
Multiple concurrent drugs taken:
  • Plavix
  • Gasport-d (20mg Per Day)
  • Amlodipine (5mg Per Day)
  • Blopress (12mg Per Day)
  • Nifedipine Cr (20mg Per Day)
  • Ambroxol Hydrochloride (15mg Three Times Per Day)
  • Sennaride (24mg Per Day)
Patient was hospitalized.

Toxic Encephalopathy, Altered State Of Consciousness, Renal Disorder
on Mar 12, 2014 Female from JP , 88 years of age, was diagnosed with and was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: toxic encephalopathy, altered state of consciousness, renal disorder. Valtrex dosage: 1000mg Three Times Per Day.
Associated medications used:
  • Nifedipine (40mg Per Day)
  • Renivace (5mg Per Day)
  • Crestor (2.5mg Per Day)
  • Carvedilol (2.5mg Per Day)
  • Bayaspirin (100mg Per Day)
  • Merislon (6mg Three Times Per Day)
  • Furosemide
Patient was hospitalized.


Toxic Encephalopathy, Loss Of Consciousness
on Jan 27, 2014 Female from JP , 95 years of age, was diagnosed with and was treated with Valtrex. Patient felt the following Valtrex side effects: toxic encephalopathy, loss of consciousness. Valtrex dosage: 500mg Three Times Per Day.
Multiple prescriptions taken:
  • Amaryl (.5mg Per Day)
  • Furosemide (40mg Per Day)
  • Argamate (1iuax Three Times Per Day)
Patient was hospitalized.

Dysarthria, Dizziness, Hallucination, Toxicity To Various Agents
Patient was taking Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: dysarthria, dizziness, hallucination, toxicity to various agents on Jan 14, 2014 from JP Additional patient health information: Male , 71 years of age, was diagnosed with and. Valtrex dosage: 1000mg Three Times Per Day. Patient was hospitalized.

Liver Disorder, Malnutrition, Hyponatraemia
Adverse event was reported on Jan 16, 2014 by a Male taking Valtrex (Dosage: 1000mg Three Times Per Day) was diagnosed with
  • varicella
  • coronary angioplasty
  • antipyresis
  • nasopharyngitis
and. Location: JP , 68 years of age, Directly after, patient experienced the unwanted or unexpected Valtrex side effects: liver disorder, malnutrition, hyponatraemia.
Associated medications used:
  • Bayaspirin (100mg Per Day)
  • Loxoprofen
  • Pl (1g Three Times Per Day)
  • Flomox (100mg Three Times Per Day)
  • Metgluco (250mg Per Day)
  • Amlodipine (2.5mg Per Day)
  • Plavix (75mg Per Day)
  • Pariet (10mg Per Day)


Encephalitis Viral, Toxic Encephalopathy, Renal Failure, Nervous System Disorder, Confusional State
on Jan 22, 2014 Male from JP , 85 years of age, was diagnosed with and was treated with Valtrex. Patient felt the following Valtrex side effects: encephalitis viral, toxic encephalopathy, renal failure, nervous system disorder, confusional state. Valtrex dosage: 500mg Per Day.
Multiple prescriptions taken:
  • Calonal (100mg Three Times Per Day)
  • Gentamicin Sulfate


Jaundice, Haemolysis, Hyperbilirubinaemia, Hepatic Enzyme Increased
on Dec 23, 2013 Male from CH , 54 years of age, was diagnosed with and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: jaundice, haemolysis, hyperbilirubinaemia, hepatic enzyme increased. Valtrex dosage: 500mg Twice Per Day.
Multiple concurrent drugs taken:
  • Busulfan (64mg Four Times Per Day)
  • Antithymocyte Immunoglobulin (1600mg Per Day)
  • Endoxan (4800mg Per Day)
  • Solu-medrol (80mg Per Day)
  • Amikin (1g Per Day)
  • Nopil Forte (1unit Three Times Per Week)
  • Cefepim (2g Three Times Per Day)
  • Diflucan (400mg Weekly)
Patient was hospitalized.

Altered State Of Consciousness, Depressed Level Of Consciousness, Convulsion, Loss Of Consciousness, Glossoptosis, Feeling Abnormal, Atonic Seizures, Disorientation, Somnolence
Patient was taking Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: altered state of consciousness, depressed level of consciousness, convulsion, loss of consciousness, glossoptosis, feeling abnormal, atonic seizures, disorientation, somnolence on Feb 04, 2014 from JP Additional patient health information: Female , 66 years of age, was diagnosed with and. Valtrex dosage: 1000mg Three Times Per Day. Patient was hospitalized.

Toxic Encephalopathy, Altered State Of Consciousness
Adverse event was reported on Feb 19, 2014 by a Female taking Valtrex (Dosage: 500mg Per Day) was diagnosed with and. Location: JP , 62 years of age, weighting 94.80 lb, Patient felt the following Valtrex side effects: toxic encephalopathy, altered state of consciousness.
Multiple prescriptions taken:
  • Feburic (20mg Per Day)
  • Furosemide (40mg Twice Per Day)
  • Fluitran (2mg Per Day)
  • Rocaltrol (.25mcg Per Day)
  • Kayexalate (5g Per Day)
  • Miya Bm (1iuax Three Times Per Day)
  • Takepron (15mg Per Day)
  • Sodium Bicarbonate (.5g Three Times Per Day)
Patient was hospitalized.

Confusional State, Nausea, Gait Disturbance, Vomiting
on Dec 31, 2013 Female from JP , 61 years of age, was diagnosed with and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: confusional state, nausea, gait disturbance, vomiting. Valtrex dosage: 500mg Per Day.
Multiple concurrent drugs taken: Patient was hospitalized.

Oesophageal Rupture, Pharyngeal Injury
on Dec 18, 2013 Female from JP , 81 years of age, was diagnosed with and was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: oesophageal rupture, pharyngeal injury. Valtrex dosage: 500mg Per Day. Patient was hospitalized.

Dyslalia, Dizziness, Nausea, Vomiting, Decreased Appetite, Psychiatric Symptom
Patient was taking Valtrex. Patient felt the following Valtrex side effects: dyslalia, dizziness, nausea, vomiting, decreased appetite, psychiatric symptom on Dec 12, 2013 from JP Additional patient health information: Female , 74 years of age, was diagnosed with and. Valtrex dosage: 500mg Twice Per Day.
Multiple prescriptions taken:
  • Calblock (16mg Per Day)
  • Regpara (50mg Per Day)
  • Omeprazole (10mg Per Day)
  • Cilostazol (100mg Twice Per Day)
  • Renagel (1000mg Three Times Per Day)
  • Allopurinol (100mg Per Day)
  • Fluvastatin (20mg Per Day)
  • Doxazosin Mesilate (2mg Per Day)


Renal Impairment, Altered State Of Consciousness
Adverse event was reported on Dec 17, 2013 by a Male taking Valtrex (Dosage: 1000mg Three Times Per Day) was diagnosed with and. Location: JP , 91 years of age, weighting 103.6 lb, After Valtrex was administered, patient encountered several Valtrex side effects: renal impairment, altered state of consciousness.
Multiple concurrent drugs taken:
  • Mevalotin (10mg Per Day)
  • Harnal (.2mg Per Day)
  • Gaster (20mg Per Day)
  • Norvasc (2.5mg Per Day)
  • Metgluco (500mg Twice Per Day)
Patient was hospitalized.

Loss Of Consciousness, Convulsion, Speech Disorder
on Dec 04, 2013 Female from JP , 81 years of age, was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: loss of consciousness, convulsion, speech disorder. Valtrex dosage: 1000mg Three Times Per Day.

Toxic Encephalopathy, Dyslalia, Dysarthria, Dyskinesia
on Dec 20, 2013 Female from JP , 90 years of age, was diagnosed with and was treated with Valtrex. Patient felt the following Valtrex side effects: toxic encephalopathy, dyslalia, dysarthria, dyskinesia. Valtrex dosage: 500mg Per Day.

Confusional State, Vertigo, Nausea, Dysaesthesia
Patient was taking Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: confusional state, vertigo, nausea, dysaesthesia on Nov 26, 2013 from CH Additional patient health information: Female , 53 years of age, was diagnosed with and. Valtrex dosage: 500mg Twice Per Day.
Multiple concurrent drugs taken:
  • Omeprazole (20mg Per Day)
  • Stilnox (10mg Per Day)
  • Temesta (.5ml Per Day)
  • Symbicort (2puff Per Day)


Investigation, Vomiting, Malnutrition, Oesophagitis, Ill-defined Disorder, Nausea
Adverse event was reported on Dec 10, 2013 by a Female taking Valtrex (Dosage: 1g Three Times Per Day) was diagnosed with and. Location: US , 33 years of age, Directly after, patient experienced the unwanted or unexpected Valtrex side effects: investigation, vomiting, malnutrition, oesophagitis, ill-defined disorder, nausea.
Associated medications used: Patient was hospitalized.

Encephalopathy, Overdose, Abnormal Behaviour, Anger
on Nov 22, 2013 Male from JP , 70 years of age, weighting 143.3 lb, was diagnosed with and was treated with Valtrex. Patient felt the following Valtrex side effects: encephalopathy, overdose, abnormal behaviour, anger. Valtrex dosage: 1000mg Three Times Per Day.
Multiple prescriptions taken:

Altered State Of Consciousness, Dyslalia, Vomiting, Overdose
on Nov 18, 2013 Female from JP , 79 years of age, was diagnosed with and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: altered state of consciousness, dyslalia, vomiting, overdose. Valtrex dosage: 1000mg Three Times Per Day.
Multiple concurrent drugs taken:
  • Bayaspirin
  • Plavix
  • Onealfa
  • Furosemide
  • Pronon
  • Fosrenol
  • Warfarin
Patient was hospitalized.

Renal Disorder
Patient was taking Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: renal disorder on Nov 18, 2013 from JP Additional patient health information: Female , 81 years of age, weighting 79.37 lb, was diagnosed with and. Valtrex dosage: 1000mg Three Times Per Day. Patient was hospitalized.

Pancytopenia
Adverse event was reported on Dec 20, 2013 by a Female taking Valtrex (Dosage: 3000mg Three Times Per Day) was diagnosed with and. Location: JP , 60 years of age, Patient felt the following Valtrex side effects: pancytopenia.
Multiple prescriptions taken:

Toxic Encephalopathy, Depressed Level Of Consciousness, Dysarthria, Dizziness, Abnormal Behaviour, Amnesia, Gait Disturbance, Drooling
on Dec 17, 2013 Male from JP , 66 years of age, was diagnosed with and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: toxic encephalopathy, depressed level of consciousness, dysarthria, dizziness, abnormal behaviour, amnesia, gait disturbance, drooling. Valtrex dosage: 250mg Per Day. Patient was hospitalized.

Toxic Encephalopathy, Headache, Abdominal Pain, Dysarthria
on Mar 12, 2014 Female from JP , 88 years of age, weighting 77.16 lb, was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: toxic encephalopathy, headache, abdominal pain, dysarthria. Valtrex dosage: 250mg Per Day.

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Most drugs have a large list of nonsevere or mild adverse effects which do not rule out continued usage. These effects depend on individual sensitivity, and can include nausea, dizziness, diarrhea, malaise, vomiting, headache, dermatitis, dry mouth, etc. Check commonly reported side effects . These can be considered a form of pseudo-allergic reaction, as not all users experience these effects; many users experience none at all.

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.

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