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Restoril Side Effects

Generic Name: temazepam

Medically reviewed by Last updated on April 23, 2020.

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

In Summary

More frequent side effects include: dizziness, insomnia, lethargy, and irritability. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to temazepam: 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.

Side effects requiring immediate medical attention

Along with its needed effects, temazepam (the active ingredient contained in Restoril) 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 temazepam:

Less common

  • False or unusual sense of well-being
  • fear or nervousness
  • mood or mental changes


  • Difficult or labored breathing
  • fast, irregular, pounding, or racing heartbeat or pulse
  • large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or genitals
  • loss of appetite
  • loss of memory
  • nightmares
  • problems with memory
  • seeing, hearing, or feeling things that are not there
  • shakiness and unsteady walk
  • tightness in the chest
  • uncontrolled eye movements
  • unsteadiness, trembling, or other problems with muscle control or coordination
  • unusual excitement, nervousness, restlessness, or irritability
  • weight loss

Incidence not known

  • Muscle cramps
  • seizures
  • shakiness in the legs, arms, hands, or feet
  • stomach cramps
  • sweating
  • trembling or shaking of the hands or feet
  • vomiting

Get emergency help immediately if any of the following symptoms of overdose occur while taking temazepam:

Symptoms of overdose

  • Blurred vision
  • change in consciousness
  • confusion
  • decreased or absent reflexes
  • difficult or troubled breathing
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • irregular, fast, slow, or shallow breathing
  • loss of consciousness
  • pale or blue lips, fingernails, or skin
  • sleepiness or unusual drowsiness
  • unusual tiredness or weakness

Side effects not requiring immediate medical attention

Some side effects of temazepam 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:

Less common

  • Diarrhea
  • dry mouth
  • feeling of constant movement of self or surroundings
  • headache
  • nausea
  • sensation of spinning
  • unusual dullness or feeling of sluggishness


For Healthcare Professionals

Applies to temazepam: oral capsule


The most commonly reported side effects included drowsiness, headache, and fatigue.[Ref]

Nervous system

Lightheadedness, slurred speech, and unsteadiness usually occur at the start of treatment and disappear with repeated doses.[Ref]

Common (1% to 10%): Dizziness, drowsiness, hangover, headache, lethargy, sedation, vertigo

Uncommon (0.1% to 1%): Ataxia, equilibrium loss, faintness, muzziness, sciatica, taste loss, tremor

Rare (0.01% to 0.1%): Dysarthria

Frequency not reported: Amnesia, anterograde amnesia, coma, convulsions, daytime drowsiness, epileptic seizures, extrapyramidal symptoms, extremity tingling, horizontal nystagmus, hypersensitivity to light/noise/physical contact, impaired concentration, lightheadedness, numbness, oversedation, perceptual disturbances, reduced alertness, seizures, slurred speech, unsteadiness[Ref]


Common (1% to 10%): Anxiety, confusion, depression, euphoria, nervousness, nightmares

Uncommon (0.1% to 1%): Decreased orgasm, disorientation, increased dreaming, irritability, libido changes, unmasking of depression, vivid dreams

Rare (0.01% to 0.1%): Restless sleep

Frequency not reported: Abuse, aggressiveness/aggression, agitation, broken sleep (with vivid dreams), confusional states, delusion, depersonalization, dependence, derealization, disinhibition, excitement, extreme anxiety, hallucinations, hostility, inappropriate behavior, insomnia, mood changes, numbed emotions, other adverse behavioral effects, overstimulation, physical dependence, psychological dependence, psychoses, psychotic manifestations, rage, rebound insomnia, restlessness, sexual arousal, sleep disturbance, stimulation, suicidal attempt, suicidal ideation, tension, withdrawal effects/symptoms[Ref]

Dependence and numbed emotions usually occur at the start of treatment and disappear with repeated doses.[Ref]


Common (1% to 10%): Abdominal discomfort, diarrhea, dry mouth, nausea

Uncommon (0.1% to 1%): Gastrointestinal upset, vomiting

Rare (0.01% to 0.1%): Salivation changes

Frequency not reported: Abdominal cramps, constipation, gastrointestinal disturbances[Ref]


Common (1% to 10%): Fatigue, weakness

Uncommon (0.1% to 1%): Asthenia

Frequency not reported: Falls, hyperacusis, hypothermia, paradoxical reactions, rebound phenomenon, tinnitus[Ref]


Common (1% to 10%): Blurred vision

Uncommon (0.1% to 1%): Burning eyes

Rare (0.01% to 0.1%): Visual disturbances

Frequency not reported: Diplopia/double vision, photophobia[Ref]

Double vision usually occurs at the start of treatment and disappears with repeated doses.[Ref]


Uncommon (0.1% to 1%): Allergic skin reactions, hyperhidrosis, macular rash, pruritus

Rare (0.01% to 0.1%): Skin reactions

Frequency not reported: Alopecia, sweating[Ref]


Uncommon (0.1% to 1%): Increased neutrophils, leukocytosis

Rare (0.01% to 0.1%): Blood disorders, blood dyscrasias

Frequency not reported: Agranulocytosis, pancytopenia, thrombocytopenia[Ref]


Uncommon (0.1% to 1%): Increased AST, increased bilirubin

Rare (0.01% to 0.1%): Abnormal liver function, jaundice

Frequency not reported: Increased liver enzymes[Ref]


Uncommon (0.1% to 1%): Impotence, proteinuria

Rare (0.01% to 0.1%): Incontinence, urinary retention[Ref]


Uncommon (0.1% to 1%): Palpitations, tachycardia

Rare (0.01% to 0.1%): Hypotension

Frequency not reported: Lowering in blood pressure, mild systolic hypertension, orthostatic hypotension[Ref]


Uncommon (0.1% to 1%): Backache, leg cramps

Rare (0.01% to 0.1%): Impaired muscular function

Frequency not reported: Muscle pain, muscle weakness[Ref]

Muscle weakness usually occurs at the start of treatment and disappears with repeated doses.[Ref]


Respiratory depression usually occurs at the start of treatment and disappears with repeated doses.[Ref]

Uncommon (0.1% to 1%): Breathlessness, dyspnea

Frequency not reported: Apnea, respiratory depression, worsening of obstructive pulmonary disease, worsening of sleep apnea[Ref]


Uncommon (0.1% to 1%): Anorexia, increased serum alkaline phosphatase

Frequency not reported: Hyponatremia, loss of appetite[Ref]


Uncommon (0.1% to 1%): Increased blood urea nitrogen[Ref]


Rare (0.01% to 0.1%): Fatal anaphylaxis

Frequency not reported: Hypersensitivity reactions, severe anaphylactic reaction, severe anaphylactoid reaction[Ref]


Frequency not reported: Syndrome of inappropriate antidiuretic hormone secretion (SIADH)[Ref]


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

2. "Product Information. Restoril (temazepam)." Sandoz Pharmaceuticals Corporation, East Hanover, NJ.

3. Cerner Multum, Inc. "Australian Product Information." O 0

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.