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Remimazolam Side Effects

Medically reviewed by Drugs.com. Last updated on Dec 30, 2023.

Applies to remimazolam: intravenous powder for solution.

Important warnings This medicine can cause some serious health issues

Intravenous route (powder for solution)

Warning: Personnel and Equipment for Monitoring and Resuscitation, and Risks from Concomitant Use with Opioid Analgesics and Other Sedative-Hypnotics. Only personnel trained in the administration of procedural sedation, and not involved in the conduct of the diagnostic or therapeutic procedure, should administer remimazolam.Administering personnel must be trained in the detection and management of airway obstruction, hypoventilation, and apnea, including the maintenance of a patent airway, supportive ventilation, and cardiovascular resuscitation.Remimazolam has been associated with hypoxia, bradycardia, and hypotension.

Continuously monitor vital signs during sedation and through the recovery period.Resuscitative drugs, and age-and size-appropriate equipment for bag/valve/mask assisted ventilation must be immediately available during administration of remimazolam.Concomitant use of benzodiazepines with opioid analgesics may result in profound sedation, respiratory depression, coma, and death.

The sedative effect of intravenous remimazolam can be accentuated by concomitantly administered CNS depressant medications, including other benzodiazepines and propofol.

Continuously monitor patients for respiratory depression and depth of sedation.

Serious side effects of remimazolam

Along with its needed effects, remimazolam 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 or nurse immediately if any of the following side effects occur while taking remimazolam:

More common side effects

  • blurred vision
  • chest pain or discomfort
  • confusion
  • dizziness, fainting, or lightheadedness when getting up suddenly from a lying or sitting position
  • drowsiness
  • fast, slow, pounding, or irregular heartbeat or pulse
  • headache
  • nausea
  • nervousness
  • pounding in the ears
  • sweating
  • trouble breathing
  • unusual tiredness or weakness
  • vomiting

Less common side effects

  • body aches or pain
  • chills
  • cough
  • ear congestion
  • fever
  • loss of voice
  • runny or stuffy nose
  • sneezing
  • sore throat

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

Symptoms of overdose

For healthcare professionals

Applies to remimazolam: intravenous powder for injection.

General adverse events

The most commonly reported side effects included hypotension, hypertension, respiratory depression, diastolic hypertension, systolic hypertension, hypoxia, diastolic hypotension, and bradycardia.[Ref]

Cardiovascular

In a colonoscopy study with cumulative fentanyl dose less than 100 mcg, 100 to 150 mcg, and over 150 mcg:

Hypotension was reported in 33%, 44%, and 100% of patients, respectively.

Hypertension was reported in 16%, 24%, and 0% of patients, respectively.

Bradycardia was reported in 8%, 14%, and 50% of patients, respectively.

Diastolic hypertension was reported in 6%, 14%, and 0% of patients, respectively.

Tachycardia was reported in 7%, 8%, and 50% of patients, respectively.

Diastolic hypotension was reported in 7%, 9%, and 0% of patients, respectively.

Systolic hypertension was reported in 3%, 8%, and 0% of patients, respectively.

In a bronchoscopy study with cumulative fentanyl dose less than 100 mcg, 100 to 150 mcg, and over 150 mcg:

Hypotension was reported in 24%, 51%, and 64% of patients, respectively.

Hypertension was reported in 20%, 40%, and 72% of patients, respectively.

Diastolic hypertension was reported in 30%, 19%, and 0% of patients, respectively.

Systolic hypertension was reported in 26%, 17%, and 4% of patients, respectively.

Diastolic hypotension was reported in 13%, 21%, and 0% of patients, respectively.

Bradycardia was reported in 1%, 6%, and 16% of patients, respectively.

Hypotension was reported as mild, moderate, and severe in 30.1%, 1.1%, and 0.1% of patients, respectively; diastolic hypotension was reported as mild in 8.7% of patients. Bradycardia was reported as mild, moderate, and severe in 6%, 0.1%, and 0.4% of patients, respectively.

In controlled trials in procedural sedation, patients 65 years and older had a higher frequency of events grouped under the term hypotension (47% vs 33.3%) than patients younger than 65 years; patients with American Society of Anesthesiologists Physical Status (ASA-PS) III to IV also showed a higher frequency for hypotension (43.6% vs 35.6%) than patients with ASA-PS I to II. Older age and higher ASA-PS were not associated with a higher frequency of bradycardia.

In a colonoscopy study, hypotension (58%), hypertension (42%), diastolic hypertension (10%), systolic hypertension (6%), bradycardia (3%), diastolic hypotension (3%), diastolic BP increased 3(%), BP increased (3%), and systolic BP increased (3%) were reported in patients with ASA-PS III and IV.[Ref]

In clinical studies, hypotension was defined as a decrease in systolic blood pressure (BP) to 80 mmHg or lower or in diastolic BP of 40 mmHg or lower, or a decrease in systolic or diastolic BP of at least 20% below baseline or requiring medical intervention; hypertension was defined as an increase in systolic BP to at least 180 mmHg or in diastolic BP to at least 100 mmHg, or an increase of systolic or diastolic BP of at least 20% over baseline or requiring medical intervention.

Respiratory

In a bronchoscopy study with cumulative fentanyl dose less than 100 mcg, 100 to 150 mcg, and over 150 mcg:

Hypoxia was reported in 16%, 35%, and 36% of patients, respectively.

Respiratory rate increased was reported in 10%, 19%, and 36% of patients, respectively.

Hypoxia was reported as mild, moderate, and severe in 8%, 0.9%, and 0.3% of patients, respectively. Respiratory rate decreased was reported as mild and moderate in 1.5% and 0.4% of patients, respectively.

In controlled trials in procedural sedation, patients 65 years and older had a higher frequency of events grouped under the term respiratory depression (22.8% vs 9%) than patients younger than 65 years; patients with ASA-PS III to IV also showed a higher frequency for respiratory depression (17.6% vs 11.8%) than patients with ASA-PS I to II.

In a colonoscopy study, respiratory acidosis, respiratory rate decreased, and upper respiratory tract infection were reported in 19%, 3%, and 3% of patients with ASA-PS III and IV, respectively.

Respiratory depression (hypoxia/oxygen saturation decreased) was reported in 2 of 8 subjects with moderate liver dysfunction, and 1 of 3 with severe liver dysfunction enrolled in a dedicated trial assessing this drug in liver dysfunction.[Ref]

Gastrointestinal

Other

Nervous system

References

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

2. (2020) "Product Information. Byfavo (remimazolam)." Acacia Pharma, Inc

Further information

Remimazolam side effects can vary depending on the individual. 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.