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Dalmane Side Effects

Generic name: flurazepam

Medically reviewed by Last updated on Apr 9, 2023.

Note: This document contains side effect information about flurazepam. Some dosage forms listed on this page may not apply to the brand name Dalmane.

Applies to flurazepam: oral capsule.


Oral route (Capsule)

Concomitant use of benzodiazepines and opioids may result in profound sedation, respiratory depression, coma, and death. Reserve concomitant prescribing for patients with inadequate alternative treatment options. Limit dosages and durations to the minimum required and follow patients for signs and symptoms of respiratory depression and sedation.

Serious side effects of Dalmane

Along with its needed effects, flurazepam (the active ingredient contained in Dalmane) 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:


Incidence not known

Other side effects of Dalmane

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:


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. Product Information. Dalmane (flurazepam). Roche Laboratories. 2001;PROD.

2. Cerner Multum, Inc. UK Summary of Product Characteristics.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.