Baby Safety / Compounds / Praziquantel

Is Praziquantel safe for babies and kids?

Moderate risk for kids

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Praziquantel poses heightened risk.

What is praziquantel?

The IUPAC name is 2-(cyclohexanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one.

Also known as: 2-(cyclohexanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one, Biltricide, Droncit, Embay 8440.

IUPAC name
2-(cyclohexanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one
CAS number
55268-74-1
Molecular formula
C19H24N2O2
Molecular weight
312.4 g/mol
SMILES
C1CCC(CC1)C(=O)N2CC3C4=CC=CC=C4CCN3C(=O)C2
PubChem CID
4891

Risk for babies

Moderate risk

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Praziquantel poses heightened risk.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Elevated risk

Praziquantel poses pregnancy risk through potential teratogenicity, altered pharmacokinetics (increased blood volume, changed CYP activity), and placental transfer. FDA pregnancy category should be evaluated.

Suspected reproductive toxicant (GHS H361) or suspected endocrine disruptor. Precautionary approach warranted. Animal studies or limited human data suggest developmental toxicity potential.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

3 regulatory and scientific bodies have classified Praziquantel. The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2023Not evaluated by IARC as carcinogenic — praziquantel is a WHO Essential Medicine and FDA-approved anthelmintic for schistosomiasis and tapeworm infections; no carcinogenicity classification from IARC, NTP, or EPA; long-term safety record in global mass drug administration programs
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 1 positive / 4 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 1 positive / 4 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter praziquantel

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Praziquantel:

  • Alternative drug class; Non-pharmacological therapy; Lowest effective dose
    Trade-offs: Direct chemical substitution requires verification that the replacement does not introduce new hazards (regrettable substitution). Conduct full hazard assessment of proposed alternative before adoption.
    Relative cost: 1.2-2×

Frequently asked questions

Is praziquantel safe for kids?

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Praziquantel poses heightened risk.

What products contain praziquantel?

Praziquantel appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to praziquantel?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about praziquantel?

Praziquantel has been classified by 3 agencies including IARC, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Praziquantel in the baby app

Look up products containing praziquantel, compare to alternatives, and explore the full data record.

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Sources (1)
  1. Praziquantel WHO Essential Medicine Schistosomiasis MDA; Biltricide FDA Approved 1982; Schistosoma mansoni haematobium japonicum Treatment; (R)-Enantiomer Active Antischistosomal; CYP3A4 Hepatic Metabolism; Calcium Ion Influx Tegument Disruption; IARC Not Evaluated; Herxheimer Parasite Die-Off; WHO MDA Billions Doses Africa Asia; Schistosoma haematobium IARC Group 1 Bladder Cancer Endemic (2023) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →