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Mandatory vs Permissive Substitution: How State Laws Control Generic Drug Switching

Mandatory vs Permissive Substitution: How State Laws Control Generic Drug Switching

  • by Colin Edward Egan
  • on 13 Mar 2026

State laws determine whether pharmacists must or can swap brand-name drugs for generics. Mandatory substitution cuts costs and improves adherence; permissive rules with consent requirements often block savings. The difference can mean thousands in out-of-pocket costs.