Gablofen Side Effects

Drowsiness, dizziness, weakness, headache, constipation, nausea, or vomiting may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: mental/mood changes (such as confusion, depression, hallucinations), numb/tingling skin, vision changes, difficulty urinating.

Get medical help right away if you have any very serious side effects, including: seizures, trouble breathing.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
  • anemia
  • leukocytosis
  • acute confusion
  • agitation
  • depression
  • diplopia
  • visual changes
  • nystagmus
  • tinnitus
  • hypertension
  • hypotension
  • pneumonia
  • xerostomia
  • constipation
  • erectile dysfunction
  • pruritus of skin
  • alopecia
  • urticaria
  • coma
  • drowsy
  • hallucinations
  • syncope
  • seizure disorder
  • dizziness
  • insomnia
  • fever
  • hyperhidrosis
  • pain
  • chills
  • tremor
  • gait abnormality
  • ataxia
  • hypotonia
  • edema
  • peripheral edema
  • anorexia
  • headache disorder
  • dysarthria
  • dysphasia
  • hyperventilation
  • apnea
  • dyspnea
  • nausea
  • vomiting
  • flatulence
  • diarrhea
  • urinary retention
  • urinary incontinence
  • increased urinary frequency
  • paresthesia
  • general weakness
  • acute abdominal pain
  • abrupt drug withdrawal causing life-threatening sequelae
  • symptoms of anxiety
  • injection site infection

Drug Interactions

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Tell your doctor or pharmacist if you are taking other products that cause drowsiness such as opioid pain or cough relievers (such as codeine, hydrocodone), alcohol, marijuana (cannabis), drugs for sleep or anxiety (such as alprazolam, lorazepam, zolpidem), other muscle relaxants (such as carisoprodol, cyclobenzaprine), or antihistamines (such as cetirizine, diphenhydramine).

Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.