2022 IL App (1st) 210478
Ill. App. Ct.2022Background
- C.M. was born in 2006 with spina bifida and other congenital defects; plaintiffs (Charles and Angie Muhammad) allege in utero exposure to Depakote (valproate) caused the injuries.
- Angie Muhammad was prescribed Depakote in May 2005; physicians knew Depakote carried a 1–2% reported risk of spina bifida (PDR/package insert) and advised she use birth control; she later became pregnant and Depakote was stopped in October 2005.
- The Muhammads sued Northwestern (the treating psychiatrists/hospital); at an August 2018 jury trial they obtained an $18.5 million verdict based on allegations the physicians should have stopped Depakote when pregnancy risk/contraception unreliability was apparent.
- The Muhammads filed, dismissed, and later refiled suit against Abbott (Depakote’s manufacturer), alleging failure to warn—specifically that Abbott knew of studies (2004) showing substantially higher birth‑defect risks (reported as ~8–17%) than disclosed.
- Abbott moved for summary judgment, arguing judicial estoppel barred the Abbott suit because the plaintiffs allegedly took an inconsistent position in the Northwestern case, and also arguing lack of proximate cause because the treating doctors testified additional warnings would not have changed their prescribing.
- The trial court granted summary judgment for Abbott on judicial‑estoppel grounds; the appellate court reversed, holding the plaintiffs’ positions were compatible and genuine issues of material fact on causation and adequacy of warnings remained.
Issues
| Issue | Plaintiff's Argument (Muhammad) | Defendant's Argument (Abbott) | Held |
|---|---|---|---|
| Whether judicial estoppel bars the Abbott failure‑to‑warn suit | Plaintiffs maintained Northwestern’s physicians were negligent for continuing Depakote when contraception was unreliable; they may still claim Abbott’s inadequate warnings were an independent cause | Abbott: plaintiffs previously argued physicians had adequate knowledge of risks and therefore blamed only the doctors; plaintiffs’ current claim that Abbott failed to warn is factually inconsistent | Court: No estoppel — positions are compatible because both Abbott’s inadequate warnings and the physicians’ negligence can be proximate causes; estoppel not shown by clear and convincing evidence |
| Whether Abbott’s warnings were inadequate / risks were widely known | Plaintiffs: discovery reveals Abbott knew of higher risk data (2004) not disclosed; a genuine fact issue exists whether the medical community lacked that information and warnings were inadequate | Abbott: PDR/insert disclosed the spina bifida risk (1–2%); physicians testified they knew these warnings, so risk was widely known and warnings adequate | Court: Reversed summary judgment — Dr. Nasr’s affidavit and documents create factual dispute about whether Abbott withheld higher‑risk data and whether warnings were adequate; jury question |
| Whether Abbott’s failure to warn was proximate cause given physicians’ testimony | Plaintiffs: expert Dr. Nasr opined that disclosure of higher risks (10–17%) would have led standard‑of‑care psychiatrists not to prescribe Depakote to Angie, so Abbott’s failure to warn is a but‑for/material factor | Abbott: treating doctors testified they would have prescribed Depakote regardless of higher risk disclosures (they relied on contraception), so no causal link to Abbott | Held: Credibility/conflict of expert testimony creates genuine issue of material fact; physicians’ self‑reports are not dispositive — causation is for the jury, not summary judgment |
Key Cases Cited
- New Hampshire v. Maine, 532 U.S. 742 (2001) (describing judicial estoppel’s purpose to protect integrity of the judicial process)
- Seymour v. Collins, 2015 IL 118432 (2015) ( Illinois standard and prerequisites for invoking judicial estoppel)
- Kirk v. Michael Reese Hosp. & Med. Ctr., 117 Ill. 2d 507 (1987) (learned intermediary doctrine: manufacturers must warn prescribing physicians)
- Hansen v. Baxter Healthcare Corp., 198 Ill. 2d 420 (2002) (physicians not learned intermediaries if they were not sufficiently warned)
- Mahr v. G.D. Searle & Co., 72 Ill. App. 3d 540 (1979) (physician malpractice does not necessarily absolve drug manufacturer for failure to warn)
- Abrams v. City of Chicago, 211 Ill. 2d 251 (2004) (proximate‑cause standard: defendant’s conduct must be a material element and substantial factor)
- Carney v. Union Pacific R.R. Co., 2016 IL 118984 (2016) (summary judgment de novo review standard)