A large US/Nordic cohort found no malformation increase with prescribed amphetamines after adjustment and a possible small cardiac-malformation increase with methylphenidate.
- Public-source certainty descriptor
- moderate for no large amphetamine effect; low-to-moderate for small methylphenidate cardiac signal; not GRADE
- Formal appraisal
- Not started — full text and independent appraisal pending
- Exposure window
- first trimester
- Comparator
- stimulant exposed versus unexposed
US methylphenidate n=2,072: any-malformation RR 1.11 (0.91-1.35), cardiac RR 1.28 (0.94-1.74); amphetamine n=5,571: any RR 1.05 (0.93-1.19), cardiac RR 0.96 (0.78-1.19); pooled methylphenidate cardiac RR 1.28 (1.00-1.64), about 3 additional per 1,000 if causal.
Dispensing exposure, live births, residual confounding, and limited formulation-specific evidence; prescription methamphetamine not distinctly characterized.
Sources, citation controls, and verification state
Linked sources
- adjusted multinational cohort; causal and exposure-boundary statementEXT-035 · Not formally appraised
- 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