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Midazolam Side Effects

Not all side effects for midazolam may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to midazolam: oral solution, oral syrup, oral tablet

Other dosage forms:

In addition to its needed effects, some unwanted effects may be caused by midazolam. In the event that any of these side effects do occur, they may require medical attention.

If any of the following side effects occur while taking midazolam, check with your doctor or nurse immediately:

Less common
  • Anxiety
  • chest pain or discomfort
  • choking
  • confusion
  • difficult or troubled breathing
  • drowsiness
  • dry mouth
  • fast heartbeat
  • hyperventilation
  • irregular heartbeats
  • irregular, fast or slow, or shallow breathing
  • irritability
  • lightheadedness, dizziness, or fainting
  • nausea
  • nervousness
  • noisy breathing
  • pale or blue lips, fingernails, or skin
  • restlessness
  • shaking
  • shortness of breath
  • slow or irregular heartbeat
  • tightness in the chest
  • trouble sleeping
  • unable to speak
  • unusual tiredness
  • weakness
  • wheezing
  • Attack, assault, or force
  • changes in patterns and rhythms of speech
  • feeling of constant movement of self or surroundings
  • headache
  • lack or loss of self-control
  • loss of balance
  • mood swings
  • noisy breathing
  • not breathing
  • restlessness
  • seeing, hearing, or feeling things that are not there
  • sensation of spinning
  • shakiness and unsteady walk
  • sleepiness
  • slow to respond
  • slurred speech
  • trouble in speaking
  • unconsciousness
  • unsteadiness, trembling, or other problems with muscle control or coordination

If any of the following symptoms of overdose occur while taking midazolam, get emergency help immediately:

Symptoms of overdose
  • Change in consciousness
  • difficulty with coordination
  • loss of consciousness
  • sleepiness or unusual drowsiness

Some of the side effects that can occur with midazolam may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common
  • Vomiting
Less common
  • Rash
  • Blurred vision
  • double vision
  • gagging
  • hiccups
  • seeing double
  • watering of mouth and drooling

For Healthcare Professionals

Applies to midazolam: compounding powder, injectable solution, intravenous solution, oral syrup


Respiratory side effects, which have included cardiorespiratory depression, apnea, and respiratory arrest, are extensions of the drugs pharmacologic activity.

Personnel and equipment necessary for the treatment of respiratory depression and arrest should be immediately available whenever midazolam is administered.

One retrospective study has reported that the frequency of respiratory arrest (in nonventilated patients) is 0.099%. This study reported that respiratory arrest was associated with high doses of midazolam, concurrent administration of opioids, and advanced age.

Another study has reported that midazolam causes a decrease in tidal volume, an increase in breathing frequency and no change in minute ventilation in healthy volunteers. That study, however, did report a significant increase in CO2 retention following midazolam administration.


Cardiovascular side effects including alterations in blood pressure, arrhythmias, and ventricular irritability have been reported. Hypotension and decreases in systemic vascular resistance have been reported most frequently; however many investigators have reported minimal cardiovascular effects following administration of midazolam.


Local side effects at the site of injection (local flare reactions, pain, burning, phlebitis, local irritation and swelling) have been reported in up to 12% of patients. Vascular impairment after inadvertent intra-arterial injection is a theoretic concern.

Although local effects have been reported frequently, many clinicians believe that midazolam is the least likely of the commonly available injectable benzodiazepines to result in local reactions.


Gastrointestinal side effects including nausea, vomiting, and hiccups have each been reported in about 3% of treated patients.

Nervous system

Nervous system side effects have included acute dystonia. One study (n=113) has reported that orally administered midazolam produced significant anterograde amnesia when administered as early as ten minutes before a surgical procedure.


Psychiatric side effects have included a variety of adverse behavioral effects such as disinhibition (especially sexual disinhibition), hostility, rage reactions, restlessness, aggressiveness, and paroxysmal excitement.


Other side effects including cases of benzodiazepine withdrawal symptoms (myalgias, tachycardia, and anxiety) have been reported in patients who have received multiple or continuous doses of midazolam. In such patients, abrupt discontinuation is not recommended.


Immunologic side effects including pruritus, angioedema, and bronchoconstriction have been reported rarely.


Endocrine side effects have included decreases in the secretion of cortisol and insulin.

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