sponsored
PatientsVille.com Logo

PatientsVille

Effexor Serotonin Syndrome Side Effects

Effexor Serotonin Syndrome Side Effect Reports


The following Effexor Serotonin Syndrome side effect reports were submitted by healthcare professionals and consumers.

This information will help you understand how side effects, such as Serotonin Syndrome, can occur, and what you can do about them.

A side effect could appear soon after you start Effexor or it might take time to develop.



Serotonin Syndrome, Mydriasis, Blood Electrolytes Decreased, Blood Glucose Increased

This Serotonin Syndrome side effect was reported by a consumer or non-health professional from US. A 28-year-old patient (weight:NA) experienced the following symptoms/conditions: depression. The patient was prescribed Effexor Xr (dosage: 75 Mg, 1x/day), which was started on NS. Concurrently used drugs: NA. When starting to take Effexor Xr the consumer reported the following symptoms:
  • Serotonin Syndrome
  • Mydriasis
  • Blood Electrolytes Decreased
  • Blood Glucose Increased
The patient was hospitalized. These side effects may potentially be related to Effexor Xr.
Serotonin Syndrome

This Serotonin Syndrome Effexor Xr side effect was reported by a pharmacist from US on Aug 02, 2013. A male , 39 years of age, was treated with Effexor Xr. The patient presented the following health conditions:
  • Serotonin Syndrome
. Effexor Xr dosage: 75 Mg, 1x/day. Additional drugs used at the same time:
  • Nucynta Er (100 Mg, 2x/day)
  • Zolpidem (10 Mg As Needed At Bedtime)
  • Ranitidine (150 Mg, 2x/day)
  • Morphine (45 Mg, 2x/day)
The patient was hospitalized.
Serotonin Syndrome, Depressed Level Of Consciousness, Vomiting, Myotonia, Weight Decreased

This is a Effexor Lp side effect report of a 70-year-old patient (weight:NA) from FR, suffering from the following symptoms/conditions: NA, who was treated with Effexor Lp (dosage:37.5 Mg, 1x/day, start time: 201305), combined with: NA., and developed a serious reaction and a Serotonin Syndrome side effect. The patient presented with:
  • Serotonin Syndrome
  • Depressed Level Of Consciousness
  • Vomiting
  • Myotonia
  • Weight Decreased
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Effexor Lp treatment in patients suffering from NA, resulting in Serotonin Syndrome.

Staphylococcal Infection, Serotonin Syndrome, Confusional State, Feeling Abnormal, Pain

A 54-year-old patient (weight: NA) from US with the following symptoms: depression,staphylococcal infection started Effexor treatment (dosage: 75 Mg, 2x/day) on Mar 05, 2013. Soon after starting Effexor treatment, the consumer experienced several side effects, including:
  • Staphylococcal Infection
  • Serotonin Syndrome
  • Confusional State
  • Feeling Abnormal
  • Pain
. Concurrently used drugs:
  • Zyvox (600 Mg, 2x/day)
  • Reglan (Unk)
  • Prevacid (Unk)
  • Baclofen (Unk)
  • Lopressor (Unk)
  • Synthroid (Unk)
  • Azithromycin (Unk)
  • Fentanyl (Unk)
This finding indicates that some patients can be more vulnerable to developing Effexor side effects, such as Serotonin Syndrome.
Dizziness, Chest Discomfort, Agitation, Serotonin Syndrome, Abnormal Behaviour

A female patient from US was prescribed and started Effexor Xr on Jan 17, 2013. Patient felt the following Effexor side effects: dizziness, chest discomfort, agitation, serotonin syndrome, abnormal behaviour Additional patient health information: Female , 18 years of age, weighting 141.1 lb, The consumer reported the following symptoms: . Effexor Xr dosage: NA. Concurrently used drugs:
  • Adderall Xr
Serotonin Syndrome, Restless Legs Syndrome

This report suggests a potential Effexor Xr Serotonin Syndrome side effect(s) that can have serious consequences. A 39-year-old female patient from US (weight:NA) was diagnosed with the following health condition(s): depression and used Effexor Xr (dosage: 300 Mg Daily Po) starting Sep 01, 2012. Soon after starting Effexor Xr the patient began experiencing various side effects, including:
  • Serotonin Syndrome
  • Restless Legs Syndrome
Drugs used concurrently:
  • Cymbalta 30 Mg Lilly (30 Mg Daily Po)
  • Levothyroxine
  • Clonazepam
  • Zolpidem
  • Estrogen
  • Gabapentin
Although Effexor Xr demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Serotonin Syndrome, may still occur.
Intentional Overdose, Toxicity To Various Agents, Cardiogenic Shock, Serotonin Syndrome, Status Epilepticus

An adverse event was reported by a health professional on Feb 18, 2014 by a Female taking Effexor Lp (dosage: 4500 Mg, Unk) . Location: FR , 27 years of age, patient began experiencing various side effects, including: Directly after treatment started, patient experienced the unwanted or unexpected Effexor side effects: intentional overdose, toxicity to various agents, cardiogenic shock, serotonin syndrome, status epilepticus. Additional medications/treatments:
Associated medications used:
  • Prozac (1280 Mg, Unk)
The patient was hospitalized.
Serotonin Syndrome

This Serotonin Syndrome problem was reported by a health professional from BELGIUM. A 76-year-old female patient (weight: NA) was diagnosed with the following medical condition(s): depression,tuberculosis.On NS a consumer started treatment with Effexor (dosage: 150 Mg, Unk). The following drugs/medications were being taken at the same time:
  • Isoniazid (300 Mg Per Day)
When commencing Effexor, the patient experienced the following unwanted symptoms /side effects:
  • Serotonin Syndrome
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Serotonin Syndrome, may become evident only after a product is in use by the general population.
Serotonin Syndrome

This is a Effexor side effect report of a 76-year-old female patient (weight: NA) from BELGIUM. The patient developed the following symptoms/conditions: depression,tuberculosis and was treated with Effexor (dosage: 150 Mg, Unk) starting NS. Concurrently used drugs:
  • Isoniazid (300 Mg Per Day)
Soon after that, the consumer experienced the following of symptoms:
  • Serotonin Syndrome
This opens a possibility that Effexor could cause Serotonin Syndrome and that some female patients may be more susceptible.
Toxicity To Various Agents, Serotonin Syndrome, Cardiogenic Shock, Status Epilepticus, Intentional Overdose

This Serotonin Syndrome side effect was reported by a health professional from FRANCE on Nov 01, 2011. A female patient from FRANCE , 27 years of age, was treated with Effexor. Directly after treatment started, patient experienced the unwanted or unexpected Effexor side effects: toxicity to various agents, serotonin syndrome, cardiogenic shock, status epilepticus, intentional overdose. Effexor dosage: 4500 Mg, Unk.
Associated medications used:
  • Prozac (1280 Mg, Unk)
The patient was hospitalized. These side effects may potentially be related to Effexor.
Serotonin Syndrome, Convulsion

This Serotonin Syndrome side effect was reported by a consumer or non-health professional from UNITED STATES. A patient (weight:NA) experienced the following symptoms/conditions: bipolar disorder,depression. The patient was prescribed Effexor Xr (dosage: Unk), which was started on Jan 01, 2000. Concurrently used drugs: NA. When starting to take Effexor Xr the consumer reported the following symptoms:
  • Serotonin Syndrome
  • Convulsion
These side effects may potentially be related to Effexor Xr.
Convulsion, Serotonin Syndrome

This Serotonin Syndrome Effexor Xr side effect was reported by a consumer or non-health professional from UNITED STATES on Jul 29, 2011. A male , weighting 105.0 lb, was diagnosed with and was treated with Effexor Xr. The patient presented the following health conditions:
  • Convulsion
  • Serotonin Syndrome
. Effexor Xr dosage: Unk. Additional drugs used at the same time: NA.
Weight Increased, Mania, Serotonin Syndrome

This is a Effexor side effect report of a 51-year-old female patient (weight:NA) from UNITED STATES, suffering from the following symptoms/conditions: obsessive-compulsive disorder,muscle tightness,bipolar disorder,depression,mania, who was treated with Effexor (dosage:Tabs,75mg Daily, start time: Jun 03, 2011), combined with:
  • Klonopin (Tab)
, and developed a serious reaction and a Serotonin Syndrome side effect. The patient presented with:
  • Weight Increased
  • Mania
  • Serotonin Syndrome
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Effexor treatment in female patients suffering from obsessive-compulsive disorder,muscle tightness,bipolar disorder,depression,mania, resulting in Serotonin Syndrome.
Anxiety, Agitation, Flushing, Mydriasis, Headache, Serotonin Syndrome, Tachycardia, Hypertension

A 23-year-old female patient (weight: NA) from UNITED STATES with the following symptoms: depression,post-traumatic stress disorder started Effexor Xr treatment (dosage: 225mg Daily Oral) on Mar 01, 2011. Soon after starting Effexor Xr treatment, the consumer experienced several side effects, including:
  • Anxiety
  • Agitation
  • Flushing
  • Mydriasis
  • Headache
  • Serotonin Syndrome
  • Tachycardia
  • Hypertension
. Concurrently used drugs: NA.The patient was hospitalized. This finding indicates that some patients can be more vulnerable to developing Effexor Xr side effects, such as Serotonin Syndrome.
Insomnia, Palpitations, Paraesthesia, Hallucination, Auditory, Serotonin Syndrome, Muscle Spasms, Mood Altered, Agitation

A patient from UNITED STATES was prescribed and started Effexor Xr on Mar 08, 2011. After Effexor was administered, patient encountered several Effexor side effects: insomnia, palpitations, paraesthesia, hallucination, auditory, serotonin syndrome, muscle spasms, mood altered, agitation Additional patient health information: male , weighting 150.0 lb, The consumer reported the following symptoms: was diagnosed with and. Effexor Xr dosage: 150 Mg Cap 1 Daily Po. Concurrently used drugs: NA.
Blood Creatine Phosphokinase Increased, Serotonin Syndrome, Convulsion

This report suggests a potential Effexor Serotonin Syndrome side effect(s) that can have serious consequences. A 60-year-old patient from NORWAY (weight:NA) was diagnosed with the following health condition(s): major depression and used Effexor (dosage: 75 Mg, Qd;) starting Feb 19, 2009. Soon after starting Effexor the patient began experiencing various side effects, including:
  • Blood Creatine Phosphokinase Increased
  • Serotonin Syndrome
  • Convulsion
Drugs used concurrently:
  • Imovane
  • Ciprofloxacin (500 Mg, Bid;)
  • Duphalac
  • Vival
  • Remeron (30 Mg Qd;)
  • Zyprexa (5 Mg, Qd;)
  • Selexid (pivmecillinam)
The patient was hospitalized. Although Effexor demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Serotonin Syndrome, may still occur.
Serotonin Syndrome

An adverse event was reported by a health professional on Dec 15, 2010 by a male taking Effexor (dosage: 225 Mg, 1x/day) . Location: CANADA , 59 years of age, patient began experiencing various side effects, including: Patient felt the following Effexor side effects: serotonin syndrome. Additional medications/treatments: The patient was hospitalized.
Anxiety, Serotonin Syndrome

This Serotonin Syndrome problem was reported by a consumer or non-health professional from UNITED STATES. A 18-year-old patient (weight: NA) was diagnosed with the following medical condition(s): depression.On Mar 01, 2010 a consumer started treatment with Effexor Xr (dosage: NA). The following drugs/medications were being taken at the same time:
  • Citalopram (40 Mg, 1x/day)
  • Minocycline
When commencing Effexor Xr, the patient experienced the following unwanted symptoms /side effects:
  • Anxiety
  • Serotonin Syndrome
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Serotonin Syndrome, may become evident only after a product is in use by the general population.
Aggression, Hallucination, Mental Status Changes, Myoclonus, Serotonin Syndrome, Tachycardia, Vomiting

This is a Effexor side effect report of a 59-year-old patient (weight: NA) from UNITED KINGDOM. The patient developed the following symptoms/conditions: NA and was treated with Effexor (dosage: NA) starting NS. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Aggression
  • Hallucination
  • Mental Status Changes
  • Myoclonus
  • Serotonin Syndrome
  • Tachycardia
  • Vomiting
The patient was hospitalized. This opens a possibility that Effexor could cause Serotonin Syndrome and that some patients may be more susceptible.
Discomfort, Headache, Nausea, Serotonin Syndrome, Sleep Disorder, Vomiting

This Serotonin Syndrome side effect was reported by a health professional from SWITZERLAND on Jul 29, 2010. A female patient from SWITZERLAND , 40 years of age, was diagnosed with and was treated with Effexor Xr. Patient felt the following Effexor side effects: discomfort, headache, nausea, serotonin syndrome, sleep disorder, vomiting. Effexor Xr dosage: 150 Mg Twice Daily,then Reduced To 75 Mg Daily And Then Stopped.
Multiple prescriptions taken:
  • Co-dafalgan
  • Xanax
  • Aurorix
  • Haldol
These side effects may potentially be related to Effexor Xr.
1 of 5 

DISCLAIMER: ALL DATA PROVIDED AS-IS, refer to terms of use for additional information.

Effexor Serotonin Syndrome Causes and Reviews


Antidepressants are medicines that treat depression. Your doctor can prescribe them for you. They work to balance some of the natural chemicals in our brains. It may take several weeks for them to help. There are several types of antidepressants. You and your doctor may have to try a few before finding what works best for you.

Antidepressants may cause mild side effects that usually do not last long. These may include headache, nausea, sleep problems, restlessness, and sexual problems. Tell your doctor if you have any side effects. You should also let your doctor know if you take any other medicines, vitamins, or herbal supplements.

It is important to keep taking your medicines, even if you feel better. Do not stop taking your medicines without talking to your doctor. You often need to stop antidepressants gradually.

NIH: National Institute of Mental Health


Effexor Serotonin Syndrome Reviews

Sun, 06 May 2012

I'm experiencing severe dizyness almost do face plants to the ground a dozen times a day. Can't focus  when tryin to read.
Always confused and forgetfull .
about to loose my job if this shit continues.

Tue, 02 Oct 2012

all of the above plus hives massive weight gain....An evil drug...should be taken off the market!!

Mon, 02 May 2011

Thank you everyone. I am definitely going to tell my shrink that I need to get off Effexor
immediately. Does anyone out there also take lithium and temazapam(sleeping pill)?

Thu, 07 Jun 2012

Does anyone else feel that Effexor XR doesn't work as well when they are either having a bout of influenza or herpes, or another viral infection?  I get brain zaps even on my normal dosage (150mg/day) if I am experiencing a cold or herpes outbreak.

Wed, 04 Nov 2009
tendon tears Effexor?
Tue, 12 May 2009
Effexor raised my blood presure alot ,I had extreme painful headaches,rash that started on my face which was horrible,then spread to my chest,my neck was beat red I itched so badly.I think docotrs need to be more educated on this med before giveing it out so quickly.
Sun, 17 May 2009
Effexor was horrible for me...as soon as I started it I started having panic attacks worse than ever (supposed to help them) scary bad dreams, waking up in a sweat and not knowing who I was, then depression. The first day I expeirenced the panic attacks fast heartrate, I called my Dr. and he assured me that it could not have taken effect that fast, not true! He told me to keep takin the medicine, I trusted his word until I ended up in the hospital feeling like I was loosing my mind. I ended up going into a very deep depression. This was many years ago but I read some of the post and thought I would share my experience. If your told that there is no way that you could be feeling any interactions on the first day, use your own judgement, I trusted my Dr's word and I almost died.
Sat, 11 Jun 2011
I Lost my children because of this drug, i almost took my own life and a life of someone very close to me, I also have liver damage, who do these people think they are making these and giving them to people?
Wed, 02 Dec 2009
Effexor amp; Pristiq is poison - I would know, I started taking it at 16 yrs old, instead of counselling I was given Effexor by a 'psychiatrist drug dealer' I was never offered counselling. I spent of $25,000 on this medication in my lifetime. Discontinuation Syndrome has been my worst nightmare. The brain zaps are disgusting. I wish I could get all of the people who hate venlafaxine together to sue these pharmaceutical companies. They have earnt billions of dollars off the suffering of us and we are the only ones who pay.
DISCLAIMER: ALL DATA PROVIDED AS-IS, refer to terms of use for additional information.

Common Drugs

Abilify (10132)
Adderall (1304)
Amlodipine (6664)
Amoxicillin (4387)
Benadryl (1568)
Celebrex (12876 )
Celexa (1342)
Cialis (2975)
Cipro (8580)
Citalopram (7792)
Crestor (18839)
Cymbalta (14373)
Doxycycline (1757)
Effexor (7289)
Flexeril (435)
Flomax (2177)
Fluoxetine (4261)
Gabapentin (4593)
Hydrocodone (2469)
Ibuprofen (8222)
Lantus (10968)
Lexapro (3499)
Lipitor (17769)
Lisinopril (8919)
Lyrica (27148)
Medrol (650)
Mirena (41254)
Mobic (957)
Morphine (5356)
Naproxen (538)
Neurontin (6501)
Oxycodone (4438)
Pradaxa (13372)
Prednisone (5926)
Prilosec (2631)
Prozac (1954)
Seroquel (27216)
Simvastatin (8348)
Synthroid (4452)
Tamiflu (5585)
Topamax (3748)
Tramadol (5054)
Trazodone (1458)
Viagra (5394)
Vicodin (1153)
Wellbutrin (6324)
Xanax (2847)
Zocor (5718)
Zoloft(6792)
Zyrtec(1669)

Top Effexor Side Effects

Dizziness (702)
Anxiety (595)
Nausea (594)
Depression (503)
Headache (495)
Feeling Abnormal (492)
Suicidal Ideation (449)
Condition Aggravated (436)
Paraesthesia (372)
Malaise (353)
Insomnia (349)
Fatigue (286)
Crying (285)
Confusional State (269)
Agitation (265)
Hyperhidrosis (263)
Asthenia (249)
Diarrhoea (236)
Tremor (236)
Convulsion (235)
Completed Suicide (222)
Hypertension (221)
Fall (219)
Disturbance In Attention (207)
Vomiting (204)
Aggression (201)
Blood Pressure Increased (194)
Anger (193)
Withdrawal Syndrome (183)
Somnolence (180)
Pain (177)
Suicide Attempt (175)
Weight Increased (163)
Abnormal Behaviour (151)
Dyspnoea (150)
Amnesia (150)
Intentional Overdose (136)
Irritability (135)
Abnormal Dreams (123)
Tinnitus (118)
Activities Of Daily Living Impaired (117)
Serotonin Syndrome (115)
Panic Attack (111)
Loss Of Consciousness (111)
Arthralgia (110)
Nightmare (109)
Disorientation (108)
Off Label Use (106)
Overdose (106)
Emotional Disorder (105)

➢ More

Effexor Common Side Effects

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

Examples: headache, dizziness

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

Dizziness (702)
Anxiety (595)
Nausea (594)
Depression (503)
Headache (495)
Feeling Abnormal (492)
Suicidal Ideation (449)
Condition Aggravated (436)
Paraesthesia (372)
Malaise (353)
Insomnia (349)
Fatigue (286)
Crying (285)
Confusional State (269)
Agitation (265)
Hyperhidrosis (263)
Asthenia (249)
Diarrhoea (236)
Tremor (236)
Convulsion (235)

➢ More


Don't miss out on new findings! Check the latest Clinical Research and Recruiting Clinical Trials for Your Health Condition

Check out clinical research studies for common conditions: Fatigue, Dizziness, Orajel, Viagra, Diarrhea , ASSEMBLY FLOW POD, Sinex, Osteopetrosis, 3.2X45 DRILL BIT, Antadys, COIL, IMAGING, MRI, Victan, Benzoin, Omnicef, Cholelithotomy, Lenaldiomide, Zopenex, Lenaldiomide, Oxygen, Thrombosis, Banana, Coolmetec, Glicamin, Patella, Onycholysis, Cervicitis, Onycholysis, Ticlid, 40MM METAL ON METAL ACETABULAR COMPONENT, Automatic Pressure Infusor Mallinckrodt, Claratin, Crestor, Purinethol, Water, BIPOLAR R HIP PROSTHESIS, Levopar, Fyr, Flomax, Allogeneic, Ladose, FAST CATH TRANSSEPTAL, Kaleorid, Adderall, Ultraviolet, Patella

Discuss Effexor Side Effects

Notice - The material on this site is for informational purposes only, and is not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Viewing and using of this information is subject to accepting Terms Of Use. PatientsVille.com does not provide medical advice, diagnosis or treatment. The information regarding adverse reports, reviews and polls contained on PatientsVille.com site has not been scientifically or otherwise verified as to a cause and effect relationship and cannot be used to estimate the incidence of side effects, adverse drug reactions or for establishing or changing of patient treatments. Thank you for visiting Patientsville.com!