Effexor XR Side Effects by Likelihood and Severity

COMMON side effects

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If experienced, these tend to have a Severe expression

• Headache

If experienced, these tend to have a Less Severe expression

• A Change In Vision
• Altered Interest In Having Sexual Intercourse
• Anxious Feelings
• Blurred Vision
• Constipation
• Decreased Appetite
• Dizziness
• Drowsiness
• Dry Mouth
• Excessive Sweating
• Generalized Weakness
• Muscle Tremors
• Nausea
• Problems With Ejaculation
• Taste Impairment
• The Inability To Have An Erection
• Vomiting

INFREQUENT side effects

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If experienced, these tend to have a Severe expression

• A Feeling Of Restlessness With Inability To Sit Still
• Abnormal Sexual Function
• An Inability To Completely Empty The Bladder
• An Increased Need To Urinate Often
• Chest Pain
• Fast Heartbeat
• High Blood Pressure
• High Cholesterol
• Itching

If experienced, these tend to have a Less Severe expression

• A Migraine Headache
• A Skin Rash
• Abnormal Dreams
• Bronchitis
• Chills
• Confusion
• Diarrhea
• Feelings Of Hostility
• Gas
• Indigestion
• Inflammation Or Infection Of The Vagina
• Irritability
• Muscle Twitching
• Neck Pain
• Nervousness
• Orgasm Problems
• Ringing In The Ears
• Sensation Of Spinning Or Whirling
• Visible Water Retention
• Weight Gain
• Weight Loss

RARE side effects

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If experienced, these tend to have a Severe expression

• A Condition With Muscle Tissue Breakdown Called Rhabdomyolysis
• A Disorder With Excess Antidiuretic Hormone Called Syndrome Of Inappropriate Antidiuretic Hormone
• A Significant Type Of Allergic Reaction Called Anaphylaxis
• A Skin Disorder With Blistering And Peeling Skin Called Stevens-Johnson Syndrome
• A Skin Disorder With Blistering And Peeling Skin Called Toxic Epidermal Necrolysis
• A Type Of Allergic Reaction Called Angioedema
• A Type Of Inflammation Of The Lung Called Interstitial Pneumonitis
• Abnormal Muscle Movements
• Bleeding
• Bleeding Of The Stomach Or Intestines
• Blood Clot In A Deep Vein Of The Extremities
• Chronic Heart Failure
• Decreased Blood Platelets
• Difficult Or Painful Urination
• Disturbance In The Ability Of The Eye To Focus
• Erythema Multiforme, A Type Of Allergic Skin Reaction
• Extrapyramidal Disease, A Type Of Movement Disorder
• Fainting
• Fluid Retention In The Legs, Feet, Arms Or Hands
• Increased Pressure In The Eye
• Inflammation Of The Liver Called Hepatitis
• Low Amount Of Sodium In The Blood
• Low Blood Counts Due To Bone Marrow Failure
• Low Blood Pressure
• Low Blood Sugar
• Manic Behavior
• Mental Status Changes
• Mood Changes
• Neuroleptic Malignant Syndrome, A Reaction Characterized By Fever, Muscle Rigidity And Confusion
• Orthostatic Hypotension, A Form Of Low Blood Pressure
• Pancreatitis
• Pneumonia With High Amount Of Eosinophil White Blood Cells
• Secondary Angle-Closure Glaucoma, A Type Of Eye Disorder
• Seizures
• Serotonin Syndrome, A Type Of Disorder With High Serotonin Levels
• Suicidal Thoughts
• Takotsubo Cardiomyopathy
• Tardive Dyskinesia, A Disorder Characterized By Involuntary Movements Of The Face, Mouth And Tongue
• Torsades De Pointes, A Type Of Abnormal Heart Rhythm
• Trouble Breathing
• Ventricular Fibrillation, A Heart Rhythm Disorder
• Very Low Levels Of Granulocytes, A Type Of White Blood Cell

If experienced, these tend to have a Less Severe expression

• A Feeling Of Pins And Needles On Skin
• A Form Of Mania That Has A Lower Severity Of Symptoms
• A High Prolactin Level
• A Stuffy And Runny Nose
• Abnormal Liver Function Tests
• Abnormally Acute Hearing Or Painful Sensitivity To Sound
• Abnormally Long Or Heavy Periods
• Accidental Falls
• Aggressive Behavior
• Agitation
• An Abnormal Increase In Muscle Tone
• An Inability To Control Impulsive Behavior
• Bleeding Not Related To Menstrual Period
• Bruising Under The Skin
• Bulging Of The Eyes
• Burping
• Delirium
• Depersonalization, A Disconnection Of One's Own Sense Of Reality Or Identity
• Difficulty Sleeping
• Dilated Pupils
• Elevation Of Proteins In The Urine
• Flu-Like Symptoms
• Grinding Of The Teeth
• Hair Loss
• Heart Throbbing Or Pounding
• Hives
• Increased Sensitivity Of The Skin To The Sun
• Inflammation Of The Tissue Lining The Sinuses
• Intense Abdominal Pain
• Lockjaw
• Loss Of Muscle Coordination
• Muscle Stiffness
• Nosebleed
• Pain With Menstruation
• Poisoning Caused By Anticholinergic Medication
• Temporary Redness Of Face And Neck
• Widening Of Blood Vessels
• Yawning