Intranasal midazolam for acute seizure therapy
Table of contents:
Breakthrough seizures are all too commonplace in patients with epilepsy. Some of these seizures will prove to be prolonged. There are an estimated 150,000 cases of status epilepticus every year in the US. Caretakers, prehospital and hospital providers are frequently faced with management of prolonged seizure activity. As morbidity and mortality are at least partially dependent on the duration of seizure activity it is crucial that seizures be stopped as soon as possible. Transmucosal delivery of benzodiazepines (midazolam or lorazepam) provides a very effective, safe and inexpensive means to rapidly achieve seizure control.
Seizures are to a certain degree self-sustaining. Because global central nervous system activity is a balance of excitatory and inhibitory neurotransmission factors that shift the balance toward excitation can lead to prolonged seizure activity. Many clinicians have noted through their practice experience that seizures seem to be self-reinforcing. A molecular explanation for this phenomenon is beginning to develop. Mounting evidence suggests that post-synaptic GABAA receptors are internalized during status epilepticus thereby reducing neuro-inhibition at the synapse. The principle first-line agents for the treatment of status epilepticus are the benzodiazepines, which are GABA agonists. Therefore the longer a seizure persists the less effective this class of medicines may be suggesting that the earlier benzodiazepines are delivered the better.
Transmucosal delivery of generic benzodiazepines via the nasal mucosa offers an attractive and cost-effective alternative in the out-of-hospital setting. Midazolam and lorazepam easily cross the nasal mucosa and the blood brain barrier, resulting in a rapid rise in both the plasma and the cerebrospinal fluid concentrations.[3-6, 27]
Wermeling et al. (2006) Pharmacokinetics and pharmacodynamics of a new intranasal midazolam formulation (25 mg/ml concentration) in healthy volunteers.
Three randomized controlled trials and 1 prehospital observational trial exist, comparing rectal diazepam to either buccal (oral transmucosal) or intranasal midazolam.[7-10] Scott et al conducted a randomized controlled trial comparing buccal midazolam to rectal diazepam in epileptic students in an extended care school. A school nurse administered medication to all students who suffered continuous seizures for more than a 5-minutes. Patients with persistent seizures for an additional 10 minutes were treated at the on-call physician’s discretion. Oral transmucosal midazolam was effective in 75% of cases (30 of 40 seizures), whereas rectal diazepam was effective in 59% (23/39) ( P = non significant). There were no adverse cardiorespiratory effects in either group. Although these differences did not achieve statistical significance, the trend toward a better outcome along with the more socially acceptable delivery of oral transmucosal medication led the school to change its preferred treatment to the oral transmucosal route.
Camfield et al found similar efficacy in their randomized trail comparing these 2 routes and drew identical conclusions—oral transmucosal midazolam was preferred over rectal diazepam because of ease of use and social acceptability. The third randomized controlled trial, conducted by Fisgin et al, compared intranasal (rather than buccal) transmucosal midazolam to rectal diazepam. In this study, midazolam aborted 20 (87%) of 23 seizures and rectal diazepam 13 (60%) of 22 seizures (P b .05). These results were statistically significant in favor of the intranasal 130 route when compared with the rectal route. Again, as in previous studies, no clinically important adverse events were identified in the 2 groups.
The final study, by Holsti et al, was conducted in a prehospital ambulance setting. In this study, the entire emergency medical system converted from rectal diazepam to intranasal midazolam for treatment of pediatric seizures. The authors compared effectiveness and complication data before and after the change. The rates of prehospital seizure control (100% vs. 78%), need for need for emergent intubation (0% vs. 33%), and need for hospital admission (40% vs. 89%) were all substantially less in the intranasal midazolam group compared with the rectal diazepam group. The mean seizure duration was 11 minutes for those treated with nasal midazolam compared to 30 minutes for rectal diazepam. Children given the rectal medication were significantly more likely to have another seizure in the ED (odds ratio [OR] 8.4), need ED intubation (OR 12.2), need hospital admission (OR 29.3) and need ICU admission (OR 53.5).
All these authors conclude that trans-mucosal midazolam is more convenient, easier to use, just as safe, and is more socially acceptable than rectal diazepam. Furthermore, when given via the intranasal route, midazolam is more effective than rectal diazepam.
The above evidence clearly suggests that intranasal midazolam is superior to rectal midazolam for seizure therapy in children. However, IV benzodiazepines are first-line therapy in most hospitals—how does intranasal midazolam compare to IV benzodiazepines? Three randomized controlled trials comparing intranasal midazolam to IV diazepam answer this question.[11, 12, 26] Lahat et al compared intranasal midazolam to IV diazepam in children seizing 10 minutes or longer. Patients were randomized to receive diazepam, 0.3mg/kg IV, or midazolam 0.2 mg/kg intranasally. Nasal midazolam stopped 23 (88%) of 26,whereas 24 (92%) of 26 were controlled with IV diazepam (P = non significant). The mean time from patient arrival to seizure cessation was 6.1 minutes with midazolam and 8.0 minutes with diazepam. The authors conclude that intranasal midazolam was as safe and effective as IV diazepam, but the overall time to cessation of seizures after arrival at the hospital was faster with intranasal midazolam because of the time required to establish an IV line in the diazepam group. A similar study was conducted by Mahmoudian and Zadeh. These authors compared the efficacy of intranasal midazolam (0.2 mg/kg) to IV diazepam (0.2 mg/kg) in 70 patients (ages 2 to 15 years) presenting to the emergency department with seizure activity. Both methods were equally effective, and no adverse effects occurred in either group. Javadzadeh compared IV diazepam 0.3 mg/kg to intranasal midazolam 0.2 mg/kg in children suffering prolonged seizures. (click here for free article) From time of drug delivery to cessation of seizure IV drug worked in 2.16 minutes while nasal worked in 3.16 minutes. However, due to delays related to establishing an IV, the time to control a seizure using IV diazepam was statistically and clinically significantly longer (6.42 minutes). Both therapies were 100% effective in the 60 patients treated. Thakker also conducted a randomized trial comparing IN midazolam to IV diazepam showing clinical equivalency in terms of seizure cessation but much faster resolution of the seizure when the nasal drug is given – all due to no need for an IV line. The time differences may be clinically significant in terms of brain hypoxia and potential long term outcomes – 6.7 minutes with nasal drug versus 17.2 minutes with IV therapy. In this study the resolution rates for single dose therapy were only 65 to 66% - very similar to other studies conducted outside of wealthy western countries (this study is from India). This is probably due to the very high incidence of CNS infections which was 26% in this study. Sharma and Harish provide yet another prospective study on the topic in 2013. They randomized 100 children in their ER or NICU who were seizing to either intranasal midazolam or intravenous midazolam for the treatment of status epilepticus. As in every other prospective trial on the topic the two treatment are equivalent in terms of efficacy: In this study both were successful at stopping seizures 94% of the time with a single dose. The intranasal route was also slightly faster likely due to the delays associated with IV line establishment. Unique to this study was the inclusion of neonates: There were 7 neonates in this study and an additional 26 children under the age of 1 year. (Click here for free article)
All these authors conclude that nasal midazolam
works faster, is safe, is easy to use and
should be used not only in medical centers but also in general
practitioners’ offices as well as at home by families of seizure-prone
children after appropriate instruction. Evidence in the next
paragraphs supports these conclusions.
Evidence in the next paragraphs supports these conclusions.
greatest benefit of intranasal midazolam will be for the treatment of
seizures in the prehospital, home or extended care setting. Wilson et al sent intranasal midazolam home with families of
children suffering epilepsy and found that 33 of 40 (83%) who used it
found it effective and 20/24 (83%) preferred using transmucosal
midazolam to rectal diazepam. Harbord reported experience using
intranasal midazolam for home treatment of 54 seizures in 22
children. These authors found it to be 89% effective, with no
evidence of respiratory compromise. Ninety percent of families found no
difficulty with nasal medication administration. Of the 15 parents with
previous rectal diazepam experience, 13 thought intranasal delivery was
easier and 14 preferred it to the rectal route. Jeannet et al, used
intranasal midazolam both on the medical wards and as home therapy.
Their experience with 26 children suffering 125 seizures note a 98%
effectiveness in under 10 minutes with no serious adverse effects.
When compared to rectal diazepam they report that the intranasal
route was both easier to use and that postictal recovery was faster.
Scheepers et al report their experience with intranasal medication
delivery in an extended care facility caring for adolescents and adults
with severe epileptic disorders. Of 84 uses, they found this route
to be effective in 79 (94%). In the 5 instances when it was not
effective, 3 of the 5 doses were delivered intra-orally rather than
intranasally. In August 2010 Holsti published data from her
prospective randomized trail comparing IN midazolam to rectal
diazepam. These authors trained 358 families to use nasal midazolam
and rectal diazepam. They then randomized the families to one or the
other therapies to be administered only if seizures lasted over 5
minutes. There were 92 patients treated - 50 with nasal and 42 with
rectal drug. Seizure control was slightly faster with nasal drug (3 vs.
4.3 minutes) and was preferred by parents in terms of ease of
administration and overall satisfaction. It was felt to be considerable
less expensive and more cost effective (though the felt cost studies
should be formally conducted.)
In August 2010 Holsti published data from her prospective randomized trail comparing IN midazolam to rectal diazepam. These authors trained 358 families to use nasal midazolam and rectal diazepam. They then randomized the families to one or the other therapies to be administered only if seizures lasted over 5 minutes. There were 92 patients treated - 50 with nasal and 42 with rectal drug. Seizure control was slightly faster with nasal drug (3 vs. 4.3 minutes) and was preferred by parents in terms of ease of administration and overall satisfaction. It was felt to be considerable less expensive and more cost effective (though the felt cost studies should be formally conducted.)
A 2010 review on the topic concluded that midazolam by any route -
specifically IN or buccal - is superior to diazepam by any route
(including IV) for the treatment of status epilepsy. However, at
about the same time, another article was published that compared IN
midazolam (10 mg) to rectal diazepam (10 mg) in 21 adults suffering 124
different seizures and no difference in efficacy or time to effect was
found. Never the less - 16 of 21 caregivers and the patient
preferred nasal midazolam over rectal diazepam.
A 2010 review on the topic concluded that midazolam by any route - specifically IN or buccal - is superior to diazepam by any route (including IV) for the treatment of status epilepsy. However, at about the same time, another article was published that compared IN midazolam (10 mg) to rectal diazepam (10 mg) in 21 adults suffering 124 different seizures and no difference in efficacy or time to effect was found. Never the less - 16 of 21 caregivers and the patient preferred nasal midazolam over rectal diazepam.
In 2013 Veldhorst-Janssen published a PhD thesis on intranasal drug
In 2013 Veldhorst-Janssen published a PhD thesis on intranasal drug delivery.This was a study interviewing adult epileptics regarding their preference for nasal versus rectal drug to treat their recurrent seizures. Despite pretty apparent increase in efficacy (75 vs. 55 on a 100 point scale of preference), impression of better convenience (71 vs. 58) and overall global satisfaction (68 vs. 56) with the nasal drug, the sample size of 25 patients did not provide the statistical power to prove preference. Interestingly they also found that the side effect profile of the rectal drug was preferred. However, there are profound differences in the two study groups in terms of frequency of seizures, educational background, etc. so most of these conclusions are suspect. Never the less – here is a study showing nasal midazolam is useful in adults though I suspect they used a higher concentration than the generic IV formulation.
Graph showing Adult patient satisfaction with rectal
diazepam versus nasal midazolam 
Graph showing Adult patient satisfaction with rectal diazepam versus nasal midazolam 
Also in 2013, Humphries and Eiland wrote a review of intranasal midazolam for the treatment of acute seizures. The article provides a very nice up to date overview of the pharmacokinetics and absorptive properties of benzodiazpines for anyone who is interested. They also provide an extensive review of the literature regarding the two currently available rapid methods of treating seizures in an outpatient setting – rectal diazepam versus nasal midazolam – including cost differences (a few hundred dollars for ONE DOSE for rectal versus less than 20 dollars a dose for nasal). They conclude that “Intranasal midazolam should be considered as an anticonvulsant agent for community, prehospital, and ED use in children when intravenous access is not available and the rectal route is not desirable.” (Click here for link to FREE ARTICLE)
Intranasal midazolam for seizure control is now entering numerous
status epilepsy protocols. In patients with brain tumors near the
end of life it is often difficult for them to take anything by mouth.
For that reason IN midazolam is suggested as a method for controlling
their seizures and improving their quality of life.
Intranasal midazolam for seizure control is now entering numerous status epilepsy protocols. In patients with brain tumors near the end of life it is often difficult for them to take anything by mouth. For that reason IN midazolam is suggested as a method for controlling their seizures and improving their quality of life.
Intranasal lorazepam, another anti-seizure medication, also appears effective and safe for treating status epilepsy based on a single trial. A large study conducted in rural Africa compared intranasal lorazepam to intramuscular paraldehyde (a common medication used in the third world to seizure therapy) in 160 patients, most of whom were seizing for an extended time period (mean seizure duration was over 2 hours). Despite these prolonged seizures, intranasal lorazepam managed to stop three quarters of the seizures in a few minutes, while intramuscular medication only worked 61% of the time. There were no respiratory side effects seen with the lorazepam.
This same group of researchers then designed a study to compare IN
lorazepam to buccal lorazepam and IV lorazepam. Their goal was to prove
that these non-invasive routes of administration were just as effective
as the "gold standard" IV delivery route yet easier to deliver and not
requiring any shot or skill set required to deliver the shot.
Interestingly and unfortunately they had to stop the study because on
interim analysis of the data they found the buccal route (but not the
nasal route) was more than 30% less effective than the other routes. You
can see the study design and comments on termination at this web site
This same group of researchers then designed a study to compare IN lorazepam to buccal lorazepam and IV lorazepam. Their goal was to prove that these non-invasive routes of administration were just as effective as the "gold standard" IV delivery route yet easier to deliver and not requiring any shot or skill set required to deliver the shot. Interestingly and unfortunately they had to stop the study because on interim analysis of the data they found the buccal route (but not the nasal route) was more than 30% less effective than the other routes. You can see the study design and comments on termination at this web site link: http://clinicaltrials.gov/ct2/show/NCT00343096
Editorial comment: This is a recurring finding in the acute pain literature and now in the seizure literature - buccal drug delivery results in lower drug levels and peaks later than nasal drug delivery so it is not ideal for treating medical problems that require rapid onset of action. Fortunately other researchers have done similar studies without the buccal arm and shown that nasal delivery is indeed as effective as IV lorazepam delivery for actually stopping seizures - see below.
In January of 2012, Anderson et al published a study that explains
why buccal lorazepam was inferior to nasal midazolam. U
In January of 2012, Anderson et al published a study that explains why buccal lorazepam was inferior to nasal midazolam. Using a crossover design volunteer study they found that buccal drug does not absorb as rapidly as nasal drug and so is not as clinically effective for disease states that require rapid onset of action (seizure, breakthrough pain, opiate reversal for examples). Nasal lorazepam achieves therapeutic levels in the blood and CSF more rapidly and therefore its clinical onset of action is earlier. The diagram below shows resulting serum levels in the first 10 minutes.
The authors make the following conclusions: "The results from the present study suggest that the intranasal administration route leads to a significantly faster detectable concentration of lorazepam in plasma than the buccal route for the termination of prolonged seizures. Our findings suggest that intranasal, rather than buccal, lorazepam is likely to be more appropriate for the management of children with acute seizures."
In February of 2011
In February of 2011a potentially practice changing article was published on the topic. The authors conducted a randomized trial comparing what many of us consider the gold standard for status epilepticus initial therapy - IV lorazepam, to the same dose of lorazepam given intranasally. The results showed identical efficacy and identical suppression of recurrent seizures over the next hour. Not mentioned in the abstract is the fact that the results are based on seizure control from the time of drug administration. They admit the nasal drug was given "virtually instantaneously" whereas the IV drug took between 1 and 25 minutes (median 4 minutes) to administer (due to difficulty of experience pediatric clinicians successfully starting an IV in a seizing child). This concept needs to be studied further in adults - lorazepam is more potent than midazolam and may be a better drug for both seizure control and excited delirium control in a full grown adult due to this potency difference.
Click here for a thoughtful editorial written by Dr. Jacqueline
French  on this IN lorazepam article:
Benzo vs. Benzo: And the winner is...., Epilepsy Curr 2011
Click here for a thoughtful editorial written by Dr. Jacqueline French  on this IN lorazepam article: French, Benzo vs. Benzo: And the winner is...., Epilepsy Curr 2011
Another study and its accompanying editorial of importance to this discussion were published in the New England Journal of Medicine in February 2012.[24, 25] While this study does not actually use intranasal medications to treat seizures, it is a very important and well done trial that is applicable to the discussion regarding therapy for status epilepsy. These authors found that intramuscular midazolam was as good if not better than intravenous lorazepam for rapid termination of status epilepsy. The reason is due to ease of drug delivery and therefore rapid drug delivery. Of course this is also the reason that intranasal midazolam and lorazepam are as effective as intravenous benzodiazepines in all the studies reviewed here. For some reason they make a very odd comment supported by absolutely no data - "Midazolam can be administered by other nonintravenous routes as well, but the intramuscular route is more consistently effective than the intranasal or buccal routes because the drug cannot be blown or spat out by the convulsing patient." This is not true. First of all, the literature suggests otherwise and the editorial in the same issue of the NEJM points out 3 reference showing IM benzodiazepines absorb LESS rapidly than nasal drugs (two references can be found in the seizure section of this web site - O'REgan 1996, Wermeling 2009). Secondly, this statement shows the lack of experience of the authors who wrote it - IN drugs are very easy to deliver to a seizing patient if you use a syringe driven atomizer and the patient is unconscious so they can't spit it back at your. Finally, many other studies for other drugs like opiates show more rapid onset of action and much higher patient satisfaction with IN versus IM drugs so I am not sure why these authors or the NEJM editorialist would allow this opinion to be stated. Never this less, this is a great study that demonstrates non intravenous therapy is essentially as effective as IV delivery of benzodiazepines for treatment of seizures and it is a lot easier to administer. It will be interesting to find out what the final version of this therapy costs. Currently the only FDA approved drug for out-patient seizure therapy is rectal diazepam and it costs well over $200-300 per dose in a U.S. pharmacy while being much less effective than nasal, intramuscular or intravenous therapy. Given this current cost, this new therapy will likely demand a similar price. Our EMS system, local emergency departments and our community pediatric neurologists use generic midazolam as first line therapy in the EMS, ER and outpatient setting - at about $2-3 per dose plus a few dollars for the delivery device. They have used this therapy for almost a decade and their success rates are similar or superior to those found in this study.[10,18]
Although early data demonstrated poor bioavailability of nasal diazepam, the pharmaceutical industry has recognized an opportunity for nasal benzodiazepines and we are in the midst of research with modified diazepam molecules to make them more available via the nasal mucosa. There is a plethora of older data on this but as of 2014 it appears to be more mature so it is time to begin providing recent literature on this topic.
Henney et al found a modified IN diazepam
formulation (enhanced for nasal delivery) similar in terms of
bioavailability as rectal diazepam gel. They believe this offers
caregivers and patients a more socially acceptable and convenient method
for treating seizures. 
This data is fairly compelling. Multiple studies from different authors throughout the world confirm that intranasal midazolam (and in now IN lorazepam) is a safe and very effective means to achieve seizure control at home, in the ambulance and in the hospital. Its rapid onset of action, social acceptability, ease of use and efficacy suggest that this therapy should be adopted in appropriate situations (prolonged seizures) where IV access is not immediately available.
Tom Macfarlane, MD. Emergency Physician, Salt Lake City, Utah:
I have extensive experience in using intranasal midazolam in the hospital and home settings. As an emergency physician I frequently care for patients who are experiencing seizures. It is often difficult to establish intravenous access in these seizing patients and therefore transmucosal drug delivery is a great option. I also have a 4 year-old son who experiences frequent prolonged seizures. My family and I have safely administered over 60 transmucosal doses of midazolam over the course of 3 years. This has allowed us to avoid many trips to the Emergency Department and provides us with a degree of increased freedom. I am confident that my son would not be functioning at the level he is today without intranasal midazolam.
Margaret Krykou , MD- South Australian physician
discussing experience with in home use of intranasal midazolam:
Margaret Krykou , MD- South Australian physician discussing experience with in home use of intranasal midazolam:
Note: Midazolam is now available in prefilled syringes. Just connect an atomizer and deliver the correct dose.
Prefilled syringes of medication:
Based on extensive research and community use, prepackaged midazolam in the 5mg/ml dosing would certainly seem appropriate for use by properly trained families and BLS providers - and this packaging would surely help improve the ease of use. See this PDF file for the information on many prepackaged medications including midazolam and lorazepam: Carpuject medications In situations where the entire volume might not be appropriate (smaller child), the syringe can have a indelible mark or piece of tape applied by the clinician or pharmacy at the appropriate dosage so the parent/provider knows how much to give. Just be sure to use the proper concentration.
Carpuject of midazolam (has a Luer attachment for a needle or atomizer)
Intranasal midazolam for acute seizures
Indications: For treatment of persistent seizure activity
- Assess ABC’s – Airway, Breathing, Circulation
- For pulseless patients, proceed to ACLS guidelines
- Apply 100% oxygen NRB mask to seizing patient
- Use age based table to determine proper volume of midazolam for atomization (see table below)
- To calculate it manually, use the below
- Assess weight: children weight in kg = 10 + 2(Age in years)
Calculate appropriate dose of midazolam using the following
- Children: Total kg wt X 0.2 mg = total mg dose of midazolam, maximum of 10 mg
- Adults over 50 kg: 10 mg (2 ml) of midazolam
- Total volume in milliliters of midazolam (5mg/ml concentration) = (Total mg dose divided by 5mg/ml) + 0.1 ml for dead space of device.
- (If using lorazepam - 0.1 mg/kg to max 4 mg)
- Load syringe with appropriate milliliter volume of midazolam (use only 5mg/ml concentration) and attach nasal atomizer
- Place atomizer within the nostril
- Briskly compress syringe to administer 1/2 of the volume as atomized spray.
- Remove and repeat in other nostril, so all the medication is administered
- Continue ventilating patient as needed
- If seizures persist 5 minutes after treating, consider repeating ½ dose of midazolam either intranasally, intramuscularly or intravenously. Secure airway if necessary.
IN Midazolam volume in ml*
Volume Dose (mg)
0.3 ml 0.6 mg
0.4 ml 1.2 mg
0.5ml 2.0 mg
0.7 ml 2.8 mg
0.8 ml 3.2 mg
0.9 ml 3.6 mg
1.0 ml 4.0 mg
1.0 ml 4.4 mg
1.1 ml 4.8 mg
1.2 ml 5.2 mg
1.3 ml 5.6 mg
1.4 ml 6.0 mg
1.4 ml 6.4 mg
1.5 ml 6.8 mg
1.8 ml 8.0 mg
Adult or full-grown teenager
> 50 kg
2.0 ml 10.0 mg
* This volume is based on the calculated dose PLUS 0.10 ml dead space in the device (the amount of medication that will remain within the syringe and atomizer tip and therefore will not be delivered to the child). The total volume is then rounded off to the next highest 0.1 ml. Slightly higher doses may be appropriate at the lower range of volume (in smaller children) due to measurement difficulties and possible under dosing which may not stop the seizure.
In some children a higher dose (0.3 mg/kg) may be more appropriate
Video of a family successfully treating their seizing child with intranasal midazolam in a city park
Home therapy for seizures:
- Download a condensed version of IN midazolam therapy for seizures as a PDF file
- Down load file photo sequence of home IN therapy compiled by mother of epileptic child (Click here for PDF document 0.41 MB)
Peer Reviewed full articles
Lahat, IN midazolam for seizures, BMJ 2000 (click here) - PDF 0.25 MB
Javadzadeh, M., K. Sheibani, et al. (2012). "Intranasal midazolam compared with intravenous diazepam in patients suffering from acute seizure: A randomized controlled trial." Iran J Pediatr (click here)
Other articles and abstracts
- Whitesell, IN midazolam vs rectal diazepam - synthesis of the evidence, J Ped Healthcare 2009 abstract
- Ma, Clinical guidelines for status epilepsy in children, Hong Kong J Paediatrics 2010
- French JA.. Benzo vs Benzo: And the winner is.. Epilepsy Curr 2011;11(5):143-144.
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21. Arya, R., S. Gulati, et al. (2011). "Intranasal versus intravenous lorazepam for control of acute seizures in children: A randomized open-label study." Epilepsia.
22. French JA.. Benzo vs Benzo: And the winner is.. Epilepsy Curr 2011;11(5):143-144 (click here for the open access article)
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