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Flurazepam Side Effects

In Summary

Commonly reported side effects of flurazepam include: drowsiness. Other side effects include: dizziness, vertigo, insomnia, confusion, headache, and irritability. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to flurazepam: oral capsule

Along with its needed effects, flurazepam may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking flurazepam:

  • Black, tarry stools
  • blurred vision
  • chest pain
  • chills
  • confusion
  • cough
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • feeling like you will pass out
  • fever
  • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
  • painful or difficult urination
  • slurred speech
  • sore throat
  • sores, ulcers, or white spots on the lips or in the mouth
  • sweating
  • swollen glands
  • unusual bleeding or bruising
  • unusual tiredness or weakness
Incidence not known
  • Change in consciousness
  • clumsy movement, moving from side to side
  • confusion about identity, place, and time
  • falling
  • fast, irregular, pounding, or racing heartbeat or pulse
  • loss of consciousness
  • shakiness and unsteady walk
  • unsteadiness, trembling, or other problems with muscle control or coordination
  • unusual drowsiness, dullness, tiredness, weakness or feeling of sluggishness

Some side effects of flurazepam may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

  • Bitter taste
  • blurred vision
  • burning eyes
  • difficulty in focusing
  • discouragement
  • dry mouth
  • false or unusual sense of well-being
  • feeling of warmth
  • feeling sad or empty
  • hallucinations
  • increased watering of the mouth
  • itching skin or skin rash
  • loss of appetite
  • loss of interest or pleasure
  • mood or mental changes
  • nightmares
  • redness of the face, neck, arms and occasionally, upper chest
  • restlessness
  • sweating
  • trouble concentrating
  • trouble sleeping
  • unusual excitement, nervousness, restlessness, or irritability
  • weight loss
Incidence not known

For Healthcare Professionals

Applies to flurazepam: oral capsule

Nervous system

Common (1% to 10%): Reduced alertness, confusion, headache, dizziness, ataxia
Rare (less than 0.1%): Difficulty in focusing, faintness, slurred speech, confusion, restlessness, vertigo
Frequency not reported: CNS-depressant effects, next-day impairment, nervousness, talkativeness, drowsiness, staggering[Ref]


Common (1% to 10%): Numbed emotions
Rare (less than 0.1%): Euphoria, depression, hallucinations
Frequency not reported: Withdrawal syndrome, abnormal thinking, behavior changes, complex behaviors, worsening of depression, apprehension, irritability[Ref]


Common (1% to 10%): Fatigue
Frequency not reported: Weakness[Ref]


Rare (less than 0.1%): Dry mouth, bitter taste, excessive salivation
Frequency not reported: Heartburn, upset stomach, nausea, vomiting, diarrhea, constipation, gastrointestinal pain[Ref]


Rare (less than 0.1%): Elevated SGOT/SGPT, total and direct bilirubin elevations, elevated alkaline phosphatase
Frequency not reported: Jaundice[Ref]


Very rare (less than 0.01%): Severe anaphylactic/anaphylactoid reactions[Ref]


Frequency not reported: Palpitation, chest pain[Ref]


Rare (less than 0.1%): Sweating, pruritus, skin rash[Ref]


The most commonly reported side effects were headache, dizziness, muscle weakness, ataxia, and double vision.[Ref]


Frequency not reported: Genitourinary complaints, changes in libido, urinary retention[Ref]


Rare (less than 0.1%): Leukopenia, granulocytopenia
Frequency not reported: Blood dyscrasias[Ref]


Rare (less than 0.1%): Anorexia[Ref]


Common (1% to 10%): Muscle weakness
Frequency not reported: Body/joint pain[Ref]


Common (1% to 10%): Double vision
Rare (less than 0.1%): Blurred vision, burning eyes
Frequency not reported: Visual disturbance[Ref]


1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

2. "Product Information. Dalmane (flurazepam)." Roche Laboratories, Nutley, NJ.

Some side effects of flurazepam may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.