Perinatal EvidenceCompass
Prepopulated workbenchMED-097

Antipsychotics — second generation/newer

Clozapine

Second-generation or newer antipsychotic

Not a categorical safety rating

This record organizes questions; it does not close them.

The clinical fields and position statements are prepopulated from the public-source corpus. They have not completed individual dual extraction, formal appraisal, exact-label reconciliation, or multidisciplinary sign-off. Do not use this page to justify abrupt discontinuation or reflexive switching.

Inventory identity

What this record represents

Canonical generic name
Clozapine
Entity type
single-ingredient drug
Active component(s)
Clozapine
Formulation / route / interval
Oral; formulation varies
Attachment entry
Clozapine
Separate monograph status
No — cross-reference shared molecule monograph
Identity and cross-reference
Not populated in v0.95
Inventory verification confidence
Moderate — molecule-level source; exact product/jurisdiction pending

Decision taxonomy

Five positions kept separate

These are workbench statements for reviewer execution. They are not independently commissioned, patient-specific recommendations.

  1. 01

    Stable continuation

    Workbench statement

    Do not withhold or discontinue solely because of pregnancy or lactation. For this record, assess indication, prior response, relapse severity, dose/formulation, alternatives, exposure timing, and mapped evidence; individual commissioned adjudication remains pending.

  2. 02

    New initiation in pregnancy

    Workbench statement

    For a new start, prefer an effective option with the strongest diagnosis-specific efficacy and reproductive evidence when clinically suitable. This record has not received an individual, independently verified initiation ranking.

  3. 03

    Switch before conception

    Workbench statement

    Before conception, consider a switch only when expected benefit exceeds relapse, withdrawal, failed-switch, and dual-exposure risks. Build and monitor the plan before pregnancy when feasible; no universal switch direction is assigned here.

  4. 04

    Unplanned exposure

    Workbench statement

    After unplanned exposure, confirm product, route, dose, timing, indication, co-exposures, and symptoms; do not advise abrupt cessation. Use the mapped evidence and current label to decide whether any targeted fetal assessment is indicated.

  5. 05

    Delivery, postpartum & lactation

    Workbench statement

    Create separate delivery, postpartum-dose, neonatal-observation, and lactation plans. Do not infer breastfeeding suitability from pregnancy evidence or routinely taper before delivery without drug-specific support.

Linked evidence

8 mapped claim summaries

Mapping can include class-wide, framework, formulation, regulatory, or evidence-gap claims. A linked claim is not necessarily a drug-specific causal estimate.

B-033Provisional public source

Large adjusted cohorts do not show a meaningful overall increase in major congenital malformations for antipsychotics as a class.

Public-source certainty descriptor
moderate—large adjusted cohorts
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
first trimester
Comparator
no antipsychotic exposure
Effect or numbers carried forward

Huybrechts: atypical adjusted RR 1.05 (95% CI 0.96–1.16); typical adjusted RR 0.90 (0.62–1.31)

Limitations

Contextual class evidence only; do not treat the class point estimates as drug-, route-, fixed-combination-, emergency-formulation-, or LAI-specific estimates. Class averages can hide rare drug-specific effects; confounding, live-birth selection, and exposure misclassification remain.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-036Provisional public source

Clozapine, olanzapine, and quetiapine as a high-metabolic-risk group were associated with gestational diabetes and large-for-gestational-age birth.

Public-source certainty descriptor
moderate for group association; low for individual drugs
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
pregnancy
Comparator
untreated women or prepregnancy discontinuers
Effect or numbers carried forward

Adjusted GDM RR 1.8 (95% CI 1.3–2.4) versus untreated pregnancies and 1.6 (1.2–2.1) versus prepregnancy discontinuers; adjusted LGA RR 1.6 (1.3–1.9) and 1.3 (1.1–1.6), respectively.

Limitations

The high-metabolic-risk group combined clozapine, olanzapine, and quetiapine and could not separate agents; BMI and measured maternal factors were adjusted, but residual confounding and differential surveillance remain.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-037Provisional public source

ACOG recommends gestational-diabetes screening for pregnant patients using antipsychotics consistent with standard prenatal care.

Public-source certainty descriptor
guideline recommendation
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
pregnancy
Comparator
standard prenatal care
Effect or numbers carried forward

No special early-screening effect estimate established

Limitations

Evidence linking exposure to GDM is heterogeneous and confounded.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-038Provisional public source

Neonatal EPS or withdrawal/adaptation signs have been reported after third-trimester antipsychotic exposure.

Public-source certainty descriptor
regulatory class warning; absolute risk unknown
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
third trimester/near delivery
Comparator
no late antipsychotic exposure
Effect or numbers carried forward

Reported signs include agitation, hypertonia or hypotonia, tremor, somnolence, respiratory distress, and feeding disorder; severity and duration vary, and no reliable incidence is available.

Limitations

Spontaneous reports, co-medications, illness severity, and no reliable denominator; Cobenfy is mechanistically distinct and excluded from this class claim.

Sources, citation controls, and verification state

Linked sources

PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-041Evidence gap

Clozapine reproductive evidence is too sparse for a reliable malformation estimate, while maternal metabolic and hematologic risks require active management.

Public-source certainty descriptor
very low for fetal estimates; established maternal adverse-effect profile
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
pregnancy
Comparator
other antipsychotics or no exposure
Effect or numbers carried forward

Case reports/series and small cohorts; no precise comparative RR

Limitations

Extreme confounding by treatment resistance and publication bias.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-042Provisional public source

Clozapine is generally avoided during breastfeeding because infant data include sedation and possible agranulocytosis.

Public-source certainty descriptor
very low—few case reports but high-severity potential
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
lactation
Comparator
no breast-milk exposure
Effect or numbers carried forward

Among four reported breastfed infants summarized by LactMed, one had drowsiness and one possible agranulocytosis

Limitations

Tiny denominator, uncertain causality, and reporting bias.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-063Provisional public source

A stable patient should not be switched reflexively after conception solely to use a medicine with more pregnancy data.

Public-source certainty descriptor
guideline recommendation
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
after conception
Comparator
continuing an effective regimen
Effect or numbers carried forward

No single effect estimate; relapse and fetal polypharmacy tradeoff

Limitations

Important exceptions include valproate and compelling toxicity/ineffectiveness; individual history controls the decision.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending
B-064Provisional public source

If an antipsychotic was effective throughout pregnancy, routine postpartum switching solely for lactation is usually discouraged.

Public-source certainty descriptor
guideline recommendation
Formal appraisal
Not started — full text and independent appraisal pending
Exposure window
postpartum/lactation
Comparator
switching to a different agent
Effect or numbers carried forward

No single effect estimate

Limitations

Clozapine, milk-supply goals with aripiprazole, infant prematurity/illness, and long-lived/LAI exposure may change the decision.

Sources, citation controls, and verification state
PMID
Not populated in v0.95
DOI
Pending DOI verification
Exact locator
Pending exact table/figure/page/supplement locator
Access date
2026-07-29
Integrity check
Same-day source surveillance recorded; source-by-source correction/retraction verification remains pending
Internal verification
Source-linked; independent external verification pending