Singulair Side Effects by Likelihood and Severity

COMMON side effects


If experienced, these tend to have a Severe expression

  • Abnormal Liver Function Tests
  • The Flu

If experienced, these tend to have a Less Severe expression

  • A Common Cold
  • Cough
  • Diarrhea
  • Ear Inflammation
  • Fever
  • Head Pain
  • Inflammation Of The Tissue Lining The Sinuses
  • Intense Abdominal Pain
  • Runny Nose
  • Throat Irritation

INFREQUENT side effects


If experienced, these tend to have a Severe expression

  • An Infection Of The Skin And The Tissue Below The Skin
  • Bronchitis
  • Infection And Inflammation Of The Stomach And Intestines
  • Nearsightedness

If experienced, these tend to have a Less Severe expression

  • A Bacterial Infection Of The Middle Ear
  • A Skin Rash
  • A Toothache
  • A Type Of Allergy That Causes Red And Itchy Skin Called Atopic Dermatitis
  • Dizziness
  • Generalized Weakness
  • Low Energy
  • Stuffy Nose

RARE side effects


If experienced, these tend to have a Severe expression

  • 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 Sleep Disorder Called Night Terrors
  • A Type Of Allergic Reaction Called Angioedema
  • Allergic Reaction Causing Inflammation Of Blood Vessels
  • An Allergic Reaction To A Drug
  • Chickenpox
  • Decreased Blood Platelets
  • Erythema Multiforme, A Type Of Allergic Skin Reaction
  • Erythema Nodosum, A Skin Condition With Red And Painful Nodules
  • Feelings Of Hostility
  • Hives
  • Increased Eosinophils In The Blood
  • Inflammation Of The Lining Of The Stomach And Intestines
  • Inflammation Of The Liver With Stoppage Of Bile Flow
  • Liver Damage
  • Nosebleed
  • Pancreatitis
  • Pink Eye
  • Pneumonia
  • Pneumonia With High Amount Of Eosinophil White Blood Cells
  • Pyuria, Or White Blood Cells In The Urine
  • Seizures
  • Suicidal Behavior
  • Suicidal Thoughts

If experienced, these tend to have a Less Severe expression

  • A Change In The Ability To Pay Attention
  • A Type Of Skin Condition With Redness And Itching Called Eczema
  • Abnormal Dreams
  • Aggressive Behavior
  • Agitation
  • An Infection Due To A Virus
  • Anxious Feelings
  • Bruising
  • Chronic Muscle Twitches Or Movements
  • Confusion
  • Cramps
  • Depression
  • Difficulty Sleeping
  • Drowsiness
  • Hallucinations
  • Heart Throbbing Or Pounding
  • Indigestion
  • Involuntary Leakage Of Urine
  • Irritability
  • Itching
  • Joint Pain
  • Laryngitis
  • Memory Loss
  • Muscle Pain
  • Muscle Tremors
  • Nausea
  • Nervousness
  • Nightmares
  • Numbness
  • Numbness And Tingling
  • Obsessive Compulsive Disorder
  • Sleepwalking
  • Stuttering
  • Visible Water Retention
  • Vomiting

Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.