substitution for "narrow therapeutic index" (NTI) drugs

    The new generic warfarin is raising a big controversy about substitution for "narrow therapeutic index" (NTI) drugs.

    It's true that some drugs have a narrow range between doses that are subpotent...and doses that are toxic. Warfarin is one.

    There are others...carbamazepine...digoxin...levothyroxine...phenytoin...theophylline.

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