Guanfacine HCL ER Side Effects by Likelihood and Severity

COMMON side effects


If experienced, these tend to have a Less Severe expression

  • Difficulty Sleeping
  • Dizziness
  • Drowsiness
  • Dry Mouth
  • Inducing Of A Relaxed Easy State
  • Intense Abdominal Pain
  • Low Blood Pressure
  • Low Energy
  • Low Energy And Weakness
  • Nausea
  • Weight Gain

INFREQUENT side effects


If experienced, these tend to have a Less Severe expression

  • Altered Interest In Having Sexual Intercourse
  • An Increased Need To Urinate Often
  • Confusion
  • Constipation
  • Decreased Appetite
  • Generalized Weakness
  • Headache
  • Heart Throbbing Or Pounding
  • Indigestion
  • Involuntary Leakage Of Urine
  • Irritability
  • Itching
  • Nightmares
  • The Inability To Have An Erection
  • Vomiting

RARE side effects


If experienced, these tend to have a Severe expression

  • A Hypersensitivity Reaction To A Drug
  • A Type Of Brain Function Problem Called Encephalopathy
  • Abnormal Functioning Of The Sinus Node Of The Heart
  • Atrioventricular Block, A Type Of Slow Heart Rhythm Disorder
  • Chest Pain
  • Fast Heartbeat
  • Seizures
  • Skin Rash With Sloughing
  • Slow Heartbeat
  • Suicidal Behavior
  • Suicidal Thoughts

If experienced, these tend to have a Less Severe expression

  • A Feeling Of General Discomfort Called Malaise
  • A Feeling Of Pins And Needles On Skin
  • A Skin Rash
  • Accidental Falls
  • Anxious Feelings
  • Blurred Vision
  • Depression
  • Fainting
  • Hair Loss
  • Hallucinations
  • Joint Pain
  • Leg Cramps
  • Loss Of Skin Color
  • Muscle Pain
  • Muscle Tremors
  • Pink Eye
  • Raynaud's Phenomenon, A Condition Where Blood Vessels Constrict Too Much With Coldness Or Stress
  • Sensation Of Spinning Or Whirling
  • Skin Inflammation
  • Taste Impairment
  • Trouble Breathing
  • Visible Water Retention

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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.