Learn why doctors mark prescriptions 'Do Not Substitute' and when brand-name drugs are truly necessary. Discover the cost differences, legal rules, and how to save money on your meds.
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Twenty-seven U.S. states have special rules blocking or restricting generic substitution for narrow therapeutic index drugs like warfarin and levothyroxine. Learn which states restrict swaps, why they exist, and how they affect patients and pharmacies.
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