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Hypertension (4)
Neuropathy (3)
Blurred Vision (2)
Fatigue (2)
Also Some Panic (1)
Arrythmia (1)
Bleeding (1)
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Valtrex Side Effects and Adverse Effects reported to US Food and Drug Administration (FDA)

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Showing 1-25 of 3660 

Dizziness, Blood Creatinine Increased, Renal Failure Acute, Encephalopathy, Decreased Appetite, Dysarthria (8387785-7)
on May 17, 2012 Female from JAPAN , 60 years of age, was diagnosed with
  • herpes zoster
and was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: dizziness, blood creatinine increased, renal failure acute, encephalopathy, decreased appetite, dysarthria. Valtrex dosage: 3000mg Per Day.

White Blood Cell Count Decreased, Red Blood Cell Count Decreased (8383518-9)
Patient was taking Valtrex. Patient felt the following Valtrex side effects: white blood cell count decreased, red blood cell count decreased on Mar 21, 2011 from UNITED STATES Additional patient health information: Female , 77 years of age, . Valtrex dosage: N/A.
Multiple prescriptions taken:
  • Revlimid (15 Mg, 1 In 1 D, Po 15 Mg, 1 In 1 D, Po 10 Mg, X 21, Po)
  • Revlimid (15 Mg, 1 In 1 D, Po 15 Mg, 1 In 1 D, Po 10 Mg, X 21, Po)
  • Revlimid (15 Mg, 1 In 1 D, Po 15 Mg, 1 In 1 D, Po 10 Mg, X 21, Po)
  • Plavix
  • Neurontin


Herpes Zoster (8383480-9)
Adverse event was reported on Apr 04, 2011 by a Female taking Valtrex (Dosage: N/A) . Location: UNITED STATES , 54 years of age, After Valtrex was administered, patient encountered several Valtrex side effects: herpes zoster.
Multiple concurrent drugs taken:
  • Revlimid (5 Mg, 3 Weeks On/ 1 Week Off, Po 10 Mg, 1 In 1 D, Po 5 Mg, 3 Weeks On 1 Week Off, Po)
  • Revlimid (5 Mg, 3 Weeks On/ 1 Week Off, Po 10 Mg, 1 In 1 D, Po 5 Mg, 3 Weeks On 1 Week Off, Po)
  • Revlimid (5 Mg, 3 Weeks On/ 1 Week Off, Po 10 Mg, 1 In 1 D, Po 5 Mg, 3 Weeks On 1 Week Off, Po)
  • Revlimid (5 Mg, 3 Weeks On/ 1 Week Off, Po 10 Mg, 1 In 1 D, Po 5 Mg, 3 Weeks On 1 Week Off, Po)
  • Levothyroxine Sodium
Patient was hospitalized.

Neutropenia, Pneumonia Bacterial (8381954-8)
on Aug 03, 2011 Male from UNITED STATES , 74 years of age, was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: neutropenia, pneumonia bacterial. Valtrex dosage: N/A.
Associated medications used:
  • Dexamethasone
  • Omeprazole
  • Revlimid (10 Mg, Daily X21 Days Q 28 Days, Po ; 10 Mg, Daily X21 Days Q 28 Days, Po)
  • Revlimid (10 Mg, Daily X21 Days Q 28 Days, Po ; 10 Mg, Daily X21 Days Q 28 Days, Po)
  • Protonix
  • Aspirin
  • Lasix
  • Potassium Chloride
Patient was hospitalized.


Dizziness, Hemiplegia (8380486-0)
on Apr 19, 2012 Male from JAPAN , weighting 136.7 lb, was diagnosed with
  • herpes zoster
and was treated with Valtrex. Patient felt the following Valtrex side effects: dizziness, hemiplegia. Valtrex dosage: 3000mg Per Day.
Multiple prescriptions taken:
  • Zonisamide
  • Candesartan Cilexetil


Altered State Of Consciousness, Groin Pain, Joint Range Of Motion Decreased, Dyslalia, Dysarthria, Encephalopathy, Rash, Pleural Effusion, Convulsion (8377725-9)
Patient was taking Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: altered state of consciousness, groin pain, joint range of motion decreased, dyslalia, dysarthria, encephalopathy, rash, pleural effusion, convulsion on May 14, 2012 from JAPAN Additional patient health information: Female , 63 years of age, weighting 103.6 lb, was diagnosed with
  • encephalitis viral
and. Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Acyclovir
Patient was hospitalized.

Dysarthria, Neurological Symptom, Renal Impairment, Anuria, Asthenia (8365043-4)
Adverse event was reported on May 11, 2012 by a Male taking Valtrex (Dosage: 3000mg Per Day) was diagnosed with
  • herpes zoster
and. Location: JAPAN , 71 years of age, Directly after, patient experienced the unwanted or unexpected Valtrex side effects: dysarthria, neurological symptom, renal impairment, anuria, asthenia. Patient was hospitalized.

Anuria, Renal Failure Acute, Convulsion, Altered State Of Consciousness, Oliguria (8365029-X)
on Mar 16, 2012 Male from JAPAN , weighting 112.4 lb, was diagnosed with
  • herpes zoster
and was treated with Valtrex. Patient felt the following Valtrex side effects: anuria, renal failure acute, convulsion, altered state of consciousness, oliguria. Valtrex dosage: 3000mg Per Day.
Multiple prescriptions taken:
  • Arasena-a
  • Lyrica (300mg Per Day)


Pyrexia (8363483-0)
on Jun 13, 2011 Male from UNITED STATES , 56 years of age, was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: pyrexia. Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Tarka (udramil)
  • Claritin
  • Revlimid (10 Mg, X 21 Days, Po)
Patient was hospitalized.

Injury, Pain, Pulmonary Embolism, Emotional Distress, Anxiety (8359499-0)
Patient was taking Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: injury, pain, pulmonary embolism, emotional distress, anxiety on May 07, 2012 from UNITED STATES Additional patient health information: Female , 39 years of age, . Valtrex dosage: 500 Mg, Unk.
Associated medications used:
  • Ambien (Unk)
  • Yaz (Unk)


Neuropathy Peripheral, Hypertension (8357579-7)
Adverse event was reported on May 07, 2012 by a Female taking Valtrex (Dosage: N/A) was diagnosed with
  • leukaemia
  • hypothyroidism
and. Location: UNITED STATES , weighting 155.1 lb, Patient felt the following Valtrex side effects: neuropathy peripheral, hypertension.
Multiple prescriptions taken:
  • Levothyroxine Sodium
  • Platelets
  • Gengraf


Foetal Exposure During Pregnancy (8321840-2)
on Jun 02, 2011 Female from UNITED STATES , weighting 7.05 lb, was diagnosed with
  • herpes virus infection
and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: foetal exposure during pregnancy. Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Celebrex
  • Flonase
  • Relpax (40mg As Required)
  • Topamax
  • Tramadol Hcl (50mg As Required)
  • Chantix
  • Vitamin Tab
  • Vicodin


Feeling Abnormal, Hallucination (8320929-1)
on Apr 23, 2012 Male from UNITED STATES , weighting 181.0 lb, was diagnosed with
  • herpes zoster
  • pain
and was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: feeling abnormal, hallucination. Valtrex dosage: N/A.
Associated medications used:
  • Nucynta Er (Every 6 Hours As Needed)


Maternal Exposure During Pregnancy (8319954-6)
Patient was taking Valtrex. Patient felt the following Valtrex side effects: maternal exposure during pregnancy on Apr 16, 2012 from UNITED STATES Additional patient health information: Female , weighting 139.0 lb, was diagnosed with
  • herpes virus infection
  • dyspnoea
  • asthma
and. Valtrex dosage: 500 Mg, Qd.
Multiple prescriptions taken:
  • Proventil-hfa (2 Puff, Prn, Dose=2 Puff)
  • Advair Diskus 100/50 (Unk)
  • Omalizumab (Unk Mg, Q4w)
  • Multi-vitamins (Unk)


Malaise, Transplant (8317595-8)
Adverse event was reported on May 24, 2011 by a Female taking Valtrex (Dosage: N/A) . Location: UNITED STATES , 63 years of age, After Valtrex was administered, patient encountered several Valtrex side effects: malaise, transplant.
Multiple concurrent drugs taken:
  • Zofran


Musculoskeletal Pain, Aphthous Stomatitis, Dry Mouth, Oral Disorder, Dry Skin (8312930-9)
on May 03, 2011 Female from UNITED STATES , 48 years of age, weighting 134.9 lb, was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: musculoskeletal pain, aphthous stomatitis, dry mouth, oral disorder, dry skin. Valtrex dosage: N/A.
Associated medications used:
  • Ortho Tri-cyclen
  • Fioricet
  • Doxycycline
  • Gilenya (0.5 Mg, Qd, Oral)
  • Tramadol Hcl
  • Allegra (fexofenadine Hydrochloride, Pseudoephedrine Hydrochloride)
  • Flexeril
  • Zyrtec


Gaze Palsy, Disorientation, Decreased Appetite, Blood Urea Abnormal, Blood Creatinine Abnormal, Blood Potassium Abnormal, Somnolence, Atrioventricular Block Complete, Loss Of Consciousness (8311335-4)
on Apr 16, 2012 Female from JAPAN , weighting 79.37 lb, was diagnosed with
  • herpes zoster
  • diabetes mellitus
  • parkinson's disease
  • insomnia
and was treated with Valtrex. Patient felt the following Valtrex side effects: gaze palsy, disorientation, decreased appetite, blood urea abnormal, blood creatinine abnormal, blood potassium abnormal, somnolence, atrioventricular block complete, loss of consciousness. Valtrex dosage: 3000mg Per Day. Patient was hospitalized.

Emotional Distress, Abdominal Pain Upper, Influenza, Fatigue, Headache, Diarrhoea (8309166-4)
Patient was taking Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: emotional distress, abdominal pain upper, influenza, fatigue, headache, diarrhoea on Apr 12, 2012 from UNITED STATES Additional patient health information: Male , weighting 180.4 lb, . Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Clarinex-d
  • Gammagard Liquid (15-20 Grams)
  • Vitamin B-12
  • Cyanocobalamin
  • Celebrex
  • Levoxyl
  • Gammagard Liquid (15-20 Grams)
  • Gammagard Liquid (15-20 Grams)


Intestinal Obstruction, Prostate Cancer, Dysuria, Benign Prostatic Hyperplasia, Urinary Retention, Abdominal Discomfort, Micturition Frequency Decreased (8304568-4)
Adverse event was reported on Apr 13, 2012 by a Male taking Valtrex (Dosage: N/A) was diagnosed with
  • herpes zoster
and. Location: JAPAN , 60 years of age, Directly after, patient experienced the unwanted or unexpected Valtrex side effects: intestinal obstruction, prostate cancer, dysuria, benign prostatic hyperplasia, urinary retention, abdominal discomfort, micturition frequency decreased. Patient was hospitalized.

Diplopia, Flatulence, Dry Mouth, Oedema, Pyrexia, Weight Increased, Balance Disorder, Muscle Spasms, Hyperhidrosis (8297185-6)
on Apr 16, 2012 Female from UNITED STATES , weighting 154.3 lb, was diagnosed with
  • leukaemia
and was treated with Valtrex. Patient felt the following Valtrex side effects: diplopia, flatulence, dry mouth, oedema, pyrexia, weight increased, balance disorder, muscle spasms, hyperhidrosis. Valtrex dosage: 500 Mg, Daily.
Multiple prescriptions taken:
  • Lyrica (50 Mg, 2x/day)
  • Levothyroxine Sodium (50 Ug,daily)
  • Lyrica (50 Mg, 3x/day)


Vulvovaginal Dryness, Oral Herpes, Abdominal Pain (8278830-8)
on Nov 04, 2011 Female from UNITED STATES , weighting 147.0 lb, was diagnosed with
  • oral herpes
and was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: vulvovaginal dryness, oral herpes, abdominal pain. Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Nexium
  • Premarin


Progressive Multifocal Leukoencephalopathy, Nausea (8276073-5)
Patient was taking Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: progressive multifocal leukoencephalopathy, nausea on Mar 07, 2012 from UNITED STATES Additional patient health information: Female , 49 years of age, weighting 125.0 lb, . Valtrex dosage: N/A.
Associated medications used:
  • Cymbalta
  • Ampyra (10 Mg, Q 12 Hrs, Oral)
  • Ampyra (10 Mg, Q 12 Hrs, Oral)
  • Lamictal
  • Restoril /00054301/ (chlormezanone)
  • Tysabri
  • Bethanechol Cloride (bethanechol Chloride)
  • Provigil


Urinary Retention, Intestinal Obstruction, Benign Prostatic Hyperplasia, Micturition Frequency Decreased, Abdominal Discomfort, Prostate Cancer, Dysuria (8274665-0)
Adverse event was reported on Apr 04, 2012 by a Male taking Valtrex (Dosage: N/A) was diagnosed with
  • herpes zoster
and. Location: JAPAN , 60 years of age, Patient felt the following Valtrex side effects: urinary retention, intestinal obstruction, benign prostatic hyperplasia, micturition frequency decreased, abdominal discomfort, prostate cancer, dysuria. Patient was hospitalized.

Delirium (8274658-3)
on Mar 22, 2012 Female from JAPAN , 80 years of age, was treated with Valtrex. After Valtrex was administered, patient encountered several Valtrex side effects: delirium. Valtrex dosage: N/A.
Multiple concurrent drugs taken:
  • Amlodipine
  • Candesartan Cilexetil


Cerebrovascular Accident, Injury (8267074-1)
on Mar 30, 2012 Female from UNITED STATES , 18 years of age, was treated with Valtrex. Directly after, patient experienced the unwanted or unexpected Valtrex side effects: cerebrovascular accident, injury. Valtrex dosage: N/A.
Associated medications used:
  • Yasmin (Unk)
Patient was hospitalized.

Showing 1-25 of 3660 

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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.

Valtrex Information

Alternative VALTREX Names:VALACYCLO

Active Ingredient: VALACYCLO

Valtrex Dosage, Warnings, Usage.

Side Effects reported to FDA: 3660. View Valtrex Adverse Reports

Valtrex safety alerts: No

Reported deaths: 89

Reported hospitalizations: 1744

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