Metrogyl dose in pediatrics

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Metrogyl is the brand name for metronidazole. In pediatrics, the dose varies by indication. Let me check the textbooks for precise dosing.

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Now let me get the Red Book data and also check for amebiasis/anaerobic dosing:

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I now have comprehensive data from multiple authoritative sources. Here is the complete pediatric dosing for Metrogyl (Metronidazole):

Metrogyl (Metronidazole) - Pediatric Dosing

By Indication

1. Amebiasis (Intestinal & Amebic Liver Abscess)

Route	Dose	Frequency	Duration
Oral / IV	35-50 mg/kg/day	Divided in 3 doses (TDS)	7-10 days

Maximum: Does not exceed adult dose of 500-750 mg per dose TDS

(Goodman & Gilman's Pharmacological Basis of Therapeutics)

2. Giardiasis

Route	Dose	Frequency	Duration
Oral	15 mg/kg/day	Divided TDS (3 times per day)	5-7 days

Maximum per dose: 250 mg

(Yamada's Textbook of Gastroenterology)

3. Anaerobic Infections / Intra-abdominal Infections (Surgical / Bowel Flora)

Route	Dose	Frequency	Duration
IV	7.5 mg/kg/dose	Every 6 hours (QID)	As clinically indicated

Typically combined with a 2nd agent (e.g., ceftriaxone 50 mg/kg/day once daily, or gentamicin 2.5 mg/kg q8h) for bowel flora coverage
Severe/complicated infections: same dose 7.5 mg/kg q6h IV + cefepime 50 mg/kg q12h

(Rosen's Emergency Medicine)

4. Bacterial Vaginosis / Trichomoniasis

Age	Dose	Frequency	Duration
Children	30 mg/kg/day	Divided every 6 hours (QID)	7 days

Maximum: Does not exceed adult dose (500 mg BID or 2 g single dose)

(Dermatology, 5e)

Quick Reference Summary Table

Indication	Dose	Route	Frequency	Duration
Amebiasis	35-50 mg/kg/day	Oral/IV	TDS (÷3)	7-10 days
Giardiasis	15 mg/kg/day (max 250 mg/dose)	Oral	TDS (÷3)	5-7 days
Anaerobic/intra-abdominal infections	7.5 mg/kg/dose	IV	q6h (QID)	Per clinical course
Bacterial vaginosis / Trichomoniasis	30 mg/kg/day	Oral	q6h (÷4)	7 days

Key Points

Maximum dose: Should not exceed the standard adult dose in any indication
Neonates/infants: Use with caution - immature hepatic metabolism prolongs half-life; dose adjustments needed (typically longer dosing intervals)
Hepatic impairment: Dose reduction required as metronidazole is hepatically cleared
Palatability: The liquid formulation is intensely bitter and often refused by pediatric patients - masking with sweetened vehicles may be needed
Avoid alcohol during therapy and for 48 hours after (disulfiram-like reaction)
Tinidazole is often preferred over metronidazole in children >3 years for giardiasis due to single-dose efficacy (50 mg/kg, max 2 g) and better tolerability

Sources: Goodman & Gilman's Pharmacological Basis of Therapeutics; Yamada's Textbook of Gastroenterology; Rosen's Emergency Medicine; Red Book 2021 (AAP); Dermatology 5e

For dysentery

For amoebic dysentery in pediatrics, metronidazole is the drug of choice at 35–50 mg/kg/day in 3 divided doses for 7–10 days (from the previous answer). Let me get precise textbook data for both amoebic and bacillary dysentery.

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Metrogyl (Metronidazole) for Dysentery in Pediatrics

Metronidazole is used specifically for amoebic dysentery (caused by Entamoeba histolytica). It is not the drug of choice for bacillary (Shigella) dysentery.

Amoebic Dysentery / Amebic Colitis

Parameter	Details
Dose	35-50 mg/kg/day
Division	3 divided doses (every 8 hours)
Max per dose	750 mg
Route	Oral (or IV if unable to take orally)
Duration	7-10 days

For mild-moderate amebic colitis: 35 mg/kg/day in 3 divided doses x 7 days
For severe/invasive disease or amebic liver abscess: 50 mg/kg/day in 3 divided doses x 10 days

(Rosen's Emergency Medicine; Goodman & Gilman's; Dermatology 5e)

Important: Always Follow With a Luminal Amebicide

Metronidazole kills tissue trophozoites but NOT luminal cysts. After completing the metronidazole course, always add a luminal agent to ensure eradication:

Luminal Agent	Pediatric Dose
Paromomycin (preferred)	25-35 mg/kg/day in 3 divided doses x 5-10 days
Iodoquinol	30-40 mg/kg/day in 3 divided doses x 20 days
Diloxanide furoate	20 mg/kg/day in 3 divided doses x 10 days

Alternative: Tinidazole (for children >3 years)

If available, tinidazole is preferred over metronidazole - better tolerated, simpler dosing:

50 mg/kg/day once daily (max 2 g/day)
Duration: 3 days (intestinal) / 5 days (severe/liver abscess)
Also requires a luminal amebicide after

(Rosen's Emergency Medicine - Table 167.6)

Bacillary Dysentery (Shigella) - Note

Metronidazole has no role here. Drugs of choice:

Azithromycin 12 mg/kg on day 1, then 6 mg/kg/day for 4 days (preferred in children)
Ciprofloxacin or ceftriaxone depending on sensitivities

Key Points

Dysentery context = amoebic -> Metronidazole is first-line
Always pair with a luminal amebicide after completing metronidazole
Take with food to reduce GI side effects (nausea, metallic taste)
Avoid alcohol during treatment and for 48 hours after (disulfiram-like reaction)
Adjust dose in severe hepatic impairment (metronidazole is hepatically cleared)

Sources: Rosen's Emergency Medicine; Goodman & Gilman's Pharmacological Basis of Therapeutics; Katzung's Basic & Clinical Pharmacology 16e; Dermatology 5e

Levera dose inn pediatrics

Levera is the brand name for levetiracetam, an antiepileptic drug. Pediatric dosing varies by age group and seizure type. Let me pull the precise data from textbooks.

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Levera (Levetiracetam) - Pediatric Dosing

FDA-Approved Age Indications

Focal (partial) seizures: from 1 month of age
Myoclonic seizures (JME): from 12 years
Primary generalized tonic-clonic seizures: from 6 years

(Goodman & Gilman's Pharmacological Basis of Therapeutics)

Chronic / Maintenance Dosing (Oral)

By Age Group

Age Group	Starting Dose	Titration	Target / Max Dose
1 month - <6 months	7 mg/kg BID	Increase by 7 mg/kg BID every 2 weeks	Up to 21 mg/kg BID
6 months - <4 years	10 mg/kg BID	Increase by 10 mg/kg BID every 2 weeks	Up to 25 mg/kg BID
4 years - <16 years	10 mg/kg BID	Increase by 10 mg/kg BID every 2 weeks	Up to 30 mg/kg BID (max 3000 mg/day)
≥16 years (adolescent)	500 mg BID	Increase by 1000 mg/day every 2-4 weeks	Max 3000 mg/day

Formulation: Oral solution 100 mg/mL, tablets (250, 500, 750, 1000 mg)
Twice daily (BID) dosing throughout all age groups

Acute / Emergency Dosing (IV - Status Epilepticus)

Route	Loading Dose	Infusion Rate	Max
IV	20-60 mg/kg	Over 10-15 minutes	4500 mg (or per weight)

Second-line agent after benzodiazepines fail
Advantage over fosphenytoin/phenobarbital: no hepatic metabolism, no cardiac side effects, no sedation
Eliminated purely by renal excretion - no significant drug interactions

(Goldman-Cecil Medicine; Tintinalli's Emergency Medicine)

Dose Adjustment

Condition	Adjustment
Renal impairment	Reduce dose (renally cleared); adjust based on GFR
Hepatic impairment	No adjustment needed (not hepatically metabolized)
Neonates	Use with caution; longer half-life due to immature renal function

Key Points

Mechanism: Binds synaptic vesicle protein SV2A - reduces glutamate/GABA release; also inhibits N-type calcium channels
Pharmacokinetics: Rapidly and completely absorbed orally; plasma half-life 6-8 hours; no protein binding; no CYP interactions
No drug interactions - safe to combine with other antiepileptics, oral contraceptives, anticoagulants
Side effects: Somnolence, irritability/behavioral changes (most common in children), ataxia, dizziness
- Behavioral/mood changes are the most clinically significant pediatric concern - monitor carefully
Available as oral solution (100 mg/mL) - suitable for infants and young children who cannot swallow tablets
Can be used as monotherapy or adjunct therapy

Sources: Goodman & Gilman's Pharmacological Basis of Therapeutics; Tintinalli's Emergency Medicine; Goldman-Cecil Medicine

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