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For trained clinicians only. These are high-risk seizure medicines. During an active seizure, monitor airway, oxygen saturation, breathing, blood pressure, and ECG. Have bag-mask ventilation and resuscitation equipment ready.
For a convulsive seizure lasting 5 minutes or more, give one benzodiazepine first (usually midazolam or diazepam), then give a longer-acting antiseizure drug such as levetiracetam. Do not routinely give clonazepam + midazolam + diazepam together because breathing can stop.
| Drug | Simple mechanism | Main uses | Typical acute seizure dose | How to give / dilution | Important contraindications or avoid/caution | Common side effects |
|---|---|---|---|---|---|---|
| Levetiracetam | Binds SV2A, a protein on nerve vesicles. This reduces abnormal electrical firing in the brain. | Focal seizures; generalized tonic-clonic seizures; commonly used after a benzodiazepine in status epilepticus. | Status epilepticus, IV: 60 mg/kg, maximum 4,500 mg, usually over 10-15 min. Example: 70-kg adult = 4,200 mg. Local protocols may use 1,000-3,000 mg. | IV only for injectable form. Usual vial concentration is 100 mg/mL. Dilute in 100 mL of 0.9% saline, 5% dextrose, or Ringer's lactate and infuse over 15 min. In children/fluid restriction, use enough diluent to keep final concentration ≤15 mg/mL. | True allergy to levetiracetam. Reduce maintenance dose in renal impairment. Use caution with major agitation, depression, psychosis, or suicidal thoughts. | Sleepiness, dizziness, fatigue, irritability, agitation, anger or mood change. Rare: psychosis, severe rash, suicidal thoughts. |
| Midazolam | A benzodiazepine. Increases the effect of GABA, the brain's main “brake” chemical. Rapidly stops seizures. | First-line medicine for prolonged convulsive seizure/status epilepticus, especially if IV access is not available. Also sedation/procedures. | Adult IM: 10 mg once. IV: commonly 0.1-0.2 mg/kg slow IV, maximum often 10 mg. Intranasal/buccal: often 0.2 mg/kg in pediatric rescue plans, maximum varies by protocol. | IM: give directly, no dilution. IV: give slowly, titrating to seizure cessation and breathing. If dilution is required by local policy, use 0.9% saline or 5% dextrose and label clearly. Intranasal use should use an approved nasal preparation or a local emergency protocol. | Allergy to benzodiazepines; severe respiratory depression without ability to ventilate; shock/coma; acute narrow-angle glaucoma. Use major caution with opioids, alcohol, other sedatives, elderly people, liver disease, and severe lung disease. | Drowsiness, confusion, low blood pressure, reduced breathing or apnea, low oxygen, paradoxical agitation. Dependence/withdrawal with repeated use. |
| Diazepam | Benzodiazepine. Enhances GABA action and quickly suppresses seizure activity. | Status epilepticus; recurrent severe convulsions; rescue treatment for seizure clusters. Also muscle spasm and anxiety in selected settings. | Adult IV: 5-10 mg slow IV. May repeat after 5-10 min if needed. Common maximum total is 30 mg, but follow local protocol. Rectal rescue: dose is weight/age based using the prescribed product. | Do not dilute or mix diazepam injection with other medicines/fluids in a syringe or infusion bag. Give slow IV directly into a large vein, or slowly through IV tubing near the cannula site. It can precipitate when mixed. Avoid IM for emergency seizure control because absorption is unreliable. | Allergy; severe respiratory insufficiency without ventilatory support; sleep apnea; myasthenia gravis; acute narrow-angle glaucoma; severe hepatic impairment. Avoid or use extreme caution with opioids/alcohol/other sedatives. | Sleepiness, confusion, ataxia, hypotension, injection-site pain/phlebitis, respiratory depression/apnea. Long use can cause tolerance, dependence, and withdrawal seizures. |
| Clonazepam | Benzodiazepine. Increases GABA inhibition in the brain. Longer-lasting than midazolam. | Maintenance/add-on treatment for some seizure types. IV clonazepam is used for status epilepticus in some countries and hospital protocols. | IV for seizures: commonly 0.5-1 mg slow IV, repeat only according to local protocol and response. Dose varies by country/product. It is not usually the first prehospital choice where IM/intranasal midazolam is available. | Injection preparation differs by brand. A common product contains 1 mg/mL with a supplied solvent. Reconstitute/dilute exactly with the manufacturer-supplied diluent, then give slow IV. Do not mix with other drugs unless compatibility is confirmed. | Allergy; severe respiratory insufficiency; sleep apnea; myasthenia gravis; severe liver impairment; acute narrow-angle glaucoma. Avoid combining with opioids, alcohol, or other sedatives unless airway support is available. | Drowsiness, dizziness, unsteady gait, poor coordination, confusion, behavior/mood change, respiratory depression, low BP. Long-term use can cause dependence and withdrawal. |
Quick memory aid
| Drug | Main role in a prolonged seizure |
|---|---|
| Midazolam | Fast first aid, especially IM/intranasal when there is no IV line |
| Diazepam | Fast IV or rectal rescue medicine |
| Clonazepam | Benzodiazepine option used mainly in hospital protocols or maintenance therapy |
| Levetiracetam | Follow-up antiseizure medicine to prevent seizures from returning. It is not as immediate as a benzodiazepine. |
Practical sequence for convulsive status epilepticus
- ABC first: position safely, suction if needed, oxygen, check blood glucose, obtain IV/IO access.
- If seizure is still continuing at 5 minutes: give one benzodiazepine, for example IM midazolam or slow IV diazepam.
- Give IV levetiracetam 60 mg/kg, maximum 4.5 g, as the longer-acting drug.
- If seizure continues, escalate urgently according to the hospital status-epilepticus protocol and involve emergency/ICU/neurology support.
Levetiracetam binds SV2A, whereas the three other medicines are benzodiazepines acting through GABA-A receptors. Katzung’s Basic and Clinical Pharmacology, 16th ed., antiseizure-drug mechanism and status epilepticus sections. The DailyMed levetiracetam label specifies dilution in 100 mL compatible fluid and infusion over 15 minutes. The DailyMed diazepam injection label states that diazepam should not be mixed or diluted.
Important: Doses differ for children, pregnancy, kidney disease, liver disease, elderly patients, and the exact concentration available in your hospital. Always check the local emergency protocol and the vial label before preparing the drug.
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Emergency seizure medicines: easy table
Use only by trained emergency staff. In an ongoing convulsive seizure, protect the airway, give oxygen, check glucose, monitor SpO₂, BP and ECG, and have bag-mask ventilation ready.
A seizure lasting 5 minutes or more is treated as convulsive status epilepticus.
- Give one benzodiazepine first: midazolam, diazepam, or clonazepam.
- Then give levetiracetam to reduce recurrence.
- Do not give midazolam + diazepam + clonazepam together unless a senior emergency/ICU clinician directs it. All three can cause apnea.
1. Main emergency drug table
| Drug | Simple mechanism | Emergency indication | Adult emergency dose | Pediatric emergency dose | How to give |
|---|---|---|---|---|---|
| Midazolam | Benzodiazepine. Increases GABA, the brain’s natural “brake,” so seizure activity stops rapidly. | First choice when there is no IV line. Prolonged convulsive seizure/status epilepticus. | IM: 10 mg once. IV: 0.1-0.2 mg/kg slow IV, maximum 10 mg. | IM/IV/IN: 0.2 mg/kg, maximum 10 mg. | Give IM into lateral thigh if no IV access. If IV access is available, give slowly. Intranasal/buccal use needs a local protocol or prescribed rescue plan. |
| Diazepam | Benzodiazepine. Enhances GABA and quickly stops seizure firing. | Prolonged seizure/status epilepticus, especially when IV access is available. Rectal form can be a rescue medicine. | 0.15-0.2 mg/kg IV, maximum 10 mg per dose. May repeat once after 5 minutes if still seizing, according to protocol. | 0.15-0.2 mg/kg IV, maximum 10 mg per dose. Rectal rescue dose depends on the licensed product/age/weight. | Give slow IV, no faster than 5 mg/min. Give directly into a large vein or via IV tubing close to the cannula. |
| Clonazepam | Benzodiazepine. Enhances GABA inhibition. It acts quickly and lasts longer than midazolam. | Alternative first-line IV benzodiazepine in some hospitals/countries. Also used for selected epilepsy syndromes. | 1 mg IV slowly, at a rate not faster than 0.5 mg/min. Some protocols allow one repeat dose after 10-15 min. | 0.015 mg/kg IV slowly, often maximum 0.5-1 mg depending on local protocol. | Reconstitute/dilute only as stated on the local vial/brand instructions. Give slow IV only. |
| Levetiracetam | Binds the SV2A protein on nerve vesicles. This reduces abnormal brain electrical discharge. It is not a benzodiazepine. | Longer-acting antiseizure loading medicine after the first benzodiazepine. Used in established status epilepticus and recurrent seizures. | 60 mg/kg IV, maximum 4,500 mg. | 60 mg/kg IV, maximum 4,500 mg. | IV infusion after benzodiazepine. Common emergency protocol: give over 10-15 min. Adjust later maintenance dosing in renal impairment. |
The emergency use of a benzodiazepine followed promptly by a longer-acting antiseizure drug is consistent with standard status-epilepticus treatment; levetiracetam 60 mg/kg, maximum 4.5 g, is a common second-line loading regimen. Goldman-Cecil Medicine, Status Epilepticus; Rosen’s Emergency Medicine, Seizure Management.
2. Preparation and dilution table
| Drug | Usual injection strength | Dilution needed? | Practical emergency preparation |
|---|---|---|---|
| Midazolam | Often 1 mg/mL or 5 mg/mL. Check ampoule. | No dilution needed for IM. IV may be given slowly undiluted in an emergency. | For IM, draw up the calculated dose and inject. For IV, give slowly in small increments while watching breathing and BP. Do not delay treatment to dilute it. If a local policy requires dilution, use compatible fluid such as 0.9% saline or 5% dextrose. |
| Diazepam | Usually 5 mg/mL | Do NOT dilute or mix with other drugs or IV fluids in a syringe/bag. | Example: 10 mg = 2 mL from a 5 mg/mL ampoule. Give slowly IV at a maximum of 5 mg/min. Inject directly into a large vein or into running IV tubing near the cannula. |
| Clonazepam | Brand dependent. Many products have a 1 mg ampoule plus a supplied diluent/solvent. | Yes, if the product supplies a solvent. Use the supplied solvent exactly as directed. | Common preparation: mix the clonazepam ampoule with the entire supplied diluent, then administer slow IV. Do not use a random dilution volume because formulations differ by country. Do not mix in the same syringe with other medicines. |
| Levetiracetam | Common vial: 100 mg/mL, usually 500 mg/5 mL | Yes, for vial concentrate. | Dilute the required dose in 100 mL 0.9% saline, 5% dextrose, or Ringer’s lactate. Infuse over 15 min according to the product label. In fluid-restricted children, use a smaller final volume but keep final concentration ≤15 mg/mL. |
The levetiracetam injection label specifies compatible diluents and a usual 15-minute IV infusion. The diazepam injection label specifically says do not mix or dilute diazepam.
Levetiracetam dilution examples
| Patient / dose | Amount of levetiracetam 100 mg/mL | Dilution |
|---|---|---|
| 20 kg child: 60 mg/kg = 1,200 mg | 12 mL | Add to compatible fluid. A practical final volume can be 100 mL, or a smaller final volume if fluid restricted, keeping concentration ≤15 mg/mL. |
| 50 kg patient: 60 mg/kg = 3,000 mg | 30 mL | Prepare in a compatible infusion volume, commonly final volume 100 mL. Give over 10-15 min according to emergency protocol. |
| ≥75 kg patient: dose capped at 4,500 mg | 45 mL | Prepare in compatible IV fluid, commonly final volume 100 mL. Give over 10-15 min. |
Important: If using a premixed levetiracetam IV bag rather than a vial concentrate, it may already be diluted. Check the bag concentration. Do not add more diluent unless the product label says to.
3. Indications, contraindications and cautions
| Drug | Main indications | Do not use / major contraindications | Use with major caution |
|---|---|---|---|
| Midazolam | Active prolonged convulsion, status epilepticus, seizure clusters, procedural sedation. | Allergy to benzodiazepines; acute narrow-angle glaucoma. | Respiratory depression, severe COPD, sleep apnea, shock, reduced consciousness, liver disease, older age. Extreme caution with alcohol, opioids, sedatives, or anesthetics. |
| Diazepam | Active prolonged seizure/status epilepticus, seizure-cluster rescue, muscle spasm. | Allergy to benzodiazepines; acute narrow-angle glaucoma; myasthenia gravis; severe respiratory failure without ventilatory support. | Elderly/frail patient, shock, severe lung disease, sleep apnea, liver impairment, alcohol/opioids/other sedatives. Avoid IM injection for emergency seizure control because absorption is unreliable. |
| Clonazepam | Alternative IV treatment for status epilepticus in some settings; maintenance therapy for selected seizure disorders. | Allergy to benzodiazepines; severe respiratory insufficiency; severe liver disease; acute narrow-angle glaucoma. | Myasthenia gravis, sleep apnea, COPD, shock, older age, other sedative medicines. |
| Levetiracetam | Focal seizures, generalized tonic-clonic seizures, second-line loading in status epilepticus. | Known allergy to levetiracetam. | Renal impairment: reduce ongoing maintenance dose. Watch closely in patients with depression, agitation, psychosis, or suicidal thoughts. |
4. Side effects to watch for in emergency
| Drug | Common side effects | Dangerous side effects: act immediately |
|---|---|---|
| Midazolam | Sleepiness, confusion, dizziness, unsteady movement, low BP. | Slow breathing, apnea, low oxygen saturation, aspiration, severe hypotension, paradoxical agitation. |
| Diazepam | Drowsiness, confusion, dizziness, unsteady gait, vein irritation. | Apnea, respiratory depression, hypotension, bradycardia, cardiac arrest. Risk rises greatly with opioids/alcohol/other sedatives. |
| Clonazepam | Sleepiness, dizziness, poor coordination, confusion, behavior change. | Respiratory depression/apnea, hypotension, excessive sedation. |
| Levetiracetam | Sleepiness, dizziness, weakness, irritability, agitation. | Severe agitation, aggression, psychosis, suicidal thinking, severe rash/allergic reaction. Respiratory depression is much less typical than with benzodiazepines. |
5. Simple emergency sequence
| Time | What to do |
|---|---|
| Immediately | Position patient safely, protect airway, suction if needed, oxygen, monitor SpO₂/BP/ECG, check capillary glucose, obtain IV or IO access. |
| At 5 min of continuous convulsion | Give one benzodiazepine: IM midazolam if no IV access, or slow IV diazepam/clonazepam if IV access is available. |
| Immediately after benzodiazepine | Start levetiracetam 60 mg/kg IV, maximum 4.5 g. Do not wait for the benzodiazepine to fail completely before ordering the loading drug. |
| If seizure continues | Call senior emergency/ICU/neurology help. Consider second-line/refractory-status protocol, airway control and continuous EEG where available. |
Key safety points
- Benzodiazepines stop seizures fast but can stop breathing.
- Use only one first-line benzodiazepine dose strategy, unless escalation is directed by an experienced clinician.
- Diazepam must not be diluted or mixed.
- Levetiracetam must be diluted if supplied as a vial concentrate.
- Always calculate pediatric doses by weight in kg and recheck with another clinician.
- Follow your hospital, ambulance service, or national seizure protocol if it differs from this table. Product strengths and clonazepam preparation differ across countries.
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Emergency Seizure Drug Notes
Important emergency rule
A convulsive seizure lasting 5 minutes or more is treated as status epilepticus.
| Step | What to do |
|---|---|
| 1. Immediate care | Place patient safely, protect from injury, check ABC (airway, breathing, circulation), give oxygen if needed, suction secretions, check blood glucose, obtain IV/IO access, attach SpO₂, BP, ECG monitoring. |
| 2. Stop seizure fast | Give one benzodiazepine: midazolam, diazepam, or clonazepam. |
| 3. Prevent recurrence | Give a longer-acting antiseizure loading drug, such as levetiracetam. |
| 4. If seizure continues | Call emergency/ICU/neurology support. Prepare for airway support and refractory status epilepticus protocol. |
Do not give midazolam, diazepam, and clonazepam together routinely. They are all benzodiazepines and can cause severe sedation, hypotension, and respiratory arrest, especially with opioids or alcohol.
Quick comparison table
| Drug | Drug group | Main emergency role | Main route in emergency |
|---|---|---|---|
| Midazolam | Benzodiazepine | Fast first-line seizure stopping drug, especially if there is no IV line | IM, IV, intranasal, buccal |
| Diazepam | Benzodiazepine | Fast first-line seizure stopping drug when IV access is available; also rectal rescue medicine | Slow IV, rectal |
| Clonazepam | Benzodiazepine | Alternative slow-IV first-line drug in some hospital/country protocols | Slow IV |
| Levetiracetam | Antiseizure medicine, non-benzodiazepine | Second-line loading medicine after benzodiazepine to prevent seizure recurrence | IV infusion |
1. Levetiracetam
| Item | Notes in easy language |
|---|---|
| Drug class | Antiseizure medicine. Not a benzodiazepine. |
| Mechanism of action | Binds to SV2A, a protein on nerve-cell vesicles. This reduces the release and spread of abnormal electrical signals that cause seizures. |
| Main emergency indication | Given after a benzodiazepine in ongoing or recurrent convulsive seizures/status epilepticus. It is also used for focal seizures and generalized tonic-clonic seizures. |
| Adult emergency loading dose | 60 mg/kg IV, maximum 4,500 mg. |
| Child emergency loading dose | 60 mg/kg IV, maximum 4,500 mg. |
| How fast to give | Usually IV over 10-15 minutes, depending on the local status-epilepticus protocol and product label. |
| Usual vial concentration | Commonly 100 mg/mL. One vial may contain 500 mg in 5 mL. Always verify the ampoule label. |
| Dilution | For a vial concentrate, dilute in 100 mL of compatible fluid: 0.9% normal saline, 5% dextrose, or Ringer's lactate. If fluid restricted, use a smaller final volume but keep the final concentration at 15 mg/mL or less. |
| Example: 20 kg child | Dose = 20 × 60 = 1,200 mg. If concentration is 100 mg/mL, withdraw 12 mL. Dilute appropriately and infuse over 10-15 minutes. |
| Example: 50 kg patient | Dose = 50 × 60 = 3,000 mg. At 100 mg/mL, withdraw 30 mL. Dilute and infuse. |
| Example: 80 kg patient | Calculated dose is 4,800 mg, but maximum is 4,500 mg. At 100 mg/mL, withdraw 45 mL. |
| Contraindication | Known serious allergy to levetiracetam. |
| Use with caution | Renal impairment: maintenance dose needs reduction. Caution with severe depression, aggression, agitation, psychosis, or suicidal thoughts. |
| Common adverse effects | Sleepiness, dizziness, weakness, fatigue, irritability, agitation, mood changes. |
| Serious adverse effects | Severe behavior change, aggression, psychosis, suicidal thoughts, severe allergic reaction or rash. |
| Key point | Levetiracetam usually does not cause the same degree of respiratory depression as benzodiazepines. |
The levetiracetam injection label specifies compatible diluents and 15-minute IV administration for the concentrated vial formulation. Levetiracetam acts through SV2A modulation. Katzung's Basic and Clinical Pharmacology, 16th ed., antiseizure drugs section.
2. Midazolam
| Item | Notes in easy language |
|---|---|
| Drug class | Benzodiazepine. |
| Mechanism of action | Increases the action of GABA-A, the main inhibitory or “braking” chemical in the brain. It rapidly stops abnormal seizure firing. |
| Main emergency indication | First-line drug for prolonged convulsions/status epilepticus, especially when there is no IV access. |
| Adult dose, no IV access | 10 mg IM once. Give into the outer thigh. |
| Adult IV dose | 0.1-0.2 mg/kg slow IV, commonly up to 10 mg. Follow local protocol. |
| Pediatric dose | 0.2 mg/kg IM, IV, or intranasal, maximum 10 mg. |
| Intranasal/buccal use | Used as a seizure rescue route when IV is not available. Use only an approved nasal product or local emergency protocol. |
| How to give IM | Give directly into the lateral thigh. No dilution is needed. |
| How to give IV | Give slowly IV while monitoring SpO₂, respiratory rate and BP. In an actively convulsing patient, do not delay treatment just to dilute the medicine. |
| Dilution | IM: no dilution. IV: often used undiluted for emergency bolus, but follow hospital policy and check the ampoule strength. If local policy requires dilution, use compatible normal saline or 5% dextrose. |
| Contraindications | Known allergy to benzodiazepines; acute narrow-angle glaucoma. |
| Major cautions | Severe respiratory disease, sleep apnea, shock, severe liver disease, frailty/older age, reduced consciousness, opioid or alcohol use. |
| Common adverse effects | Drowsiness, confusion, dizziness, unsteady gait, low BP. |
| Serious adverse effects | Slow breathing, apnea, low oxygen, aspiration, severe hypotension, rarely paradoxical agitation. |
| Key point | Best practical first drug if there is no IV line. Have oxygen, suction and bag-mask ventilation ready. |
3. Diazepam
| Item | Notes in easy language |
|---|---|
| Drug class | Benzodiazepine. |
| Mechanism of action | Enhances GABA-A activity, quickly calming excessive electrical activity in the brain. |
| Main emergency indication | Prolonged convulsion/status epilepticus; severe recurrent seizures. Rectal diazepam is used as a home/rescue treatment in prescribed seizure plans. |
| Adult IV dose | 0.15-0.2 mg/kg slow IV, maximum 10 mg per dose. A dose may be repeated once after about 5 minutes if seizure continues, according to the local protocol. |
| Pediatric IV dose | 0.15-0.2 mg/kg slow IV, maximum 10 mg per dose. |
| Common injection strength | Usually 5 mg/mL. |
| Calculation example | At 5 mg/mL, a 10 mg dose = 2 mL. |
| How to give | Give slow IV directly into a large vein, or inject slowly through running IV tubing as close as possible to the IV cannula. Maximum speed commonly 5 mg/min. |
| Dilution | Do not dilute. Do not mix with other medicines in the same syringe or IV bag. It can precipitate or become cloudy. |
| IM route | Avoid IM use for emergency seizure control because absorption is slow and unpredictable. |
| Rectal route | Use the prescribed rectal gel/device and its weight-based dose. Do not substitute IV ampoules for prescribed rectal products unless a qualified protocol specifically directs this. |
| Contraindications | Allergy to benzodiazepines, acute narrow-angle glaucoma, myasthenia gravis, severe respiratory failure without available ventilation. |
| Major cautions | Older/frail patients, sleep apnea, COPD or severe lung disease, low BP/shock, severe liver disease, concurrent opioids, alcohol or other sedatives. |
| Common adverse effects | Drowsiness, confusion, ataxia, dizziness, injection-site pain or phlebitis. |
| Serious adverse effects | Respiratory depression, apnea, low BP, bradycardia, cardiac arrest. |
| Key point | Diazepam works fast but its seizure-control effect may wear off, so give a longer-acting antiseizure medicine such as levetiracetam afterward. |
The diazepam injection label says not to mix or dilute diazepam injection with other solutions or drugs.
4. Clonazepam
| Item | Notes in easy language |
|---|---|
| Drug class | Benzodiazepine. |
| Mechanism of action | Enhances GABA-A receptor action. This increases inhibitory brain activity and suppresses seizures. |
| Main emergency indication | Alternative IV benzodiazepine for status epilepticus in some countries/hospital protocols. Also used as add-on maintenance therapy in selected seizure disorders. |
| Adult emergency dose | 1 mg IV slowly. |
| Maximum rate | Give at a maximum of 0.5 mg/min. Therefore, 1 mg should take at least 2 minutes. Some protocols use 2-5 minutes. |
| Pediatric emergency dose | 0.015 mg/kg IV slowly, with maximum dose determined by local protocol, often 0.5-1 mg. |
| How to give | IV only in the acute emergency setting. Give slowly while observing breathing, oxygen saturation and BP. |
| Dilution / reconstitution | This is brand and country dependent. Many clonazepam products are supplied with a clonazepam ampoule plus a separate solvent. Use the entire manufacturer-supplied solvent exactly as directed, then administer slowly. Do not guess the dilution volume. |
| Mixing | Do not mix clonazepam with other medicines in the same syringe unless compatibility is confirmed by the local pharmacy/protocol. |
| Contraindications | Allergy to benzodiazepines, severe respiratory insufficiency, severe liver impairment, acute narrow-angle glaucoma. |
| Major cautions | Sleep apnea, COPD/severe lung disease, myasthenia gravis, shock, older age, opioid/alcohol/other sedative use. |
| Common adverse effects | Drowsiness, dizziness, poor coordination, confusion, slurred speech, behavior changes. |
| Serious adverse effects | Respiratory depression, apnea, hypotension, excessive sedation. |
| Key point | Clonazepam is a benzodiazepine. It should not be routinely added on top of midazolam or diazepam unless directed by a senior emergency clinician. |
Intravenous clonazepam is used as a status-epilepticus option in some settings. Katzung's Basic and Clinical Pharmacology, 16th ed., Status Epilepticus section. IV diazepam and clonazepam can cause cardiovascular and respiratory depression, especially if other CNS depressants have been given. Goodman & Gilman's The Pharmacological Basis of Therapeutics.
Dosing summary for quick revision
| Drug | Adult dose | Child dose | Route | Maximum / speed |
|---|---|---|---|---|
| Midazolam | IM 10 mg once, or IV 0.1-0.2 mg/kg | 0.2 mg/kg | IM, IV, IN/buccal under protocol | Usually max 10 mg |
| Diazepam | 0.15-0.2 mg/kg | 0.15-0.2 mg/kg | Slow IV | Max 10 mg/dose; no faster than 5 mg/min |
| Clonazepam | 1 mg | 0.015 mg/kg | Slow IV | No faster than 0.5 mg/min |
| Levetiracetam | 60 mg/kg | 60 mg/kg | IV infusion | Max 4,500 mg; over 10-15 min |
Dilution summary for quick revision
| Drug | Dilute? | What to use / avoid |
|---|---|---|
| Midazolam | IM: no. IV: usually can be given slow undiluted in an emergency. | Follow local policy and ampoule concentration. |
| Diazepam | No. | Do not dilute and do not mix with other drugs or fluids. |
| Clonazepam | Usually requires reconstitution with its supplied solvent, depending on formulation. | Follow the exact manufacturer instructions for the available brand. |
| Levetiracetam concentrate | Yes. | Commonly dilute in 100 mL 0.9% saline, 5% dextrose, or Ringer's lactate. Final concentration should be ≤15 mg/mL if using a reduced volume. |
High-yield differences
| Question | Answer |
|---|---|
| Which is best if no IV access? | IM midazolam |
| Which should never be diluted? | Diazepam injection |
| Which drug is given after benzodiazepine to prevent recurrence? | Levetiracetam |
| Which drugs commonly depress breathing? | Midazolam, diazepam, clonazepam |
| Which drug needs renal-dose adjustment for maintenance therapy? | Levetiracetam |
| Which drug may cause aggression or mood changes? | Levetiracetam |
| What is the most dangerous shared adverse effect of benzodiazepines? | Respiratory depression or apnea |
| What should be monitored after benzodiazepines? | Airway, respiratory rate, SpO₂, BP, consciousness, ECG when available. |
Safety note: These are educational emergency notes, not a patient-specific prescription. Exact vial strengths, dilution requirements, pediatric limits, repeat doses and protocols vary by country and hospital. Check the drug label and your local emergency status-epilepticus guideline before administration.
Levetiracetam Clonazepam midazolam diazepam it's mechanism dose indications contraindications how to give how munch to dilute in emergency side effects in easy way table form detail in easy way
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